A New Approach to Astatistical Stabilisation of Cu(II) Ternary Complexes Containing Tertiary Amines and O-O- Co-ordinating Ligands

Chemistry Department, Faculty of Science, M. S. University of Baroda, Baroda-390 002

The formation constants of the complexes of the type [CuAL], where A=2,2'-dipyridyl, 1,10-pbenantbroline, 2-(2.'-pyridyl)benzimidazole or 2-(2'-pyridyl)imidazoline and L=acetylacetone or benzylacetone have been determined in dioxan-water (1 : 1 v/v) solutions and µ=0.2 (NaClO₄) at 30º. The formation constant values have been determined by graphical method and further refined by using a computer programe. The value of ∆log K (log \(K_{MAL}^{MA}\) -log \(K_{ML}^M\)) is found to be positive in (CuAL) complexes. The fact that ∆log K is positive in Cu(II) complexes, can be explained to be due to repulsion between metal d^π electrons and electron density over L.The study of uv and visible spectra also confirm this concept.