HYDROGEN-BONDING IN THE COORDINATION OF N-DONOR 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.