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

Abstract

A drum-shaped organooxotin (IV) complex with 2,3,4,5-tetrafluorobenzoic 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, ¹H, ¹³C, ¹¹⁹Sn 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 ··· F hydrogen bonds and π–π 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.

Keywords:

• 2,3,4,5-tetrafluorobenzoic acid
• Organooxotin
• Solvothermal synthesis
• Assembly
• Hydrogen bonding
• π–π stacking interaction

Acknowledgement

We thank the National Natural Science Foundation of China (20271025) for financial support.