Abstract
The planar complex compound biacetylbisbenzoylhydrazonenickel (II) Ni(BBH)], diamagnetic, with dsp 2 hybridation, forms addition compounds with various nitrogen bases containing two molecules of base. The different absorption characteristics of the two coordination compounds allow to determine the formation constants of the complexes in non polar solvents by means of spectrophotometric measurements. The main factors controlling the stability of the complexes have been investigated and the relationship between the base strenght and coordinating tendency toward Ni(BBH) is discussed in terms of electronic and steric factors. From the measurements of the temperature dependence of the formation constants, the heats of reaction, free energy and entropy changes have been calculated and discussed. The different orders of entropy changes observed can be explained as a particular type of ⪡ortho effect⪢ and in the π-bond character ascribed to the coordinate links between nickel and the nitrogen atom of the heterocyclic amines.
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