Catalytic Studies of Complexes of Organic Compounds. Part-4: Synthesis, Characterization, Catalytic activity of Cd (II) Complex of Chiral Schiff base

Chiral Schiff base ligand from 3,5-Diiodo-salicylaldehyde with a chiral amine (1S,2S)- (+)-1,2-Diaminocyclohexane is synthesized, and its Cd (II) complex was synthesized. These were analysed by the physical constant, TLC, colour, UV-Vis, FTIR and 1H NMR method. Also, efforts were made to study the catalytic activity of Cd (II) chiral schiff base complex. The oxidation of benzyl alcohol was used as model reaction using acetonitrile as solvent. The present reaction system was heterogeneous system of catalysis.

Synthesis, Characterization, and In Vitro Cytotoxicity of Platinum(II) Complexes Bearing Chiral Tetradentate Salicylaldimine Ligands

A series of platinum(II) complexes with chiral Schiff base ligands derived from various salicylaldehydes with (R,R′)- and (S,S′)-cyclohexanediamine were synthesized and characterized by ESI-MS, IR, and NMR. Obtained spectra with typical signals were in agreement with suggested molecular formulae of the complexes. Their photophysical properties were studied by UV-visible and emission spectroscopies. The UV-Vis showed the typical band with low energy at visible range 400–500 nm for MLCT, and this band can emit the luminescent band with emission maximum wavelengths at 529–595 nm. The in vitro cytotoxicity of obtained platinum(II) complexes was screened for KB and MCF-7 human cancer cell lines. The results showed that (S)-enantiomers were more active than (R)-enantiomers and the different positions of methoxy group in salicyl ring gave different cytotoxicities.

Electron Transfer via Helical Oligopeptide to Laccase Including Chiral Schiff Base Copper Mediators

The oxygen reduction efficiency of a laccase-modified electrode was found to depend on the chirality of the oligopeptide linker used to bind the enzyme to the surface. At the same time, the electron transfer between the cathode electrode and the enzyme is improved by using a copper(II) complex with amino-acid derivative Schiff base ligand with/without azobenzene moiety as a mediator. The increased electrochemical current under both O2 and N2 proves that both the mediators are active towards the enzyme.