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Equilibrium constants andenthalpies in benzene solution are reported for the formation of 1 : 1-adductsof pyridine with four zinc(II) complexes of β-diketones, determined bycalorimetric titration. Adduct formation constants at 30C fall in the range300-2000 and enthalpies of formation lie between -15 and - 34 kJ mol-1.Though the enthalpies of formation differ little from those of correspondingcopper(II) complexes, the adducts are about a hundred times more stable. Thepyridine adduct of bis(2,2,6,6-tetramethylheptane-3,5-dionato)zinc(II)is entropy-stabilized relative to those of other complexes. No evidence wasobtained for the addition of a second molecule of pyridine under theexperimental conditions used.

Thermodynamics of metal-ligand bond formation. VIII. Pyridine adducts of zinc(II) β-diketonates