The compounds [SnBr4(L)2] (where L is formamide (fa), acetamide (a), N,N-dimethylacetamide (dma), benzamide (ba), thioacetamide (ta), N,N-dimethylthioformamide (dmtf), NN-dimethylthioacetamide (dmta) or thiobenzamide (tba)) were synthesized and characterized by melting points, elemental analysis, thermal analysis and IR spectroscopy. The enthalpies of dissolution of the adducts, tin(IV) bromide and ligands in methanol were measured and by using thermochemical cycles the following thermochemical parameters for the adducts have been deter-mined: the standard enthalpies for the Lewis acid/base reactions (Delta(r)H(theta)), the standard enthalpies of formation (Delta(f)H(0)), the standard enthalpies of decomposition (Delta(D)H(0)), the lattice standard enthalpies (Delta(M)H(0)) and the standard enthalpies of the Lewis acid/base reactions in the gaseous phase (DeltarH(theta)(g). The mean bond dissociation enthalpies of the tin(IV)-oxygen ((D) over bar ((Sn-S))) and tin(IV)-sulphur bonds (D) over bar((Sn-O))) have been estimated. (C) 2002 Elsevier Science B.V. All rights reserved.389416712531