Electrocatalytic Water Oxidation by Mononuclear Copper Complexes of Bis-amide Ligands with N4 Donor: Experimental and Theoretical Investigation.

The present work describes electrocatalytic water oxidation of three monomeric copper complexes [Cu(L1)] (), [Cu(L2)(HO)] (), and [Cu(L3)] () with bis-amide tetradentate ligands: L1 = ,'-(1,2-phenylene)dipicolinamide, L2 = ,'-(4,5-dimethyl-1,2-phenylene)bis(pyrazine-2-carboxamide), L3 = ,'-(1,2-phenylene)bis(pyrazine-2-carboxamide), for the production of molecular oxygen by the oxidation of water at pH 13.0. Ligands and all complexes have been synthesized and characterized by single crystal XRD, analytical, and spectroscopic techniques.

Hydrolytically Stable Ti-Hydrazone-Based Metallodrugs: Protein Interaction and Anticancer Potential.

In this work, three titanium(IV) [Ti(L)] (-) complexes have been reported using three different tridentate dibasic ONO donor hydrazone ligands, pyridine-4-carboxylic acid (3-ethoxy-2-hydroxybenzylidene)-hydrazide (HL), furan-2-carboxylic acid (3-ethoxy-2-hydroxybenzylidene)-hydrazide (HL), and thiophene-2-carboxylic acid (3-ethoxy-2-hydroxybenzylidene)-hydrazide (HL) tethered with heterocyclic moieties. Elemental analysis, FT-IR, UV-vis, NMR, HR-ESI-MS, and single-crystal X-ray analysis have been used to characterize HL and -. In solid structures of -, two ligand molecules with NO donor sets give distorted octahedral geometries to the metal center.

Electrocatalytic water oxidation by heteroleptic ruthenium complexes of 2,6-bis(benzimidazolyl)pyridine Scaffold: a mechanistic investigation.

Three monomeric ruthenium complexes with anionic ligands [Ru(L)(L)(DMSO)][ClO] (1), [Ru(L)(L)(DMSO)] [PF] (2), and [Ru(L)(L)(DMSO)][PF] (3) [L = pyrazine carboxylate, L = 2,6-bis(1-benzo[]imidazol-2-yl)pyridine, L = 4,5-dmbimpy = 2,6-bis(5,6-dimethyl-1-benzo[]imidazol-2-yl)pyridine, L = 4-Fbimpy = 2,6-bis(5-fluoro-1-benzo[]imidazol-2-yl)pyridine, DMSO = dimethyl sulfoxide] as electrocatalysts for water oxidation are reported herein. The single crystal X-ray structure of the complexes reveals the presence of a DMSO molecule, which is supposed to be the labile group undergoing water exchange under the experimental condition of electrocatalysis. Linear sweep voltammetry (LSV) and cyclic voltammetry (CV) study shows the appearance of the catalytic wave for water oxidation at Ru(IV/V) oxidation.

Fucose-containing Abroma augusta mucilage hydrogel as a potential probiotic carrier with prebiotic function.

The mucilaginous polysaccharide from Abroma augusta stem was examined for its physicochemical, thermal, and functional behavior and explored as a carrier for probiotic bacteria. Composed of glucose, galactose, rhamnose, galactouronic acid and fucose, Abroma augusta mucilage (AAM) exhibited shear thinning behavior (following power law equation) and gel like characteristic (showing higher G' value than G″ value). AAM promoted the growth of probiotic strains with positive prebiotic scores of 0.

Selective cyanide sensing using a Fe(III) complex of pyridoxal-beta alanine Schiff base.

Fluorogenic chemosensors using pyridoxal derivatized ligands as fluorophore is a rapidly growing field of research. Here we report a new Fe(III) complex, [Fe(HBala-pydx)(Bala-pydx)] (HBala-pydx is the Schiff base of pyridoxal with beta-alanine), which can serve as a sensitive and selective turn-on fluorescent sensor for the detection of cyanide(CN) in micromolar concentrations (L.O.

Cubane-like tetranuclear Cu(ii) complexes bearing a CuO core: crystal structure, magnetic properties, DFT calculations and phenoxazinone synthase like activity.

In the present work, two new copper complexes 3a and 3b with a CuO cubane core are reported. Both complexes are obtained by means of the in situ conversion of the imine functionality of Schiff's base ligands 1a [(E)-4-chloro-2-((thiazol-2-ylimino)methyl)phenol] and 1b [(E)-4-bromo-2-((thiazol-2-ylimino)methyl)phenol] into amino alcohols 2a (4-chloro-2-(hydroxy(thiazol-2-ylamino)methyl)phenol) and 2b (4-bromo-2-(hydroxy(thiazol-2-ylamino)methyl)phenol), respectively. The ligand transformation may be metal assisted and the generated ligands show an interesting mode of coordination in which the alkoxo-O atom binds in a μ-manner connecting simultaneously three copper centers and forming a CuO cubane core.