Reaction of the diethyltin(IV) cation with pyridoxine (PN, vitamin B6) in the presence of various anionic species: the crystal structure of [SnEt2(PN–H)]Cl

Abstract Reaction of the diethyltin(IV) cation with pyridoxine (PN, vitamin B 6 ) in 80:20 (v/v) ethanol–water mixtures containing NO 3 − and Cl − , NO 3 − and AcO − or Cl − and AcO − ions in various molar ratios was investigated. The compounds [SnEt 2 (PN–H)]Cl ( 1 ), [SnEt 2 (PN–H)](NO 3 )·2H 2 O ( 2 ) and [SnEt 2 (PN–2H)] ( 3 ) were isolated. These compounds were characterized by IR, Raman and Mossbauer spectroscopy and EI and FAB mass spectrometry. The structure of compound 1 , determined by X-ray diffraction, consists of dimeric [SnEt 2 (PN–H)] 2 2+ units (in which two bridging-chelating hydrogen pyridoxinate anions link Sn atoms with coordination number five) and hydrogen-bonded Cl − ions. The behaviour of these compounds in DMSO- d 6 and DMF- d 7 was studied by NMR spectroscopy.