Effects of side-chains of N-acetylamino acids on the structures of their triphenyltin(IV) complexes

Triphenyltin(IV) complexes of N-acetylglycine, N-acetyl-L-leucine, N-acetyl -L-asparagine and N-acetyl-L-tyrosine were prepared by two methods and char acterized by means of different spectroscopic methods (FTIR, multinuclear, H-1, C-13 and Sn-119 NMR and Sn-119 Mossbauer). The spectroscopic data indi cated that the N-acetylglycine complex adopts a trigonal-bipyramidal struct ure in which the monodentate carboxylate and the amide -C=O group are bound to the same organotin(IV) moiety. The other three complexes are linear oli gomers in which the planar Ph3Sn(IV) is coordinated axially by a monodentat e carboxylate and an amide -C=O from two different ligands. At the C-termin al end of the oligomer chain there is a tetracoordinated tin(IV) with a mon odentate carboxylate as donor group.