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.