HYPERVALENT ORGANOTIN(IV) DERIVATIVES CONTAINING DIFFERENT BRIDGING UNITS

Richard A. Varga, Adina Rotar and Cristian Silvestru

“Babes-Bolyai” University, Faculty of Chemistry & Chemical 
Engineering, 11 Arany Janos St., RO-400028 Cluj-Napoca, Romania;
E-mail:  richy@chem.ubbcluj.ro 

A series of hypervalent organotin(IV) derivatives containing oxygen-based bridging units, i.e. [{2-(Me2NCH2)C6H4}2Sn(OH)]2 •2(NO3)·2CHCl3 (1), [{2-(Me2NCH2)C6H4}2Sn(OH)]2O (2), [{2-(Me2NCH2)C6H4}2Sn]2(O)(CO3) (3) and [{2-(Me2NCH2)C6H4}2Sn]2(O)(SO4)·2CHCl3 (4), were prepared and characterized. The molecular structure of compounds 1 - 4 was determined by single-crystal X-ray diffraction. The crystals of these compounds contain two hypervalent organotin(IV) moieties linked by different fragments: two hydroxyl groups in 1, one oxygen atom in 2, and one oxygen atom and a cabonato- or sulfato- group in 3 and 4, respectively. In all compounds the tin atoms are hexacoordinated, with a distorted octahedral environment. Compounds 1, 3 and 4 contain inorganic rings, i.e. Sn2O2 in 1, Sn2O3C in 3 and Sn2O3S in 4, respectively, based on oxygen bridging atoms. In all cases the nitrogen atom of the CH2NMe2 pendant arm is strongly coordinated to the metal center, in trans to an oxygen atom.
     
        [{2-(Me2NCH2)C6H4}2Sn(OH)]2O		   [{2-(Me2NCH2)C6H4}2Sn]2(O)(SO4)