Alkali Metal Complexes. Substitution Reactions

Chemistry Department, Patna University, Patna 800005

Manuscript received 4 September 1972; revised 17 May 1975; accepted 17 May 1975

Acetylacetone and salicylaldehyde though have a higher pK value than o-nitrophenol, 1-nitroso-­2-naphthol, isonitrosoacetophenone or salicylic acid, do not form mixed ligand complexes with alkali metal salts of the above organic acids, but completely replace the ligands and form metal salts/complexes of acetylacetone or salicylaldehyde. It is observed that these substitution reac­tions are not entirely dependent on pK value, but depends on the co-ordinating ability of the ligand.

The solution and thermal studies of the brown adducts of alkali-metal salts of o-nitrophenol and 1-nitroso-2-naphthol also support the above view.