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