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Special Issue "Exclusive Feature Papers in Colorants- 2nd Volume"

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A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Colorants".

Deadline for manuscript submissions: 31 March 2023 | Viewed by 2745

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Prof. Dr. Lucia Panzella

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Department of Chemical Sciences, University of Naples “Federico II”, Via Cintia 4, I-80126 Naples, Italy
Interests: structural characterization, extraction and evaluation/modulation of the antioxidant properties of natural phenolic compounds with particular reference to: a) exploitation of phenolic compounds especially from agri-food by-products for the development of functional materials to be used in cosmetics, food packaging and biomedicine; b) reactivity of natural phenolic compounds with reactive oxygen and nitrogen species and their manipulation/derivatization to improve their functional properties; c) evaluation of the antioxidant properties of phenolic compounds and of complex extracts/matrices by validated chemical assays; d) chemistry of melanin pigments
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Special Issue Information

Dear Colleagues,

We are pleased to announce the Special Issue entitled “Exclusive Feature Papers in Colorants-2nd Volume.” This is a collection of important high-quality papers (original research articles or comprehensive review papers) published in open access format by Editorial Board Members or prominent scholars invited by the Editorial Office and the Guest Editors. This Special Issue aims to discuss new knowledge or new cutting-edge developments in the colorants research field through selected works, in the hope of making a great contribution to the community. We intend for this Special Issue to be the best forum for disseminating excellent research findings as well as sharing innovative ideas in the field.

Prof. Dr. Lucia Panzella
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2300 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (4 papers)

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Research

Open AccessArticle

Effects of Different Lengths of Oligo (Ethylene Glycol) Side Chains on the Electrochromic and Photovoltaic Properties of Benzothiadiazole-Based Donor-Acceptor Conjugated Polymers

and

Molecules 2023, 28(5), 2056; https://doi.org/10.3390/molecules28052056 - 22 Feb 2023

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Abstract

In recent years, donor-acceptor (D-A)-type conjugated polymers have been widely used in the field of organic solar cells (OSCs) and electrochromism (EC). Considering the poor solubility of D-A conjugated polymers, the solvents used in material processing and related device preparation are mostly toxic halogenated solvents, which have become the biggest obstacle to the future commercial process of the OSC and EC field. Herein, we designed and synthesized three novel D-A conjugated polymers, PBDT1-DTBF, PBDT2-DTBF, and PBDT3-DTBF, by introducing polar oligo (ethylene glycol) (OEG) side chains of different lengths in the donor unit benzodithiophene (BDT) as side chain modification. Studies on solubility, optics, electrochemical, photovoltaic and electrochromic properties are conducted, and the influence of the introduction of OEG side chains on its basic properties is also discussed. Studies on solubility and electrochromic properties show unusual trends that need further research. However, since PBDT-DTBF-class polymers and acceptor IT-4F failed to form proper morphology under the low-boiling point solvent THF solvent processing, the photovoltaic performance of prepared devices is not ideal. However, films with THF as processing solvent showed relatively desirable electrochromic properties and films cast from THF display higher CE than CB as the solvent. Therefore, this class of polymers has application feasibility for green solvent processing in the OSC and EC fields. The research provides an idea for the design of green solvent-processable polymer solar cell materials in the future and a meaningful exploration of the application of green solvents in the field of electrochromism. Full article

(This article belongs to the Special Issue Exclusive Feature Papers in Colorants- 2nd Volume)

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Open AccessArticle

HPLC Study of Product Formed in the Reaction of NBD-Derived Fluorescent Probe with Hydrogen Sulfide, Cysteine, N-acetylcysteine, and Glutathione

Daniel Słowiński

Małgorzata Świerczyńska

Jarosław Romański

and

Radosław Podsiadły

Molecules 2022, 27(23), 8305; https://doi.org/10.3390/molecules27238305 - 28 Nov 2022

