Uranyl chloride complexes of pyridine-N-oxide and 4-substituted pyridine-N-oxides: Infra-red spectra, electronic spectra and magnetic susceptibility studies

Abstract

Uranyl chloride complexes of pyridine-N-oxide and 4-substituted pyridine-N-oxides have been prepared and investigated by infra-red spectra, electronic spectra, molar conductivity and magnetic susceptibility measurements. All these complexes were found to be weakly diamagnetic. Attempts have been made to correlate the changes observed as a function of the substituent in the characteristic N +O − stretching frequencies of the complexes with the p K α values and the Hammett sigma functions of the ligands. The electronic spectra support the findings of the vibrational spectra that the metal-ligand bond formation has taken place by the donation of the lone pair of p-electrons on oxygen of the NO group to the metal atom orbitals. The conductivity measurements show that these complexes are six co-ordination compounds.