Syntheses and spectra of triphenyltin heteroarenethiolates - Crystal structures of triphenyltin 1-methyltetrazole-5-thiolate and triphenyltin benzoxazole-2-thiolate

Reactions between Ph3SnCl and the sodium salts of 5-mercapto-1-methyltetraz ole (MTS-H), 2-mercaptobenzoxazole (MBZ-H), 2-mercaptobenzothiazole (MBT-H) and 2-mercapto-1-methylimidazole (MMI-H) gave Ph3Sn(MTS) (5. R=Ph, R'=Me), Ph3Sn(MBZ) 6, Ph3Sn(MBT) 7 and Ph3Sn(MMI) 8, respectively. Characterisatio n has been carried out for all compounds by IR, Mossbauer, H-t, C-13 and Sn -119 NMR spectroscopy as well as by X-ray crystallography for (5: R=Ph, R'= Me) and 6. Bath (5: R=Ph, R'=Me) and 6, in the solid state, have cis-trigon al bipyramidal geometries due to intramolecular Sn-N(2) interactions. Mossb auer data for 7 was interpreted as indicating a similar cis-trigonal bipyra mid geometry. The chelating ability of nitrogen-containing heteroarenethiol ato groups, based on the strength of Sn-N inter-molecular bonds in Ph3SnS-h eteroarenes, decreases in the sequence: pyridine-2-thiolato>pyrimidine-2-th iolato > 1-methylimidazole-2-thiolato > benzoxazole-2-thiolato > 1-methylte trazole-5-thiolato > 1-phenyltetrazole-5-thiolato. On dissolution, the Sn-N interactions in 5-8 undergo at least partial breakage. (C) 1999 Elsevier S cience Ltd. All rights reserved.