The Interaction of Nickel(II) and Copper(II) Schiff Base Complexes with Diorganotin(IV) Dichlorides in Acetonitrile: A Thermodynamic Study

Abstract

Adduct formation of nickel(II) and copper(II) Schiff base complexes, (NiL) and (CuL), as donors with diorganotin(IV) dichlorides as acceptors has been investigated spectrophotometrically, in acetonitrile. L is α,α′-Me2-salen, N,N ′-ethylenebis(α-methylsalicylideneiminate) (1), α,α′-Me2-salpn, N,N ′-1,2-propylenebis(α-methylsalicylideneiminate) (2), α,α′-Ph2-salen, N,N ′-ethylenebis(α-phenylsalicylideneiminate) (3), and α,α′-Ph2-salpn, N,N ′-1,2-propylenebis(α-phenylsalicylidene- iminate) (4). The trend of adduct formation of the nickel(II) and copper(II) Schiff base complexes with a given tin compound decreases as follows: M(α,α′-Me2-salen) > M(α,α′-Me2-salpn) > M(α,α′-Ph2-salen) > M(α,α′-Ph2-salpn). The trend of the reaction of R2SnCl2 toward a given nickel(II) or copper(II) Schiff base complex is Ph > Me > Bu. The trend of the metal reactivity in a given Schiff base toward a given diorganotin(IV)dichloride at the same temperature is Cu(II) > Ni(II).