Syntheses, studies and crystal structures of coordination polymers and dinuclear complexes of mercury(II) halides and thiocyanate with a symmetrical Schiff base ligand

Strategic Substitution of -OH/-NR2 (R=Et, Me) Imparts Colorimetric Switching between F- and Hg2+ by Salicyaldehyde/Benzaldehyde-Quinoxaline Conjugates

We herein report two salicyaldehyde-quinoxaline (HQS and HQSN) conjugates and a benzaldehyde-quinoxaline (QBN) conjugate to fabricate selective chemosensors for F^- and Hg²⁺ in the micromolar range. This work demonstrates how sensing outcomes are affected by modulating proton acidity by introducing an electron donating group, -NEt₂ , in the probe backbone. Interestingly, the un-substituted probe HQS can selectively detect F^- , whereas HQSN and QBN are selective for Hg²⁺ . In order to gain insights into the mechanism of sensing, geometry optimizations have been carried out on QS^(-1) , QS^(-1) ⋅⋅⋅HF, QSN^(-1) and QSN^(-1) ⋅⋅⋅HF and the experimental data are validated in terms of free energy and pK_a values. Detailed DFT and TD-DFT analyses provide ample support towards the mechanism of sensing of the analytes.

Spectral, Structural, Theoretical and Docking Studies of a Mn(II) Complex with an N4-Donor Ligand

The complex [Mn(EMMP)(OAc)2]·3H2O, [EMMP = N,N′-(ethane-1,2-diyl)bis(1-phenyl-1-{pyridin-2-yl}methanimine] has been prepared and has a distorted square-faced bicapped trigonal prismatic geometry. In the crystal network of the complex, the water molecules form stronger hydrogen bonds than the complex molecules and participate in the formation of R44(8) hydrogen bond motifs. The ability of the complex and its ligand to interact with the biomacromolecules (BRAF kinase, CatB, DNA gyrase, HDAC7, rHA, RNR, TrxR, TS and Top II) has been investigated by docking calculations and compared with that of doxorubicin.

Inorganic–organic hybrid materials based on PbBr2 and pyridine–hydrazone blocks – structural and theoretical study

A new series of lead(ii) coordination polymers was generated from PbBr₂ and various pyridine–hydrazone blocks; their detailed structural, topological and theoretical analysis was performed.

From monomers to polymers: steric and supramolecular effects on dimensionality of coordination architectures of heteroleptic mercury(ii) halogenide–tetradentate Schiff base complexes

We report the synthesis and X-ray characterisation of six mercury(ii) halogenide–tetradentate Schiff base complexes.

Synthesis, Spectral, and In Vitro Antibacterial Studies of Organosilicon(IV) Complexes with Schiff Bases Derived from Amino Acids

The present work stems from our interest in the synthesis, characterization, and antibacterial evaluation of organosilicon(IV) complexes of a class of amino-acid-based Schiff base which have been prepared by the interaction of ethoxytrimethylsilane with the Schiff bases (N OH) in 1 : 1 molar ratio. These complexes have been characterized by elemental analysis, molar conductance, and spectroscopic studies including electronic IR and NMR ((1)H, (13)C, and (29)Si) spectroscopy. The analytical and spectral data suggest trigonal bipyramidal geometry around the silicon atom in the resulting complexes. The ligands and their organosilicon complexes have also been evaluated for in vitro antimicrobial activity against bacteria (Bacillus cereus, Nocardia spp., E. aerogenes, Escherichia coli, Klebsiella spp., and Staphylococcus spp.). The complexes were found to be more potent as compared to the ligands.