Dixit N. Sathyanarayana

Cobalt(II), nickel(II) and copper(II) complexes of bidentate bibenzimidazoles

SummaryComplexes of cobalt(II), nickel(II) and copper(II) with novel bidentate bibenzimidazoles, [M(L-L)Cl2], where L-L are methylenebis(1, 1′-benzimidazole), methylenebis(2, 2′-benzimidazole) and dimethylenebis(2, 2′-benzimidazole) are described and characterized by different physical measurements. The four coordinate complexes have distorted tetrahedral or square coplanar structures. The bridging entity between the two donor groups apparently influences the ligand field strength and the ligands occupy a higher position than that of benzimidazole in the spectrochemical series.

Electron paramagnetic resonance and conductivity studies on poly(m-toluidine) salts and their bases

Five different poly(m-toluidine) (PMT) salts were synthesized chemically using different protonic acids and their bases were obtained by dedoping the salts using aqueous

Conducting poly(2-methylaniline) salts and their bases: temperature-dependent EPR studies

NH_4OH

13C AND 1H NMR STUDY OF COMPLEXES OF 2-PYRIDINETHIONE AND 4-PYRIDINETHIONE WITH Zn(II), Cd(II) AND Hg(II) HALIDES

. The electron paramagnetic resonance (EPR) spectra of PMT salts and their.bases were recorded at different temperatures. The results show a thermally activated dependence for PMT-HCI and a Curie-Weiss behaviour in the range 40 to 200 °C for the other salts. The EPR signal intensities of the PMT bases are temperature-independent except for PMT dedoped from

SOME METAL COMPLEXES WITH N-(2-PYRIDYL)THIOACETAMIDE AND N-(2-PYRIDYL)THIOBENZAMIDE

CH_3COOH

IRON(II, III) COMPLEXES WITH N, N'-DI(2-)PYRIDYL THIOUREA. MÖSSBAUER AND OTHER SPECTROSCOPIC STUDIES

which shows thermally activated paramagnetism. Ambient-temperature electrical conductivities were obtained by the two-probe method for PMT salts and bases. The results are consistent with polaron spins that are antiferromagnetically coupled. The migration of paramagnetic polarons along the polymer chain alone is not responsible for the charge transport. The effect of substituents on polyaniline is discussed.

Thermal stability of poly (4,4′-methylenedianiline) salts and their bases

Five different poly(2-methylaniline) salts were prepared by chemical polymerization of 2-methylaniline using different protonic acids. The salts were converted into their bases by using aqueous

2-Thioacetamido thiazole as an ambidentate ligand. Complexes of Zn(II), Cd(II), Hg(II) and Cu(I)

NH_4OH

A 1h And 13c Magnetic Resonance And Infrared Spectroscopic Study Of Coordinated 2-Aminocyclopentene-1-Dithiocarboxylic Acid And Its S-Methyl Ester

. EPR spectra were recorded for the solid samples of poly(2-methylaniline) salts and their bases in the temperature range 40-200 °C at intervals of 40 °C. PMA salts and their bases consist of highly mobile radical cations or polarons. The salts show a thermally activated paramagnetism, i.e., polarons are antiferromagnetically coupled to each other, while the bases show temperature-independent or Pauli-type paramagnetism.

Spectroscopic studies on poly(4,4′-methylenedianiline) salts and their bases

Proton and carbon-13 NMR has been used to study complexes of 2-pyridinethione (in its basic and deprotonated forms) and 4-pyridinethione with zinc(II), cadmium(II) and mercury(II) halides. The variations in the carbon-13 and proton chemical shifts are discussed.