SYNTHESIS AND SPECTROSCOPIC STUDIES OF MONO- AND DI-ORGANOTIN(IV) DERIVATIVES OF PYRIDINECARBOXYLIC ACIDS

Article abstract of DOI:10.1016/S0022-328X(00)82470-5

A series of diorganotin bis(pyridinecarboxylates), R2Sn(O.CO.C5H4N-n)2 (R = Me, n = 2-4; R = Ph, n = 2 or 3), diorganochlorotin pyridinecarboxylates, R2ClSnO.CO.C5H4N-n (R = Me or Ph, n = 2; R = Me, n = 4) and monoorganodichlorotin pyridinecarboxylates, RCl2Sn(O.CO.C5H4N-2) (R = Bu or Ph),has been synthesised and their structures investigated by 119mSn Moessbauer and infrared spectroscopy. The spectra indicate that, in the solid state, the three dimethyltin bis(pyridinecarboxylates), along with diphenyltin bis(3-pyridinecarboxylate) and dimethylchloro- and diphenylchloro-tin 2-pyridinecarboxylate, adopt a trans-octahedral R2SnX4 geometry.Dimethylchlorotin 4-pyridinecarboxylate, however, possesses a five-coordinate trigonal bipyramidal cis-R2SnX stereochemistry, whilst diphenyltin bis(2-pyridinecarboxylate) adopts an octahedral cis-R2SnX4 structure, with two bidentate N-chelating pyridinecarboxylate groups.