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Journal = Chemistry
Section = Supramolecular Chemistry

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16 pages, 3436 KiB  
Article
Synthesis and Characterization of Polymethylhydrosiloxane-Modified Phenol–Formaldehyde Resin
by Luong Nhu Hai, Nguyen Van Thao, Pham The Long, Nguyen Xuan Anh, Le Tran Tiep, Hoang Quoc Nam, Nguyen Minh Viet, Tran The Dinh, Le Duy Binh, Ta Kim Thanh Hien and Cong Tien Dung
Chemistry 2025, 7(4), 112; https://doi.org/10.3390/chemistry7040112 - 7 Jul 2025
Viewed by 483
Abstract
Resol phenol–formaldehyde (PF) resin was modified with 2.5 and 5.0 wt% polymethylhydrosiloxane (PMHS). This study characterizes the modified resin and its subsequently fabricated glass fiber (GF)-reinforced composites (30–60 wt% GF). Formation of an organic–inorganic hybrid network, via reaction between Si-H groups of PMHS [...] Read more.
Resol phenol–formaldehyde (PF) resin was modified with 2.5 and 5.0 wt% polymethylhydrosiloxane (PMHS). This study characterizes the modified resin and its subsequently fabricated glass fiber (GF)-reinforced composites (30–60 wt% GF). Formation of an organic–inorganic hybrid network, via reaction between Si-H groups of PMHS and hydroxyl (-OH) groups of the resol resin, was confirmed by FTIR and 1H NMR. DSC and TGA/DTG revealed enhanced thermal stability for PMHS-modified resin: the decomposition temperature of Resol–PMHS 5.0% increased to 483 °C (neat resin: 438 °C), and char yield at 800 °C rose to 57% (neat resin: 38%). The 60 wt% GF-reinforced Resol–PMHS 5.0% composite exhibited tensile, flexural, and impact strengths of 145 ± 7 MPa, 160 ± 7 MPa, and 71 ± 5 kJ/m2, respectively, superior to the unmodified resin composite (136 ± 6 MPa, 112 ± 6 MPa, and 51 ± 5 kJ/m2). SEM observations indicated improved fiber–matrix interfacial adhesion and reduced delamination. These results demonstrate that PMHS modification effectively enhances the thermo-mechanical properties of the PF resin and its composites, highlighting potential for industrial applications. Full article
(This article belongs to the Section Supramolecular Chemistry)
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11 pages, 3231 KiB  
Article
A Nitrogen-Rich Luminescent Zn(II) Coordination Polymer Based on a 2,4,6-Tris(di-2-pyridylamino)-1,3,5-triazine for Differential Fluorescent Sensing of Antibiotics in Aqueous Medium
by Sajeetha Parveen Banu, Mannanthara Kunhumon Noushija, Binduja Mohan and Sankarasekaran Shanmugaraju
Chemistry 2025, 7(4), 108; https://doi.org/10.3390/chemistry7040108 - 25 Jun 2025
Viewed by 517
Abstract
The design of suitable chemosensors for environmental pollutants and toxins detection at trace levels remains a critical area of research. Among various chemosensors, Zn(II) coordination polymers have garnered special interest as fluorescent probes for environmental applications. In this article, we report the synthesis [...] Read more.
