Ma, Chunlin, Li, Zhenxing, Li, Qianli, Wang, Fei, Zhang, Rufen, and Zhang, Qingfu
Four new triorganotin(IV) complexes, [RSn(OSeCH-4-Et)] (R = Me 1), [RSn(OSeCH-4-Et)] (R = Ph 2), [RSn(OSeCH-2-Et)] (R = Me 3; Ph 4) have been synthesized by the treatment of 4-ethylbenzeneseleninic acid, 2-ethylbenzeneseleninic acid, and the corresponding triorganotin(IV) chloride with sodium ethoxide in methanol. All of the complexes were characterized by elemental analysis, FT-IR, NMR (H, C, and Sn) spectroscopy, TGA, and X-ray crystallography. Crystal structures show that all of the complexes are generated by the bidentate oxygen atoms and the five-coordinated tin centers with trigonal bipyramid geometry. The structural analyses reveal that complex 1 has a centrosymmetric tetranuclear triorganotin selenite with 16-membered macrocycle, which is formed by trimethyltin and ligand alternate linking. A series of C-H···O and π- π stacking interactions in complex 1 play an important function in the supramolecular aggregation. Complex 3 has two 1D spring-like chiral helical chains and crystallizes in the monoclinic space group P2, which is chiral. Complex 2 and 4 are both 1D infinite neutral chain polymers and complex 2 forms a 2D supramolecular framework through intermolecular C-H···O interactions. [ABSTRACT FROM AUTHOR]