1. Synthesis and X-Ray Structural Studies of Amino Acids Half Sandwich Complexes of Osmium(II)
- Author
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SARFRAZ, Raja Adil, KAZI, Tasneem Gul, IQBAL, Shahid, and AFRIDI, Hassan İmran
- Subjects
Osmium ,X-Ray studies,N ligands,Amino acids,Half sandwich Complexes - Abstract
The amino acids complexes of osmium(II), i.e. [Os(h 6-p-cymene)(h1-N-(rac)-phenylglycine methyl ester)Cl2] (A) and [Os(h 6-p-cymene) (h1-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 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.
- Published
- 2014