The design of suitable chemosensors for environmental pollutants and toxins detection at trace levels remains a critical area of research. Among various chemosensors, Zn(II) coordination polymers have garnered special interest as fluorescent probes for environmental applications. In this article, we report the synthesis of a nitrogen-rich luminescent Zn(II) coordination polymer, TDPAT-Zn-CP, designed for differential fluorescent sensing of antibiotics in an aqueous medium. TDPAT-Zn-CP was synthesized using a star-shaped 2,4,6-tris(di-2-pyridylamino)-1,3,5-triazine (TDPAT) fluorophore, a promising blue-emitting compound. The morphological and structural properties of TDPAT-Zn-CP were thoroughly analyzed using conventional spectroscopic and analytical techniques. The fluorescence titration studies in aqueous medium demonstrated that TDPAT-Zn-CP exhibits remarkable selectivity, sensitivity, and differential fluorescence sensing responses towards various antibiotics. Among the antibiotics tested, TDPAT-Zn-CP displayed a significant fluorescence quenching and high selectivity for sulfamethazine (SMZ), with a Stern–Volmer quenching constant of KSV = 1.68 × 104 M−1 and an impressive sensitivity of 4.95 ppb. These results highlight the potential of TDPAT-Zn-CP as a practically useful, highly effective polymeric sensor for the differential fluorescence-based detection of antibiotics in water, offering a promising approach for environmental monitoring and contamination control. Full article
(This article belongs to the Section Supramolecular Chemistry)
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12 pages, 1967 KiB  
Article
Cholesteric Liquid Crystal Polymer Network Patterns with a Golden Structural Color
by Qingyan Zeng, Wei Liu, Yi Li and Yonggang Yang
Chemistry 2025, 7(3), 93; https://doi.org/10.3390/chemistry7030093 - 3 Jun 2025
Viewed by 557
Abstract
Cholesteric liquid crystal polymer network (CLCN) films with composite structural colors have potential applications in decoration and anti-counterfeiting. Herein, a thermochromic acrylate-based cholesteric liquid crystal mixture was prepared. The structural color of CLCN films can be controlled by the photopolymerization temperature. Based on [...] Read more.
Cholesteric liquid crystal polymer network (CLCN) films with composite structural colors have potential applications in decoration and anti-counterfeiting. Herein, a thermochromic acrylate-based cholesteric liquid crystal mixture was prepared. The structural color of CLCN films can be controlled by the photopolymerization temperature. Based on the oxygen inhibition of the acrylate group, CLCN films with double reflection bands were prepared using a two-step photopolymerization method. The distance between these two reflection bands was controlled by the polymerization temperatures of these two steps. Since golden colors are the most attractive for decoration, herein, colorful patterns with a golden structural color were prepared by controlling the polymerization temperatures. Full article
(This article belongs to the Section Supramolecular Chemistry)
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16 pages, 3212 KiB  
Article
Synthesis, Characterization and Structural Study of the Two Ionic Hydrogen-Bonded Organic Frameworks Based on Sterically Crowded Bifunctional Moieties
by Kira E. Vostrikova, Vladimir P. Kirin and Denis G. Samsonenko
Chemistry 2024, 6(5), 1271-1286; https://doi.org/10.3390/chemistry6050073 - 16 Oct 2024
Viewed by 1311
Abstract
Small bifunctional molecules are attractive for use as models in different areas of knowledge. How can their functional groups interact in solids? This is important to know for the prediction of the physical and chemical properties of the materials based on them. In [...] Read more.
