Sn(IV) Compounds Interaction with Metal-Schiff Base Complexes

The formation constants and Gibbs free energy for the interaction of RnSnClm (n = m = 2, R = Me, Ph, n-Bu or n = 4, m = 0, R = Ph) compounds as acceptors, with ML complexes (H2L = N,N'-bis(salicylidene)-2-aminobenzylamine (salabza-H2) and its derivatives, M = Mn2+ or Zn2+), as donors in N,N'-dimethylformamide (DMF) as solvent were studied. These parameters were measured by using UV-vis spectrophotomety titration for 1:1 adduct formation of the selected complexes at 25 (±0.1) °C in the 200-500 nm regions. The trend of adduct formation constants between metal Schiff base complexes as donors and tin(IV) as acceptor decreases as follow:Me2SnCl2> Ph2SnCl2 > n-Bu2SnCl2> Ph4Sn[M(5-OMe-salabza)]>[M(salabza)]>[M(5-Br-salabza)]>[M(5-NO2-salabza)]Zn > Mn