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

Authors

RAJA A. SARFRAZ
TASNEEM GUL KAZI
SHAHID IQBAL
HASSAN I. AFRIDI
MOHAMMAD K. JAMALI
NUSRAT JALBANI
MOHAMMAD BILAL ARAIN

DOI

-

Abstract

The amino acids complexes of osmium(II), i.e. [Os(\eta 6-p-cymene)(\eta1-N-(rac)-phenylglycine methyl ester)Cl_2] (A) and [Os(\eta 6-p-cymene) (\eta1-N,N'-(S)-phenylalanine amido) Cl] (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 \eta 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 \eta 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, R_{Os}S_C and S_{Os}S_C, in a single crystal.

Keywords

Osmium; X-Ray studies, N ligands, Amino acids, Half sandwich Complexes

First Page

237

Last Page

247

Recommended Citation

SARFRAZ, RAJA A.; KAZI, TASNEEM GUL; IQBAL, SHAHID; AFRIDI, HASSAN I.; JAMALI, MOHAMMAD K.; JALBANI, NUSRAT; and ARAIN, MOHAMMAD BILAL (2008) "Synthesis and X-Ray Structural Studies of Amino Acids Half Sandwich Complexes of Osmium(II)," Turkish Journal of Chemistry: Vol. 32: No. 2, Article 11. Available at: https://journals.tubitak.gov.tr/chem/vol32/iss2/11