Synthesis, characterization and structural studies of mixed-ligand di- n-butyltin alkanesulfonate derivatives, [ n-Bu 2Sn(X)OS(O) 2R] 2 [R = Et, n-Pr; X = acac, 4-OMe–O 2CC 9H 5N-2, O 2CC 9H 6N-2, O 2CC 9H 6N-1

Abstract

A number of stable mixed-ligand di- n-butyltin alkanesulfonates, [ n-Bu 2Sn(acac)OS(O) 2R] 2 [R = Et ( 1), n-Pr ( 2)] as well as [ n-Bu 2Sn(X)OS(O) 2Et] 2 [X = 4-OMe–O 2CC 9H 5N-2 ( 3), O 2CC 9H 6N-2 ( 4), O 2CC 9H 6N-1 ( 5) bearing a chelating co-ligand have been synthesized by reacting equimolar quantities of n-Bu 2Sn(OR)OS(O) 2R (R = Et ( 1a) or n-Pr ( 1b)) with acetylacetone or 4-methoxy-2-quinoline/2-quinoline/1-isoquinoline carboxylic acid in dichloromethane/acetonitrile under mild conditions (rt, 10–12 h). The crystal structures of 1– 3 reveal dimeric structural motif in each case by virtue of bridging bidentate mode of the ethane/propanesulfonate groups with distorted octahedral geometry around the tin atoms. The bonding between tin and the alkanesulfonate groups is largely covalent (2.2–2.3 Å) irrespective of the nature of the co-ligand.