Syntheses and structural characterization of organotin(IV) complexes derived from the self-assembly of 2,4-diethylglutaric acid, phthalyl-glutamic acid and trialkyltin salts

Six new triorganotin(IV) complexes, {(R3Sn)2[C7H14(COO)2]}n (R = Me: 1), (R3Sn)2[C7H14(COO)2] (R = Bu: 2; Ph: 3), {(R3Sn)2[C11H9NO2(COO)2]}n·Y (R = Me, Y = CH2Cl2: 4, R = Bu, Y = 0: 5) and (R3Sn)2[C11H9NO2(COO)2] (R = Ph: 6) have been prepared by treatment of 2,4-diethylglutaric acid, phthalyl-glutamic acid and the corresponding R3SnCl (R = Me, Bu, Ph) with sodium ethoxide in methanol. All the complexes were characterized by elemental analysis, FT-IR, NMR (1H, 13C, 119Sn) spectroscopy, and TGA. Except for 3 and 6, all of the complexes were also characterized by X-ray crystallography. The structural analyses reveal that complexes 1 and 4 have 2D network structures in which 2,4-diethylglutaric acid and phthalyl-glutamic acid act as tetradentate ligands coordinated to trimethyltin(IV) ions. Complex 2 has a dinuclear structure, and complex 5 has a 1D zigzag chain structure and forms a 2D supramolecular framework through intermolecular C–H⋯O interactions.