Thermodynamics of metal-ligand bond formation. IX. Trimerization and base addition of Bis(2,6-dimethylheptane-3,5-dionato)nickel(II)

Abstract

The equilibrium constant for trimerization of bis(2,6-dimethylheptane-3,5-dionato)nicke1(11) in benzene solution at 30ºC has been determined spectrophotometrically, K = 2 x 10³ I² mol^-1; the heat of trimerization has been determined calorimetrically, ΔH = -7 kJ (g-atom Ni)¹. Thermo- dynamic data have also been obtained for the base addition reactions with pyridine leading to first Ni₂L₄(py) then NiL₂(py)₂. Results are compared with those previously obtained for other nickel(11) β-diketone complexes.