Reaktivität der Metall-Metall-Mehrfachbindung in Übergangsmetall-Komplexen: XIV. Reaktion von Cp *2CoRh(μ-CO) 2 (Cp * = η 5-C 5Me 5) mit Schwefel oder Selen und Molkülstruktur von Cp *2CoRh(CO) 2(μ-Se) 2

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The reaction of Cp * 2CoRh(μ-CO) 2 ( M M; Cp * = η 5-C 5Me 5) with elemental sulfur or selenium gives the complexes Cp * 2CoRhS 8 and Cp * 2CoRhSe 5, both are distinguished by a high chalcogen content. The only CO containing intermediate product Cp * 2CoRh(CO) 2Se 2 that was isolated has been characterized by an X-ray diffraction study. The compound contains a rhombohedric, planar M 2E 2 four-membered ring (angle CoSeRh 101.3(1)°) bonded to anti-oriented Cp * and CO ligands. Other CO-containing intermediates can be detected only spectroscopically. Thus the Co atom in the MM double bond exerts an accelerating influence on the reaction rate when compared to Rh.