Hydrogen bonding in the coordination of N- and S-donor heterocycles to dialkyltin dihalides. Synthesis and structure of trans-dibromodicyclohexylbis(pyrazole-N2)tin(IV), trans-dibromodicyclohexylbis(imidazole-N3)tin(IV), and dibutyldichloro[1-methyl-2(3H)-imidazolinethione-S]tin(IV)

Hexacoordinate octahedral crystalline complexes of dicyclohexyltin dibromide with pyrazole (1) and imidazole (2) have been prepared. The X-ray structures have been determined and the effect of the bulkiness of the alkyl groups bonded to the tin on aspects of the structures (such as intra-and inter-molecular hydrogen bonding, orientation of the ligand plane, and Sn-N bond length) is discussed. As an example of a pentacoordinate trigonal bipyramidal complex, the 1:1 adduct of dibutyltin dichloride with 1-methyl-imidazoline-2-thione (3) has been synthesized and its structure studied.