234 Results Found

The control of ligand-field splitting in iron (II) complexes is critical to slow down the metal-to-ligand charge transfer (MLCT)-excited states deactivation pathways. The gap between the metal-centered states is maximal when the coordination sphere o...

To develop single molecule magnets, a dinuclear complex [Dy₂(HOBQ)₄Cl₆] (1) was prepared from the reaction of DyCl₃ with benzo[h]quinolin-10-ol (HOBQ). Each Dy(III) ion shows a compressed octahedral geometry and the two Dy(III) ions in 1 are bridged...

The reaction of [Ni(L)]Cl₂·2H₂O (L = 3,14-dimethyl-2,6,13,17-tetraazatricyclo [14,4,0^1.18,0^7.12]docosane) with trans-1,2-cyclopentanedicarboxylic acid (H₂-cpdc) yields a 1D hydrogen-bonded infinite chain with formula [Ni(L)(H-cpdc^-)₂] (1). This compl...

In this study, a new bi-nuclear nickel complex [Ni₂HL₂(EtOH)₂](Cl)(EtOH) of a Schiff base ligand, 2-[3-[2-hydroxybenzylideneamino]propyliminomethyl]phenol, was synthesized and characterized using UV/Vis, IR, HRMS, and TGA/DTA analysis. The molecular...

The powder of the arene osmium(II) complex, [Os(II)(dpzm)(η⁶-p-cym)Cl]BF₄ (dpzm = di(1H-pyrazol-1-yl)methane; η⁶-p-cym = para-cymene), with a formula of C₁₇H₂₂BClF₄N₄Os (referred to herein as 1) was isolated from the reaction of [(η⁶-p-cy...

Two novel 3D cadmium(II) cyanide coordination polymers with branched-butoxyethanol compounds (iBucel = iso-butoxyethanol, tBucel = tert-butoxyethanol), [{Cd(CN)₂(iBucel)₂}{Cd(CN)₂(H₂O)(iBucel)}₂{Cd(CN)₂}₆∙2(iBucel)]_n I and [{Cd(CN)₂(H₂O)_1.06(tBucel)₀...

Octahedral nickel(II) complexes are among the simplest systems that exhibit zero-field splitting by having two unpaired electrons. For the purpose of clarifying the relationship between structure and zero-field splitting in a low-symmetric system, di...

We report on the synthesis and the characterization of a novel cobalt trimesate metal-organic framework, designated as KCL-102. Powder X-ray diffraction pattern of KCL-102 is dominated by a reflection at 10.2° (d-spacing = 8.7 Å), while diffuse refle...

The Cu²⁺, Mn²⁺, and Fe³⁺ complexes of a 14 membered macrocycle were synthesized and their antioxidant capacities were evaluated against ABTS and DPPH radicals, with the objective of collecting insights into the biomimetic role of the central metal io...

The increasing incidence of community- and hospital-acquired infections with multidrug-resistant (MDR) bacteria poses a critical threat to public health and the healthcare system. Although β-lactam antibiotics are effective against most bacteria...

Redox-active manganese, iron, and nickel complexes of pyridin-2-ylsulfonyl-quinolin-8-yl-amide (psq) provide information for assessing the electronic and structural properties of this new tridentate ligand. Single-crystal X-ray structures show that p...

Two new Co(II) complexes, [{Co(L)}₂{Co(Pic)₂(CH₃OH)₂}] (1) and [{CoL(μ-OAc)}₂Co] (2), where H₂L = 2,2′-[Ethylenedioxybis(nitrilomethylidyne)]dinaphthol, were designed, synthesized and characterized by elemental analysis, FT-IR spectra, UV-Vis spectra...

A series of boron, aluminum, gallium, and indium chelates containing the underexplored bis(phenolate) aza-dipyrromethene (aza-DIPY) core were prepared. These compounds were found to possess near-infrared absorption and emission profiles in the 710 to...

Four Ni–phen complexes were prepared and characterized by FTIR and thermal analysis. The X-ray structure determination shows that the geometry around Ni^II ions in complexes 1, [Ni(phen)₂(H₂O)(ONO₂)](NO₃); 2, [Ni(phen)₂(H₂O)Cl]Cl; 3, [Ni(phen)(C...

Two mononuclear octahedral Co(II) complexes, [Co(L)X₂] (L = 1-(prop-2-en-1-yl)-1H-imidazole, X = NCS⁻ (1) and NCSe⁻ (2)), have been synthesized and characterized. The central Co(II) ions in two complexes adopt an octahedral geometry, coor...

The crystal and molecular structure of the title compound,C₂₄H₃₆CoN₁₀O₄·2(NO₃)·3(H₂O)·Cl, have been determined by X-ray analysis: Cc (No: 9),a = 17.6920(4) å, b = 11.8163(2) å, c = 16.4752(4) å, ß = 91.679(1)°, Z = 4. The Co(III)ion is six-coordinate...

