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Abstract
Seven new pink-coloured complexes of cobalt(II) sulphate with the hydrazides of cyclopropane-, cyclopentane-. cyclohexane-and cycloheptanecarboxylic, cyclopentaneacetic, cyclohexane-acetic and cyclohexanebutyric acids have been synthesized from CoSO4. 6H2O and the ligands. All the complexes precipitated as powders with two molecules of the ligand per cobalt atom except Co(CHBH)So4.o. 5H2O. The magnetic moments at room temperature l i e between 3.77 and 5.20 B.M. and are indicative of high-spin octahedral complexes with large o r bital contribution The electronic spectra exhibited a strong band a t 22.OO-24.OO kK which is typical of octahedral cobalt(II) complexes, while the IR spectra showed that the hydrazide molecules form chelate rings about the cobalt(I1) ion.