University of Madras

About: University of Madras is a education organization based out in Chennai, Tamil Nadu, India. It is known for research contribution in the topics: Ring (chemistry) & Lipid peroxidation. The organization has 8496 authors who have published 11369 publications receiving 211152 citations. The organization is also known as: Madras University & University of Chennai.

A Comparative Study of the Electrocatalytic Activities of Some Metal Hexacyanoferrates for the Oxidation of Hydrazine

Abstract: The electrocatalytic properties of electrodes modified with metal [Cr(III), Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Ag(I), Cd(II) and In(III)] hexacyanoferrates(II) were studied by cyclic voltammetry using hydrazine as substrate. The electrodes were prepared by mechanically transferring microparticles of the hexacyanoferrates onto the surface of a paraffin impregnated graphite electrode. The catalytic activities of these compounds were compared based on the ratio of the total current for the catalytic oxidation to the current for the modified electrode. This ratio has been calculated at the peak potentials of the cyclic voltammograms and also at some fixed anodic potentials. As expected for an electrocatalytic reaction, it was observed that the current ratio is higher at slow scan rates and lower at high scan rates. The catalytic activities of hexacyanoferrates are rather complex and they do not follow any uniform pattern. The hexacyanoferrates of manganese, zinc and indium turned out to possess the highest catalytic activity.

A series of oxyimine-based macrocyclic dinuclear zinc(II) complexes enhances phosphate ester hydrolysis, DNA binding, DNA hydrolysis, and lactate dehydrogenase inhibition and induces apoptosis.

Abstract: A symmetrical macrocyclic dizinc(II) complex (1) has been synthesized by using the ligand (L1) [μ-11,24-dimethyl-4,7,16,19-tetraoxa-3,8,15,20-tetraazatricyclo-[20.3.1.110,13] heptacosa-1(25),2,7,9,11,13(27),14,20,22(26),23-decaene-26,27-diol]. A series of unsymmetrical macrocyclic dizinc(II) complexes (2–6) has been synthesized by Schiff base condensation of bicompartmental mononuclear complex [ZnL] [μ-3,16-dimethyl-8,11-dioxa-7,12-diazadicyclo-[1.114,18] heptacosa-1,3,5(20),6,12,14,16,18(19)-octacaene-19,20-diolato)zinc(II)] with various diamines like 1,2-diamino ethane (L2), 1,3-diamino propane (L3), 1,4-diamino butane (L4), 1,2-diamino benzene (L5), and 1,8-diamino naphthalene (L6). The ligand L1 and all the zinc(II) complexes were structurally characterized. To corroborate the consequence of the aromatic moiety in comparison to the aliphatic moiety present in the macrocyclic ring on the phosphate ester hydrolysis, DNA binding and cleavage properties have been studied. The observed first order rate con...