Small bifunctional molecules are attractive for use as models in different areas of knowledge. How can their functional groups interact in solids? This is important to know for the prediction of the physical and chemical properties of the materials based on them. In this study, two new hydrogen-bonded organic frameworks (HOFs) based on sterically demanding molecular compounds, bis(1-hydroxy-2-methylpropane-2-aminium) sulfate (1) and 2-methyl-4-oxopentan-2-aminium hydrogen ethanedioate hydrate (2), were synthesized and fully characterized by means of FTIR and NMR spectroscopies, as well as by X-ray powder diffraction and thermogravimetric analyses. Their molecular and crystal structures were established through single-crystal X-ray diffraction analysis. It was shown that both compounds have a layered structure due to the formation of a 2D hydrogen-bonding network, the layers being linked by systematically arranged Van der Waals contacts between the methyl groups of organic cations. To unveil some dependencies between the chemical nature of bifunctional molecules and their solid structure, Hirschfeld surface (HS) analysis was carried out for HOFs 1, 2, and their known congeners 1-hydroxy-2-methylpropan-2-aminium hemicarbonate (3) and 1-hydroxy-2-methylpropan-2-aminium (1-hydroxy-2-methylpropan-2-yl) carbamate (4). HS was performed to quantify and visualize the close intermolecular atomic contacts in the crystal structures. It is clearly seen that H–H contacts make the highest contributions to the amino alcohol based compounds 1, 3 and 4, with a maximal value of 65.2% for compound 3 having CO32− as a counterion. A slightly lower contribution of H–H contacts (64.4%) was found for compound 4, in which the anionic part is represented by 1-hydroxy-2-methylpropan-2-yl carbamate. The significant contribution of the H–H contacts in the bifunctional moieties is due to the presence of a quaternary carbon atom with a short three-carbon chain. Full article
(This article belongs to the Section Supramolecular Chemistry)
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11 pages, 3030 KiB  
Article
Vapor-Driven Crosslinked Hydroxypropyl-β-Cyclodextrin Electrospun Nanofibrous Membranes for Ultrafast Dye Removal
by Xinmiao Xu, Yi Zhang, Yong Chen and Yu Liu
Chemistry 2024, 6(4), 506-516; https://doi.org/10.3390/chemistry6040029 - 25 Jun 2024
Viewed by 1283
Abstract
Traditional separation membranes used for dye removal often suffer from a trade-off between separation efficiency and water permeability. Herein, we propose a facile approach to prepare cyclodextrin-based high-flux nanofiber membranes by electrospinning and vapor-driven crosslinking processes. The application of glutaraldehyde vapor for crosslinking [...] Read more.
Traditional separation membranes used for dye removal often suffer from a trade-off between separation efficiency and water permeability. Herein, we propose a facile approach to prepare cyclodextrin-based high-flux nanofiber membranes by electrospinning and vapor-driven crosslinking processes. The application of glutaraldehyde vapor for crosslinking hydroxypropyl-β-cyclodextrin (HP-β-CD)/polyvinyl alcohol (PVA)/laponite electrospun membranes can build interconnected structures and lead to the formation of a porous hierarchical layer. In addition, the incorporation of inorganic salt, laponite, can alter the crosslinking process, resulting in membranes with improved hydrophilicity and highly maintained electrospun nanofibrous morphology, which contributes to an ultrafast water flux of 1.0 × 105 Lh−1m−2bar−1. Due to the synergetic effect of strong host–guest interaction and electrostatic interaction, the membranes exhibit suitable rejection toward anionic dyes with a high removal efficiency of >99% within a short time and achieve accurate separation for cationic against anionic dyes, accompanied by suitable recyclability with >97% separation efficiency after at least four separation–regenerations. The prepared membranes with remarkable separation efficiency and ultrafast permeation properties might be a promising candidate for high-performance membranes in water treatment. Full article
(This article belongs to the Section Supramolecular Chemistry)
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12 pages, 5266 KiB  
Article
Differential Fluorescent Chemosensing of Antibiotics Using a Luminescent Zn(II) Coordination Polymer Based on a 4-Amino-1,8-naphthalimide Tröger’s Base Fluorophore
by Purti Patel, Mannanthara Kunhumon Noushija and Sankarasekaran Shanmugaraju
Chemistry 2024, 6(1), 237-248; https://doi.org/10.3390/chemistry6010011 - 7 Feb 2024
Cited by 4 | Viewed by 2351
Abstract
The design and development of useful chemosensors for the ultra-trace detection of environmental pollutants and contaminants is a topical area of research. Herein, we report a new nanoscale emissive Zn(II) coordination polymer (TB-Zn-CP) for differential fluorescence sensing of various antibiotics in [...] Read more.
