The structures of dicarbonyl[1–4a(10a)-η-phenanthrene](triethylphosphine)chromium(0) and dicarbonyl[1–4a(8a)-η-naphthalene](triphenyl phosphite)chromium(0)

Abstract

Abstract[Cr(CI4HIo){(C2Hs)3P}(CO)2], C22H25CrO2 P (PCrP), is monoclinic, a = 27.081 (12), b = 14.223 (7), c = 11.228 (5) The structures were refined to R = 0.052 for 2462 reflections for PCrP and to R = 0.060 for 3290 reflections for NCrP. The octahedral arrangement around the Cr atom in PCrP is preserved and it is similar to that in the parent tricarbonyl(phenanthrene)-chromium. There is geometrical evidence that the PEt 3 ligand does not introduce any distortion. The Cr-P distance is 2.323 (1) A. Distances of Cr-C-(phenanthrene) are different from those in the tricarbonyl complex. The bulky P(OPh)3 ligand in NCrP gives rise to overcrowding and slightly distorts the octahedral arrangement of Cr. A very short Cr-P length of 2.217 (1) A, is observed. There are no significant changes in the bond distances Cr-C(naphthalene) compared with those in the tricarbonyl complex.