Vibrational behavior of transition metal cupferronato complexes: Raman studies on cobalt(II) cupferronato derivatives

The FT-Raman spectrum of cupferron, [PhN2O2]NH4 and the micro-Raman spectra of the new corresponding cobalt(II) cupferronato complexes, CoL(2)A(2), L = PhN2O2, A = H2O, MeOH, o-C6H4(NH2)(2), p-C6H4(NH2)(2) and CoL(2)A, A = (- C6H4NH2-p)(2) were recorded and discussed. All the complexes show a Raman b and at about 1302 cm(-1) and the characteristic v(N-N) and delta (ONNO) mod es of the anionic ligand. The vibrational analysis of the title compounds r eveals the electron delocalisation over the N-nitroso-N-hydroxylaminato (ON NO) unit, as well as the bidentate coordination of the cupferronato ligand to the metal center through the oxygen atoms.