The design and development of useful chemosensors for the ultra-trace detection of environmental pollutants and contaminants is a topical area of research. Herein, we report a new nanoscale emissive Zn(II) coordination polymer (TB-Zn-CP) for differential fluorescence sensing of various antibiotics in water. TB-Zn-CP was synthesized using a unique V-shaped green emitting 4-amino-1,8-naphthalimide Tröger’s base (TBNap) fluorophore. The structural and morphological features of TB-Zn-CP were characterized by various standard spectroscopic and microscopy techniques. The fluorescence titration studies in water demonstrated a remarkable sensitivity and differential fluorescence sensing properties of TB-Zn-CP for the fast detection of different antibiotics. Among different antibiotics, chloramphenicol (CRP), 1,2-dimethyl-5-nitroimidazole (DMZ), and sulfamethazine (SMZ) displayed the highest fluorescence-quenching efficiency and superior sensitivity in their detection. The differential sensing capability of TB-Zn-CP was also indicated by visualizable color changes. The Stern–Volmer quenching constant KSV was determined to be in the order of 103–104 M−1, and the sensitivity was shown to be at a nanomolar (10−9 M) level. All these results confirm that TB-Zn-CP can be a potential and practically useful polymeric sensor for differential fluorescence and visual detection of different antibiotics in water. Full article
(This article belongs to the Section Supramolecular Chemistry)
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11 pages, 2061 KiB  
Article
New Polymorph of β-Cyclodextrin with a Higher Bioavailability
by Askar K. Gatiatulin, Ilya S. Balakhontsev, Sofia M. Talashmanova, Marat A. Ziganshin and Valery V. Gorbatchuk
Chemistry 2024, 6(1), 51-61; https://doi.org/10.3390/chemistry6010003 - 23 Dec 2023
Cited by 2 | Viewed by 2161
Abstract
A new polymorph of anhydrous β-cyclodextrin (polymorph III) was obtained and characterized for the first time using powder X-ray diffraction, infrared spectroscopy, and thermal analysis. The solution enthalpy and time of dissolution in water were determined using solution calorimetry for this polymorph and [...] Read more.
A new polymorph of anhydrous β-cyclodextrin (polymorph III) was obtained and characterized for the first time using powder X-ray diffraction, infrared spectroscopy, and thermal analysis. The solution enthalpy and time of dissolution in water were determined using solution calorimetry for this polymorph and compared with those of the dried commercial form of β-cyclodextrin (polymorph I), its amorphous form, and 2-hydroxypropyl-β-cyclodextrin. The specific heat capacities of polymorphs I and III were determined using differential scanning calorimetry across a wide range of temperatures, providing enthalpy and Gibbs energy values for the polymorphic transition at 298 K. The affinities of polymorph III and 2-hydroxypropyl-β-cyclodextrin for water were characterized by determining their hydration isotherms, which provided values of hydration Gibbs energy. Being energy-rich, the new-found polymorph of β-cyclodextrin has a significantly higher dissolution rate and an increased affinity for water compared with the dried commercial form of β-cyclodextrin. These properties render the new polymorph promising in industrial applications for guest inclusion in aqueous solutions and pastes, and may be a desirable alternative for water-soluble β-cyclodextrin derivatives. Full article
(This article belongs to the Section Supramolecular Chemistry)
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13 pages, 3781 KiB  
Article
Tweaking of Peripheral Moieties in Catalytic Amyloid for Modulating Hydrogel Strength and Hydrolase Activity
by Soumya Patra, Nimisha A. Mavlankar, Lakshminarayan Ramesan, Ashmeet Singh and Asish Pal
Chemistry 2023, 5(2), 1190-1202; https://doi.org/10.3390/chemistry5020080 - 10 May 2023
Cited by 3 | Viewed by 2821
Abstract
The de novo design and synthesis of peptide-based biocatalysts that can mimic the activity of natural enzymes is an exciting field with unique opportunities and challenges. In a natural enzyme, the active site is composed of an assembly of different amino acid residues, [...] Read more.
