Organotin(IV) complexes of 4,6-dimethylpyrimidine-2-thione, Me2PymtH. Preparation, characterization and crystal structure determination of cis-[Ph2Sn(Me2Pymt)2] and [Ph3Sn(Me2Pymt)]

Abstract

The coordination mode of the ambidentate ligand 4,6-dimethylpyrimidine-2-thione (Me2PymtH) was investigated with respect to the organotin(IV) compounds, namely Me2SnCl2, n-Bu2SnCl2, Ph2SnCl2 and Ph3SnCl. An X-ray crystal structure determination carried out on cis-[Ph2Sn(Me2Pymt)] (3) and [Ph3Sn(Me2Pymt)] (4) revealed that the Me2Pymt- ligand is N,S-coordinated in both complexes. The Sn(IV) atom is six-coordinated in 3 and five-coordinated in 4. The similarities observed in the IR, NMR (1H, 13C) and mass spectroscopy are indicative of a similar behavior of the ligand in all the complexes, thus suggesting a six-coordination in the dimethyltin (1) derivative and five-coordination in the dibutyltin (2) one. The complexes were characterized by means of elemental analysis, IR, NMR (1H, 13C) and mass spectroscopic methods. © 2002 Published by Elsevier Science Ltd.