Self-assembly of dialkyltin moieties and mercaptobenzoic acid into macrocyclic complexes with hydrophobic 'Pseudo-Cage' or double-cavity structures: Supramolecular infrastructures involving intermolecular C-H...S weak hydrogen bonds and pi-pi interac

摘要

Four novel organotin complexes of two types-[R2Sn(o-SC6H4CO2)](6) (R=Me, 1 center dot H2O; nBu, 2) and {[R2Sn(m-CO2C6H4S)R2Sn(m-SC6H4CO2)SnR2]O}(2) (R=Me, 3; nBu, 4)-have been prepared by treatment of o- or m-mercaptobenzoic acid and the corresponding R2SnCl2 (R=Me, nBu) with sodium ethoxide in ethanol (95%). All the complexes were characterized by elemental analysis, FT-IR and NMR (H-1, C-13, Sn-119) spectroscopy, TGA, and X-ray crystallography diffraction analysis. The molecular structure analyses reveal that both 1 and 2 are hexanuclear macrocycles with hydrophobic "pseudo-cage" structures, while 3 and 4 are hexanuclear macrocycles with double-cavity structures. Furthermore, the supramolecular structure analyses show that looser and more intriguing supramolecular infrastructures were also found in complexes 1-4, which exist either as one-dimensional chains of rings or as two-dimensional networks assembled from the organometallic subunits through intermolecular C-H center dot center dot center dot S weak hydrogen bonds (WHBs) and pi-pi interactions.