تويت
Abstract
Bis- and tris-Co(II) complexes of 2-hydrazino-4,6-dimethyl pyrimidine (L) are reported: they are of the type CoL2X2·nH2O and CoL3X2·nH2O (X = Cl, Br, I, NO3, ClO3, BF4, SCN and n = 0, 1 or 2). Structural characterisation of the complex species is made from electronic and vibrational spectra, magnetic susceptibility measurements in the solid state and conductivity measurements in solution. The magnetic and electronic spectral data together with the ligand-field parameters suggest a pseudo-octahedral environment for all the Co(II) complexes. An interesting colour change from pink to green on heating CoL2X2·nH2O (X = Cl, Br, NO3)_has been attributed to a stereochemical change from octahedral to tetrahedral as indicated by physico-chemical measurements. IR spectra indicate tentatively the mode of linkage of the ligand molecules and the anion (X) to the metal ion in the solid state.
Bis- and tris-Co(II) complexes of 2-hydrazino-4,6-dimethyl pyrimidine (L) are reported: they are of the type CoL2X2·nH2O and CoL3X2·nH2O (X = Cl, Br, I, NO3, ClO3, BF4, SCN and n = 0, 1 or 2). Structural characterisation of the complex species is made from electronic and vibrational spectra, magnetic susceptibility measurements in the solid state and conductivity measurements in solution. The magnetic and electronic spectral data together with the ligand-field parameters suggest a pseudo-octahedral environment for all the Co(II) complexes. An interesting colour change from pink to green on heating CoL2X2·nH2O (X = Cl, Br, NO3)_has been attributed to a stereochemical change from octahedral to tetrahedral as indicated by physico-chemical measurements. IR spectra indicate tentatively the mode of linkage of the ligand molecules and the anion (X) to the metal ion in the solid state.