Preparation, IR and 1H NMR spectral studies of triorganotin(IV) complexes of N-benzoylglycine and N-benzoylglycylglycine

Add time:07/20/2019    Source:sciencedirect.com

The triorganotin(IV) derivatives of N-benzoylglycine (HAA); R3SnAA and N-benzoylglycylglycine (HDP), R3SnDP (R = methyl, n-propyl, n-butyl, phenyl, cyclohexyl, respectively) have been prepared from the triorganotin(IV) chlorides R3SnCl and the appropriate sodium salts of the N-benzoylamino acids. N-Benzoylglycine complexes have penta-coordinate trigonal bipyramidal structure of tin(IV) with chelating bidentate carboxylate group in the solids and in chloroform solution. N-Benzoylglycylglycine complexes are penta-coordinate and are polymers in the solid state. The tin atom in triorganotin(IV) groups R3Sn are coordinated by the unidentate carboxylic group and by the oxygen atoms of the amidocarbonyl group of the adjacent molecule. The complexes are monomers in non-coordinating solvents (CHCl3, benzene and nitrobenzene). The HAA complexes retain the penta-coordinate geometry in solution, which is in contrast to the previously reported complexes with N-benzoyl-, N-acetyl- and N-formylamino acids and the corresponding dipeptides which are tetrahedral [1–3].

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