
%0 Journal Article
%A Dakternieks, DR 
%A Graddon, DP 
%T Thermodynamics of metal-ligand bond formation. VIII. Pyridine adducts of zinc(II) &#946;-diketonates
%J Australian Journal of Chemistry
%D 1973/11/01
%V 26
%N 11
%P 2537-2539
%K 
%R https://doi.org/10.1071/CH9732537
%U https://www.publish.csiro.au/paper/CH9732537 
%X Equilibrium constants and enthalpies in benzene solution are reported for the formation of 1 : 1-adducts of pyridine with four zinc(II) complexes of &#946;-diketones, determined by calorimetric titration. Adduct formation constants at 30°C fall in the range 300-2000 and enthalpies of formation lie between -15 and - 34 kJ mol-1. Though the enthalpies of formation differ little from those of corresponding copper(II) complexes, the adducts are about a hundred times more stable. The pyridine adduct of bis(2,2,6,6-tetramethylheptane-3,5-dionato)zinc(II) is entropy-stabilized relative to those of other complexes. No evidence was obtained for the addition of a second molecule of pyridine under the experimental conditions used. 
