Synthesis and X-Ray Structural Studies of Amino Acids Half Sandwich Complexes of Osmium(II)

Authors : Raja Adil SARFRAZ, Tasneem Gul KAZI, Shahid IQBAL, Hassan İmran AFRIDI

Pages : 237-247

View : 18 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The amino acids complexes of osmiuminsert ignore into journalissuearticles values(II);, i.e. [Osinsert ignore into journalissuearticles values(h 6-p-cymene);insert ignore into journalissuearticles values(h1-N-insert ignore into journalissuearticles values(rac);-phenylglycine methyl ester);Cl2] insert ignore into journalissuearticles values(A); and [Osinsert ignore into journalissuearticles values(h 6-p-cymene); insert ignore into journalissuearticles values(h1-N,N`-insert ignore into journalissuearticles values(S);-phenylalanine amido); Cl] insert ignore into journalissuearticles values(B);, were prepared by an ultrasound energy-assisted method at room temperature. The solid structures of the newly synthesized complexes were determined by single crystal X-ray analysis. In A, osmium is bonded to 2 chloride ligands, the h 6-coordinated p-cymene molecule, and to a nitrogen atom of the corresponding amino acid derived ligand, whereas in the case of B the central osmium is surrounded by an N, N` bidentate amino amide ligand, by an h 6-coordinated p-cymene molecule, and a chloride ligand. Both complexes have a pseudo-tetrahedral geometry. As shown by X-ray structure, A exhibited racemization of the corresponding ligand. The ligand retained its configuration in B with co-crystallization of the 2 diastereomers, ROsSC and SOsSC, in a single crystal.
Keywords : Osmium, X Ray studies, N ligands, Amino acids, Half sandwich Complexes