Self-assembly of triorganotin(IV) or diorganotin(IV) moieties and 2-methylpyrazine-5-acid: Syntheses, characterizations and crystal structures of monomeric, polymeric or tetranuclear macrocyclic compounds

摘要

A series of diorganotin(IV) and triorganotin(IV) compounds of the type [R2Sn(pca)(2)ClSnR3](2) (R=PhCH2 1, 2-C/C6H4CH2 2, 2-FC6H4CH2 3,4-FC6H4CH2 4,4-CNC6H4CH2 5,4-ClC6H4CH2 6,2,4-Cl2C6H3CH2 7; Hpca=2-methylpyrazine-5-acid), [(Bu-n)(3)Sn(pca)]infinity 8, [(CH3)(2)Cl2Sn(pca)Sn(CH3)(2)(pca)](infinity) 9, ([(Bu-n)(2)Sn(pca)](2)O}(2) 10 and {[Ph2Sn(pca)](3)O-2[Ph2Sn(OCH3)]} 11 have been obtained by reactions of 2-methylpyrazine-5-acid with triorganotin(IV) chloride, diorganotin(IV) dichloride, and diorganotin(IV) oxide. All compounds were characterized by elemental, IR, and NMR spectra analyses. The crystal structure of compounds 1, 8-11 were determined by X-ray single crystal diffraction, which revealed that compound 1 was tetranuclear macrocyclic structures with seven-coordinate and five-coordinate tin atoms, compounds 8 and 9 were polymeric chain structures with five-coordinate and seven-coordinate tin atoms, compounds 10 and 11 were monomeric structures with six-coordinate and five-coordinate tin atoms. (c) 2006 Elsevier B.V. All rights reserved.