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Abstract

Hydrogen sulfide (H₂S) and its bioderivatives analogs, such as L-cysteine (L-Cys) and glutathione (GSH), are ubiquitous biological thiols in the physiological and pathological processes of living systems. Their aberrant concentration levels are associated with many diseases. Although several NBD-based fluorescence probes have been developed to detect biological thiols, the HPLC-detection of H₂S, GSH, L-Cys, and N-acetylcysteine-specific products has not been described. Herein, a novel NBD-derived pro-coumarin probe has been synthesized and used to develop a new strategy for the triple mode detection of H₂S and such thiols as GSH, L-Cys, and NAC. Hydrogen sulfide and those biothiols at physiological pH release fluorescent coumarin from the probe and cause a significant fluorescence enhancement at 473 nm. The appropriate NBD-derived product for H₂S, L-Cys, GSH, and NAC has a different color and retention time that allows distinguishing these biological thiols meaning the probe has a great possibility in the biological application. Fluorescent imaging combined with colorimetric and HPLC detection of H₂S/biothiol-specific product(s) brings a potential tool for confirming the presence of biological thiols and determining concentrations in various aqueous biological samples. Full article

(This article belongs to the Special Issue Exclusive Feature Papers in Colorants- 2nd Volume)

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Open AccessArticle

Novel Yellow Azo Pyridone Derivatives with Different Halide Atoms for Image-Sensor Color Filters

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Molecules 2022, 27(19), 6601; https://doi.org/10.3390/molecules27196601 - 05 Oct 2022

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Abstract

Novel yellow azo pyridone dye derivatives were synthesized for use in image-sensor color filters. The synthesized compounds have a basic chemical structure composed of azo, hydroxy, amide, and nitrile groups as well as different halide groups. New materials were evaluated on the basis of their optical, thermal, and surface properties under conditions mimicking those of a commercial device fabrication process. A comparison of their related performance revealed that, among the four prepared compounds, 5-((4,6-dichlorocyclohexa-2,4-dien-1-yl)diazenyl)-6-hydroxy-1,4-dimethyl-2-oxo-1,2-dihydropyridine-3-carbonitrile (Cl-PAMOPC) exhibited the best performance as an image-sensor color filter material, including a solubility greater than 0.1 wt% in propylene glycol monomethyl ether acetate solvent, a high decomposition temperature of 263 °C, and stable color difference values of 4.93 and 3.88 after a thermal treatment and a solvent-resistance test, respectively. The results suggest that Cl-PAMOPC can be used as a green dye additive in an image-sensor colorant. Full article

(This article belongs to the Special Issue Exclusive Feature Papers in Colorants- 2nd Volume)

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Open AccessArticle

A Straightforward Access to New Amides of the Melanin Precursor 5,6-Dihydroxyindole-2-carboxylic Acid and Characterization of the Properties of the Pigments Thereof

Rita Argenziano

Marina Della Greca

Lucia Panzella

and

Alessandra Napolitano

Molecules 2022, 27(15), 4816; https://doi.org/10.3390/molecules27154816 - 27 Jul 2022

Cited by 1 | Viewed by 730

Abstract

We report herein an optimized procedure for preparation of carboxamides of 5,6-dihydroxyindole-2-carboxylic acid (DHICA), the main biosynthetic precursor of the skin photoprotective agents melanins, to get access to pigments with more favorable solubility properties with respect to the natural ones. The developed procedure was based on the use of a coupling agent (HATU/DIPEA) and required protection of the catechol function by easily removable acetyl groups. The O-acetylated compounds could be safely stored and taken to the reactive o-diphenol form just before use. Satisfactorily high yields (>85%) were obtained for all amides. The oxidative polymerization of the synthesized amides carried out in air in aqueous buffer at pH 9 afforded melanin-like pigmented materials that showed chromophores resembling those of DHICA-derived pigments, with a good covering of the UVA and the visible region, and additionally exhibited a good solubility in alcoholic solvents, a feature of great interest for the exploitation of these materials as ingredients of dermocosmetic formulations. Full article

(This article belongs to the Special Issue Exclusive Feature Papers in Colorants- 2nd Volume)

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