The de novo design and synthesis of peptide-based biocatalysts that can mimic the activity of natural enzymes is an exciting field with unique opportunities and challenges. In a natural enzyme, the active site is composed of an assembly of different amino acid residues, often coordinated with a metal ion. A metalloenzyme’s catalytic activity results from the dynamic and concerted interplay of various interactions among the residues and metal ions. Aiming to mimic such enzymes, simple peptide fragments, drawing structural inspiration from natural enzymes, can be utilized as a model. In our effort to mimic a metal-containing hydrolase, we designed peptide amphiphiles (PA) 1 and 2 with a terminal histidine having amide and acid functionalities, respectively, at its C-terminal, imparting differential ability to coordinate with Zn and Cu ions. The PAs demonstrate remarkable self-assembly behavior forming excellent nanofibers. Upon coordination with metal ions, depending on the coordination site the nanofibers become rigidified or weakened. Rheological studies revealed excellent mechanical properties of the hydrogels formed by the PAs and the PA–metal co-assemblies. Using such co-assemblies, we mimic hydrolase activity against a p-nitrophenyl acetate (p-NPA) substrate. Michaelis–Menten’s enzyme kinetic parameters indicated superior catalytic activity of 2 with Zn amongst all the assemblies. Full article
(This article belongs to the Special Issue Programmable and Stimulus-Responsive Supramolecular Assemblies)
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12 pages, 3309 KiB  
Article
Stimuli-Responsive Designer Supramolecular Polymer Gel
by M. Douzapau, Srayoshi Roy Chowdhury, Surajit Singh, Olamilekan Joseph Ibukun and Debasish Haldar
Chemistry 2023, 5(1), 691-702; https://doi.org/10.3390/chemistry5010048 - 22 Mar 2023
Cited by 3 | Viewed by 2993
Abstract
This paper reports a stimuli-responsive designer supramolecular polymer gel in dimethylsulphoxide (DMSO)/water (1:2) based on a dipeptide amphiphile and β-cyclodextrin (β-CD) The dipeptide amphiphile contains caproic acid at the N terminus and methyl ester at the C terminus. From X-ray single crystal diffraction, [...] Read more.
This paper reports a stimuli-responsive designer supramolecular polymer gel in dimethylsulphoxide (DMSO)/water (1:2) based on a dipeptide amphiphile and β-cyclodextrin (β-CD) The dipeptide amphiphile contains caproic acid at the N terminus and methyl ester at the C terminus. From X-ray single crystal diffraction, the amphiphile adopts a kink-like conformation. The amphiphile self-assembled to form a parallel sheet-like structure stabilized by multiple intermolecular hydrogen bonds. Moreover, the parallel sheet-like structure is also stabilized by edge-to-edge ππ stacking interactions. In higher-order packing, it forms a corrugated sheet-like structure stabilized by hydrophobic interactions. The dipeptide amphiphile interacts with β-cyclodextrin and forms gel through supramolecular polymer formation in (DMSO)/water (1:2) by a simple heating-cooling cycle. The sol-to-gel transformation is because of a host–guest complex between compound 1 and β-CD and the formation of supramolecular polymer accompanied by microstructure changes from nanofibers to microrods. The gel is temperature responsive with a Tgel of 70 °C. The supramolecular polymer gel is also responsive to stimuli such aspicric acid and HCl. The extensive spectroscopic studies show that the aromatic hydrophobic side chain of compound 1 forms a host–guest complex with β-CD. These results will be helpful for the design of advanced programable eco-friendly functional materials. Full article
(This article belongs to the Special Issue Programmable and Stimulus-Responsive Supramolecular Assemblies)
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13 pages, 4372 KiB  
Review
Anion-Complexation-Induced Emission Based on Aggregation-Induced Emission Fluorophore
by Dongxing Ren, Liangliang Zhang, Hongwei Qian and Tangxin Xiao
Chemistry 2023, 5(1), 242-254; https://doi.org/10.3390/chemistry5010019 - 7 Feb 2023
Cited by 5 | Viewed by 5457
Abstract
Aggregation-induced emission (AIE) materials have attracted increasing research interest in recent years due to their excellent fluorescence properties in an aggregated state. Concurrently, anion coordination interactions have played a key role in the development of supramolecular assemblies and sensors. In the past decade, [...] Read more.
