Diorganotin(IV) complexes of dideprotonated pyridoxine (PN, vitamin B6). The crystal structures of [SnEt2(PN–2H)] · CH3OH, [SnEt2(PN–2H)(DMSO)] and [SnBu2(PN–2H)]

The reactions of dimethyl-, diethyl- and dibutyltin(IV) oxides with pyridoxine (PN) in toluene/ethanol led to the formation of compounds [SnR2(PN–2H)] which were characterized by EI and FAB mass spectrometry and by IR, Raman, Mössbauer and 1H, 13C and 119Sn NMR spectroscopy. The structures of [SnEt2(PN–2H)] · CH3OH, [SnBu2(PN–2H)] and [SnEt2(PN–2H)(DMSO)] were determined by X-ray diffractometry. The first two contain dimeric [SnR2(PN–2H)]2 units in which two bridging-chelating pyridoxinate anions link the Sn atoms, while in [SnEt2(PN–2H)(DMSO)] the DMSO coordinates to the tin atom via its O atom in a similar dimeric unit.