Abstract
A reaction between (η 5-C 5H 5)Rh(CO) 2 and bis(1,3-dimethylimidazolindin-2-ylidene) in methylcyclohexane produces (η 5-C 5H 5)Rh(CO)[ C(NMe)CH 2CH 2(N Me)] in 53% yield. This mononuclear cyclopentadienylrhodium carbene complex was characterized by elemental analysis, 1H NMR, 13C{ 1H} NMR, IR, mass spectral, and single-crystal X-ray diffraction methods. The compound (η 5-C 5H 5)Rh(CO)-[ C(NMe)CH 2CH 2(N Me)] crystallizes in the monoclinic space group P2 1/ n with a 9.053(3), b 10.256(4), c 12.696(5) Å, β 91.18(3)° and D calc 1.66 g cm −3 for Z = 4. The structure was refined by least-squares techniques to a final conventional R value of 0.045 using 1739 independent observed ( I ≥ 3σ(I)) reflections. The overall structure is that of a two-legged piano stool. The RhC(η 5) separations average 2.29(3) Å. The RhC and RhCO bond lengths are 1.994(7) and 1.795(9) Å, respectively.
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