Drum-shaped mono-organooxotin assembly through solvothermal synthesis with 2,3,4,5-tetrafluorobenzoic acid:: crystal structure, hydrogen bonding and π-π stacking interactions

A drum-shaped organooxotin (IV) complex with 2,3,4,5- tetra fluorobenzoic acid of the type {[SnR2(2,3,4,5-F4C6HCO2)]O}(6) (R=m-Cl-PhCH2) has been solvothermally synthesized and structurally characterized by elemental, IR, H-1, C-13, Sn-119 NMR spectra and X-ray crystallography diffraction analysis. This complex exhibits a new structural environment appearing as a drum arrangement with hexa-coordinated tin atoms in a four-membered stannoxane ring, (-Sn-O-)(2), as a common structural feature. Each tin(IV) displays a distorted octahedral geometry. Weak, but significant, intramolecular C-H center dot center dot center dot F hydrogen bonds and pi-pi stacking interactions are shown. These contacts lead to aggregation and supramolecular self-assembly. Cleavage of Sn-C bond occurred in complexes under the influence of strong acid.