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Adduct formation between R₂SnCl₂ (R=methyl and n-butyl) as acceptors, and nickel(II) complexes of tetradentate Schiff base ligands ([NiL]) where L=[3-methoxysalen, N,N′-bis(3-methoxysalicylidene)ethylenediamine], [4-methoxysalen, N,N′-bis(4-methoxysalicylidene)ethylenediamine], [5-methoxysalen, N,N′-bis(5-methoxysalicylidene)ethylenediamine], [salen, N,N′-bis(salicylaldehydo)ethylenediamine], [5-chlorosalen, N,N′-bis(5-chlorosalicylidene)ethylenediamine] and [5-bromosalen, N,N′-bis(5-bromosalicylidene)ethylenediamine] as donors have been investigated in chloroform as a solvent by means of UV–Vis spectrophotometeric analysis. Adducts have been characterized by ¹H NMR, IR and electronic spectroscopy. The formation constants and the thermodynamic free energies were measured using UV–Vis spectrophotometry titration for 1:1 adduct formation at various temperatures (T=278–308K …