Double O,C,O-chelated diorganotin(IV) derivatives

Novel diorganotin(IV) compounds (L1,2)2SnCl2, where L1,2 are O,C,O-chelating ligands (called the pincer ligands), 2,6-bis(alkoxymethyl)phenyl-, View the MathML source2,6-(ROCH2)2C6H3-, (L1, R = Me, L2, R = t-Bu), have been synthesized and characterized by 1H, 13C and 119Sn NMR spectroscopy, MS-ESI spectrometry and elemental analysis. The structure of both compounds (L1)2SnCl2 (1) and (L2)2SnCl2 (2) was determined by X-ray crystallography. Determination of crystal structures reveals different shapes of coordination polyhedra. While deformed octahedron was found for 1, tetrahedral geometry of the tin atom was determined for 2. The NMR spectroscopy indicates a similar structural arrangement of 1 and 2 in solution. The reaction of 1 with silver salts of low nucleophilic anions X− (X = OTf and 1-CB11H12) resulted in (L1)2SnCl(OTf) (3), (L1)2Sn(OTf)2 (4), and (L1)2SnCl(CB11H12) (5). The compounds 4 and 5 are of ionic nature both in solid state and in solution of CH3CN.