PREPARATION AND SPECTROSCOPIC STUDIES OF THE COMPLEXES OF DIACETAMIDE WITH METAL(II) PERCHLORATES

摘要

The preparations of complexes formed by diacetamide (DA) with metal(II) perchlorates in 1:4 and 1:2 stoichiometry are reported. The ESR spectra, at both X- and Q-band, of Mn(II) ions doped in all these complexes and also those of 1:3 stoichiometry are reported, and the zero-field splitting parameters D and lambda(=E/D) are deduced. Very small values of D observed for complexes M(DA)(3)(ClO4)(2) (M=Fe, Co, Ni) are consistent with an O-6(2+) chromophore. The corresponding Zn and Cd complexes have distinctly higher D values. The identical values of D and lambda, observed for all complexes with 1:4 stoichiometry, suggest identical structures and the X-ray powder patterns of these complexes also show marked resemblances. Considerably higher values of lambda for M[(DA)(2)(H2O)(2)](ClO4)2 (M= Co, Zn) show appreciable distortion. IR spectra distinguish coordinated from hydrogen bonded diacetamide. [References: 12]