Laser irradiation of metals is widely used in research and applications. In this work, we study how the material geometry affects electron–phonon coupling in nano-sized gold samples: an ultrathin layer, nano-rod, and two types of gold nanoparti...

A new double-open-cubane core Cd(II)-O-Cu(II) bimetallic ligand mixed cluster of type [Cl₂Cu₄Cd₂(NNO)₆(NN)₂(NO₃)₂].CH₃CN was made available in EtOH/CH₃CN solution. The 1-hydroxymethyl-3,5-dimethylpyrazole (NNOH) and 3,5-dimethylpyrazole (NNH) act as...

Ectoine is a chemical chaperone synthesised and used by bacteria to defend against osmotic stress. Although it has already gained attention from the pharmaceutical and cosmetic industries, thanks to its hydrating and cell-protecting properties, the r...

Two new cobalt(II) complexes with an unsymmetrical bidentate ligand, 2-(1,4,5,6-tetrahydropyrimidin-2-yl)-6-methoxyphenol (H₂mthp), were synthesized and crystallographically characterized. Tetra- and hexa-coordinate mononuclear complexes were selecti...

A novel family of tetraaza macrocyclic Cu(II) complexes [CuLX₂] (where L = N₄ donor macrocyclic ligands) and (X = Cl⁻, NO₃⁻) have been synthesized and characterized by elemental analysis, magnetic moments, IR, EPR, mass, electronic spectra and therma...

The salan zirconium complex of formula [(H₂N₂O₂)ZrCl₂] (H₂N₂O₂H₂ = HOPh’CH₂NH(CH₂)₂NHCH₂Ph’OH, where Ph’ = 2,4-(CMe₂Ph)C₆H₂) was synthesized and fully characterized by NMR and single-crystal X-ray diffraction. The solid-state molecu...

The two dinuclear Cd(II) complexes [Cd(BPMST)(SCN)]₂ (1) and [Cd(BPMST)(N₃)Cl]₂ (2) of a s-triazine/pyrazolo ligand (BPMST) were synthesized. The preparation of both complexes was performed in a water–ethanol solvent mixture and involved the mi...

Classical molecular dynamics (MD) simulations have been performed to investigate the effects of substitutions in the octahedral sheet (Mg for Al) and layer charge on an atomistic model of the montmorillonite edge. The edge models considered substitut...

The Schiff base hydrazone ligand HL was prepared by the condensation reaction of 7-chloro-4-quinoline with o-hydroxyacetophenone. The ligand behaves either as monobasic bidentate or dibasic tridentate and contain ONN coordination sites. This was acco...

A heteroleptic homotrinuclear complex, [Zn₃(valhydr)₂(RhB)₂(EtOH)₂](ClO₄)₂ (H₂valhydr = 1,2-bis(2-hydroxy-3-methoxybenzylidene)hydrazine, RhB = rhodamine B), was synthesized and structurally characterized by X-ray diffraction on single crystal. In th...

Tertiary diethylpyridylphosphine was synthesized by the reaction of pyridylphosphine with bromoethane in a suberbasic medium. The reaction of phosphine with the copper(I) iodide led to the formation of a copper(I) coordination polymer, which, accordi...

Amongst the convex polyhedra with n faces circumscribed about the unit sphere, which has the minimum surface area? This is the isoperimetric problem in discrete geometry which is addressed in this study. The solution of this problem represents the cl...

The syntheses, structural characterization, and magnetic properties of three lanthanide complexes with formulas [Ln(L¹)₃] (Ln = Dy (1Dy); Er (1Er)); and [Dy(L²)₂] (2Dy) were reported. Complexes 1Dy and 1Er are isostructural with the metal ion in dist...

Anisogrid lattice structures are gaining increasing attention due to their high strength-to-weight ratios, which make them ideal for the production of lightweight mechanical components. This study presents a finite element model developed to evaluate...

This paper reports the syntheses of two new complexes, [Co(L¹)(H₂O)₂] (1) and [{Zn(L²)(μ-OAc)Zn(n-PrOH)}₂] (2), from asymmetric halogen-substituted Salamo-type ligands H₂L¹ and H₃L², respectively. Investigation of the crystal structure of complex 1 r...

This research prepared and characterised novel mixed coordination complexes derived from escitalopram with eugenol and curcumin to form (L₁) and (L₂), respectively. The complexes were prepared via Williamson ether synthesis and analysed by FTIR, UV&n...

Two 1D coordination polymers were synthesized by reaction of two ligands, 2-amino-4-picoline (2A4Pic) and quinoline-6-carboxylic acid (Qu-6-COOH) with two metal (II) nitrate (M = Cd and Cu) in the presence of azide as a linker. The synthesized metal...