Aggregation-induced emission (AIE) materials have attracted increasing research interest in recent years due to their excellent fluorescence properties in an aggregated state. Concurrently, anion coordination interactions have played a key role in the development of supramolecular assemblies and sensors. In the past decade, investigations towards fluorescent materials or sensors based on AIE and anion coordination interactions are continuously being reported. In this minireview, we briefly summarize the burgeoning progress of AIE-based materials and sensors driven by anion coordination interactions. We believe that an increasing number of achievements in anion-coordination induced emission materials will appear in the near future and will demonstrate potential applications, including bio-imaging and bio-sensors. Full article
(This article belongs to the Special Issue Supramolecular Anion Recognition: Principles and Applications)
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19 pages, 5039 KiB  
Review
Lewis Acidic Zinc(II) Complexes of Tetradentate Ligands as Building Blocks for Responsive Assembled Supramolecular Structures
by Ivan Pietro Oliveri and Santo Di Bella
Chemistry 2023, 5(1), 119-137; https://doi.org/10.3390/chemistry5010010 - 13 Jan 2023
Cited by 18 | Viewed by 4232
Abstract
This review presents representative examples illustrating how the Lewis acidic character of the Zn(II) metal center in Zn(salen)-type complexes, as well as in complexes of other tetradentate ligands, and the nature of the medium govern their supramolecular aggregation, leading to the formation of [...] Read more.
This review presents representative examples illustrating how the Lewis acidic character of the Zn(II) metal center in Zn(salen)-type complexes, as well as in complexes of other tetradentate ligands, and the nature of the medium govern their supramolecular aggregation, leading to the formation of a variety of supramolecular structures, either in solution or in the solid state. Stabilization of these Lewis acidic complexes is almost always reached through an axial coordination of a Lewis base, leading to a penta-coordinated square-pyramidal geometry around the metal center. The coverage is not exhaustive, mainly focused on their crystallographic structures, but also on their aggregation and sensing properties in solution, and on their self-assembled and responsive nanostructures, summarizing their salient aspects. The axial ligands can easily be displaced, either in solution or in the solid state, with suitable Lewis bases, thus being responsive supramolecular structures useful for sensing. This contribution represents the first attempt to relate some common features of the chemistry of different families of Zn(II) complexes of tetradentate ligands to their intrinsic Lewis acidic character. Full article
(This article belongs to the Special Issue Programmable and Stimulus-Responsive Supramolecular Assemblies)
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13 pages, 3816 KiB  
Review
Heteroditopic Rotaxanes and Catenanes for Ion Pair Recognition
by Steven J. Nicholson, Sean R. Barlow and Nicholas H. Evans
Chemistry 2023, 5(1), 106-118; https://doi.org/10.3390/chemistry5010009 - 12 Jan 2023
Cited by 6 | Viewed by 3028
Abstract
A review of heteroditopic interlocked molecules and their application as receptors for simple inorganic ion pair species. The review details the design and ion recognition properties of the rotaxane and catenane receptors, as well as highlighting some of the experimental challenges; hence, it [...] Read more.
A review of heteroditopic interlocked molecules and their application as receptors for simple inorganic ion pair species. The review details the design and ion recognition properties of the rotaxane and catenane receptors, as well as highlighting some of the experimental challenges; hence, it provides insight into possible future avenues of research in this youthful field. Full article
(This article belongs to the Special Issue Supramolecular Anion Recognition: Principles and Applications)
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18 pages, 4412 KiB  
Review
Complementarity and Preorganisation in the Assembly of Heterometallic–Organic Cages via the Metalloligand Approach—Recent Advances
by Feng Li and Leonard F. Lindoy
Chemistry 2022, 4(4), 1439-1456; https://doi.org/10.3390/chemistry4040095 - 7 Nov 2022
Cited by 7 | Viewed by 3000
Abstract
The design of new metallocage polyhedra towards pre-determined structures can offer both practical as well as intellectual challenges. In this mini-review we discuss a selection of recent examples in which the use of the metalloligand approach has been employed to overcome such challenges. [...] Read more.
