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Metal Complexes of Biologically Important Ligands, CXX [1]. Half Sandwich Complexes of Ruthenium(II) and Iridium(III) with R-3-(3-Pyridyl)-D-alaninate Katharina Haas, Heinrich N¨oth [2] und Wolfgang Beck*

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Metallkomplexe mit biologisch wichtigen Liganden, CXX [1].

Halbsandwich-Komplexe von Ruthenium(II) und Iridium(III) mit 3-(3-Pyridyl)-D-alaninat

Metal Complexes of Biologically Important Ligands, CXX [1]. Half Sandwich Complexes of Ruthenium(II) and Iridium(III) with R-3-(3-Pyridyl)-D-alaninate Katharina Haas, Heinrich N¨oth [2] und Wolfgang Beck*

Institut f¨ur Anorganische Chemie der Ludwig-Maximilians-Universit¨at, Butenandtstr. 5 - 13, D-81377 M¨unchen

* Sonderdruckanforderungen an Prof. W. Beck. Fax: (+49) 89 2180 7866.

E-mail: wbe@anorg.chemie.uni-muenchen.de

Herrn Professor Reinhard Schmutzler zum 65. Geburtstag gewidmet Z. Naturforsch.54 b,989–992 (1999); eingegangen am 23. April 1999 Ruthenium, Iridium Complexes, 3-(3-Pyridyl)alanine

The reactions of the chloro bridged complexes [(p-cymene)RuCl2]2 and [(C5Me5)IrCl2]2 with the anion of 3-(3-pyridyl)-D-alanine (L) afford the N,O-chelate complexes (p-cymene)- Ru(L)(Cl) (1) and (C5Me5)Ir(L)(Cl) (2). Abstraction of chloride from1and2using AgSbF6 gives the dimers [(p-cymene)Ru(-L)2Ru(p-cymene)]2+(SbF6)2 (3) and [(C5Me5)Ir(-L)2- Ir(C5Me5)]2+(SbF6)2(4) with coordination of the pyridine N atom. Complex 4is formed in high diastereomeric excess. The structure of (C5Me5)Ir(-L)2Ir(C5Me5)]Cl2(5) which contains the SIrRCRCRIrdiastereoisomer in the crystal was determined by X-ray diffraction.

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