The asymmetrical tripodal tetraamine ligand N[(CH₂)₃NH₂]₂[(CH₂)₂NH₂] (ppe) was condensed with 2-acetylpyridine in the presence of nickel(II) ion. In ethanolwater solution the reaction stops after the first stage of condensation, and a new nickel(II)...

Co(II), Cu(II), Zn(II) and Fe(III) complexes of diisopropylthiourea have been synthesized and characterized by elemental analyses, molar conductivity, magnetic susceptibility, FTIR and electronic spectroscopy. The compounds are non-electrolytes in so...

1,2,4-Triazole and its derivatives have been investigated extensively in the construction of coordination polymers. Using a 1,2,4-triazole ligand 1,3-di-(1,2,4-triazole-4-yl)benzene (dtb), a new three-dimensional coordination polymer, {[Cd₂(dtb)₂(SO₄...

Transition metal complexes of Co(II), Ni(II) and Cu(II) metal ions with general stoichiometry [M(L)X]X and [M(L)SO₄], where M = Co(II), Ni(II) and Cu(II), L = 3,3’-thiodipropionic acid bis(4-amino-5-ethylimino-2,3-dimethyl-1-phenyl-3-pyrazoline) and...

2,2-Bis(3,5-dimethylpyrazol-1-yl)-1,1-diphenylethanol (HL) is a heteroscorpionate ligand capable of coordinating metal ions through two nitrogen atoms and one oxygen atom. We report a base free synthetic route to metal complexes of L and explore the...

The crystal and molecular structures of [Ni(Im)₆](dtp)₂ (Im = imidazole, dtp = O,O′-diphenyldithiophosphate) have been determined by X-ray crystallography. It crystallizes in the triclinic system, space group Pī, with cell parameters a = 9.375 (2), b...

Three complexes of Zn(II) with the general formulas {[Zn(H₂O)₄(4,4′-BiPy)](NO₃)₂·2NA·H₂O}_n(1), [Zn(NA)₂Br₂]·2NA (2), and [Zn₂(CH₃COO)₄(NA)₂]·2H₂O (3), where 4,4′-BiPy = 4,4′-bipyridine and NA = nicotinami...

Co(II), Ni(II), Zn(II) and Cu(II) complexes of (3E)-3-[(2-{(E)-[1-(2,4-dihydroxyphenyl)ethylidene]amino}ethyl)imino]-1-phenylbutan-1-one (DEPH₂) derived from ethylenediamine, 2′,4′-dihydroxyacetophenone and 1-phenylbutane-1,3-dione have been synthesi...

In this paper, the ternary system La₂O₃-TiO₂-Nb₂O₅ is studied to find new ternary phases with useful electrical properties. The solid solution La_3−xTi_5−3xNb_10−2xO_39.5−12.5x was recently identified, and this study focuses on th...

Since the octahedral high-spin iron(II) complex has the ⁵T_2g ground term, the spin-orbit coupling should be considered in magnetic analysis; however, such treatment is rarely seen in recent papers, although the symmetry-sensitive property is of inter...

The three novel cadmium(II) cyanide coordination polymers with alkoxyethanols, [Cd(CN)₂(C₂H₅OCH₂CH₂OH)]_n (I), [{Cd(CN)₂(C₄H₉OCH₂CH₂OH)}₃{Cd(CN)₂}]_n (II) and [{Cd(CN)₂(H₂O)₂}{Cd(CN)₂}₃·2(C₆H₁₃OCH₂CH₂OH)]_n (III), were synthesized and charcterized by st...

The synthesis and characterization of Co(II) and Ni(II) mixed ligand complexes are derived from isoniazid, 9-fluorenoneandoxalate. The metal complexes were characterized on the basis of elemental analysis, IR, UV-visible, CV, PXRD, and molar conducta...

The technological promise of nonlinear optical (NLO) compounds has stimulated intense interest in optoelectronic devices, data storage, photonics, and anticancer therapy. Thiosemicarbazone ruthenium materials are of growing interest because of their...

Transition metal complexes with β-diketonate and diamine ligands are valuable precursors for chemical vapor deposition (CVD) of metal oxide nanomaterials, but the metal-ligand bond dissociation mechanism on the growth surface is not yet clarified in...

Glucose–carbon hybrids were synthetized with different carbon materials, namely carbon nanotubes, reduced graphene oxide, carbon black and activated carbon by a hydrothermal treatment. These carbon hybrids were used as Pt-supports (1 wt.%) for...

Ba_2−xSr_xZnWO₆ double perovskite (DP) oxide compounds (x = 1, 1.25, 1.5, 1.75, 2) were successfully created by means of conventional solid-state techniques. The crystal structures of our series were studied using an X-ray diffractometer. The x = 1 com...

In this study, we report the cytotoxicity of a newly synthesized Schiff base HL ((E)-2-ethoxy-6((pyren-1-ylimino)methyl)phenol) and its derived metal complexes (Zn(II), Cu(II), Co(II), Cr(III), and Fe(III)) along with their structural characterizatio...