The design of new metallocage polyhedra towards pre-determined structures can offer both practical as well as intellectual challenges. In this mini-review we discuss a selection of recent examples in which the use of the metalloligand approach has been employed to overcome such challenges. An attractive feature of this approach is its stepwise nature that lends itself to the design and rational synthesis of heterometallic metal–organic cages, with the latter often associated with enhanced functionality. Full article
(This article belongs to the Special Issue Metal-Organic Cages and Their Applications)
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12 pages, 3986 KiB  
Article
Self-Assembly and Gelation Study of Dipeptide Isomers with Norvaline and Phenylalanine
by Erica Scarel, Giovanni Pierri, Petr Rozhin, Simone Adorinni, Maurizio Polentarutti, Consiglia Tedesco and Silvia Marchesan
Chemistry 2022, 4(4), 1417-1428; https://doi.org/10.3390/chemistry4040093 - 2 Nov 2022
Cited by 2 | Viewed by 3296
Abstract
Dipeptides have emerged as attractive building blocks for supramolecular materials thanks to their low-cost, inherent biocompatibility, ease of preparation, and environmental friendliness as they do not persist in the environment. In particular, hydrophobic amino acids are ideal candidates for self-assembly in polar and [...] Read more.
Dipeptides have emerged as attractive building blocks for supramolecular materials thanks to their low-cost, inherent biocompatibility, ease of preparation, and environmental friendliness as they do not persist in the environment. In particular, hydrophobic amino acids are ideal candidates for self-assembly in polar and green solvents, as a certain level of hydrophobicity is required to favor their aggregation and reduce the peptide solubility. In this work, we analyzed the ability to self-assemble and the gel of dipeptides based on the amino acids norvaline (Nva) and phenylalanine (Phe), studying all their combinations and not yielding to enantiomers, which display the same physicochemical properties, and hence the same self-assembly behavior in achiral environments as those studied herein. A single-crystal X-ray diffraction of all the compounds revealed fine details over their molecular packing and non-covalent interactions. Full article
(This article belongs to the Section Supramolecular Chemistry)
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10 pages, 2869 KiB  
Communication
Selective Recognition and Reversible “Turn-Off” Fluorescence Sensing of Acetate (CH3COO) Anion at Ppb Level Using a Simple Quinizarin Fluorescent Dye
by Mannanthara Kunhumon Noushija, Ananthu Shanmughan, Binduja Mohan and Sankarasekaran Shanmugaraju
Chemistry 2022, 4(4), 1407-1416; https://doi.org/10.3390/chemistry4040092 - 29 Oct 2022
Cited by 8 | Viewed by 3188
Abstract
A simple and cost-effective optical sensing system based on quinizarin fluorescent dye (QZ) for the selective and reversible sensing of CH3COO anions is reported. The anion binding affinity of QZ towards different anions was monitored using electronic absorption [...] Read more.
A simple and cost-effective optical sensing system based on quinizarin fluorescent dye (QZ) for the selective and reversible sensing of CH3COO anions is reported. The anion binding affinity of QZ towards different anions was monitored using electronic absorption and fluorescence emission titration studies in DMSO. The UV-visible absorption spectrum of QZ showed a decrease in the intensity of the characteristic absorption peaks at λ = 280, 323, and 475 nm, while a new peak appeared at λ = 586 nm after the addition of CH3COO anions. Similarly, the initial strong emission intensity of QZ was attenuated following titration with CH3COO anions. Notably, similar titration using other anions, such as F, Cl, I, NO3, NO2−, and H2PO4-, caused no observable changes in both absorption and emission spectra. The selective sensing of CH3COO anions was also reflected by a sharp visual color change from bright green to faint green under room light. Further, the binding was found to be reversible, and this makes QZ a potential optical and colorimetric sensor for selective, reversible, and ppb-level detection of CH3COO anions in a DMSO medium. Full article
(This article belongs to the Special Issue Supramolecular Anion Recognition: Principles and Applications)
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