Abstract

The heterobimetallic complex syn-[Cr(CO) 3(μ,η:η-indenyl)Rh(COD)] was obtained of syn-[Cr(CO) 3(μ,η:η-indenyl(Rh(CO) 2] with COD. The stereochemistry was retained in the exchange reaction as confirmed by 1H and 13C NMR measurements and by X-ray diffractometric analysis. In spite of great distortion, the COD complex is quite stable. An unusual bonding interaction between the hybrid CO orbitals of the Cr(CO) 3 group and the s-orbital of methine hydrogen atoms of COD is inferred on the basis of spectroscopic and X-ray structural data.

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