Self-assembly of triorganotin(IV) moieties with 1,2,4,5-benzenetetracarboxylic acid: Syntheses, characterizations and influence of solvent on the molecular structure

A series of triorganotin carboxylates based on 1,2,4,5-benzenetetracarboxylic acid (H4btec): [(Ph3Sn)8(btec)2(CH2CH3OH)2]n·2n(CH3CH2OH) (1), [(Ph3Sn)4(btec)(DMF)4] (2), and [(Cy3Sn)4(btec)(DMF)4] (3) were synthesized and characterized by elemental analysis, IR, 1H and 13C NMR spectroscopy and X-ray crystallography diffraction analyses. In 1–3, all four carboxyl groups of H4btec coordinate with tin atoms in monodentate mode. The molecular structure of complex 1 is 1D infinite chains further linked by hydrogen bonds forming a 2D supramolecular network. Complexes 2 and 3 are symmetric monomers connected via hydrogen bonds. It is found that coordinating solvent molecules can change their molecular structures.

Trialkyltin hydroxide and H4btec were heated under reflux in benzene to get a series of relative organotin carboxylates. Using different solvent to recrystallize can partly control their molecular structures.Figure optionsDownload as PowerPoint slideHighlights
► Three novel organotin carboxylates based on H4btec were synthesized and characterized.
► Their molecular and supramolecular structures are discussed in detail.
► It is found that coordinating solvent molecules can change their molecular structures.