Studies on the interactions of (η5-C5H5)M(CO)2 complexes (M = Co, Rh) with 1,2-bis(phenylethynyl)benzene, and an x-ray crystallographic characterization of one of the products: (η5-C5H5Co)2(C6H4C2C6H4C2C6H5)2 Academic Article uri icon

abstract

  • Title full: Studies on the interactions of (η5-C5H5)M(CO)2 complexes (M = Co, Rh) with 1,2-bis(phenylethynyl)benzene, and an x-ray crystallographic characterization of one of the products: (η5-C5H5Co)2(C 6H4C2C6 H4C2C6H5)2. The reaction of (η5-C5H5)Co(CO)2 (1) and l,2-bis(phenylethynyl)benzene (4) has been shown to produce as major products a dimeric organic compound of composition C44H28, postulated to be 1,2,4-triphenyl-3-(o-phenylethynylphenyl)biphenylene (7), and bis(η5-C5H5Co)2(C 6H5C2C6H 4C2C6H5)2 (9). Minor organometallic products also obtained include a bis(η4-cyclopentadienone)dicobalt complex (12) and several mononuclear complexes resulting from co-condensation of 4 and 7 with 1. A corresponding reaction betwen (η5-C5H5)Rh(CO)2 (2) and 4 has produced several organorhodium complexes in low yield, including a mixed (η4-cyclobutadiene)(η4-cyclopentadienone)d irhodium derivative (17). Complexes 9, 12 and 17 are derived from the intermolecular condensation of two molecules of 4 with either 1 or 2. An X-ray diffraction investigation of 9 has been undertaken, and unequivocally confirms the unique structural nature of this complex to be that of the b isomer. 9b crystallizes in the monoclinic space group P21/n with cell dimensions: α = 10.652(5), b = 23.690(6), c = 17.204(4) Å, and β = 90.21(3)°; v = 4341(4) Å3. The unit cell was found to contain one solvent benzene for each molecule, yielding a calculated density of 1.351(1) g/cm3 with Z = 4. Intensity data were collected using Mo-Kα radiation (λ = 0.71073 Å) by the θ2θ scan method with an automated 4-circle diffractometer (Enraf-Nonius CAD-4). In all, 8286 reflections were scanned, of which 5192 were independent wit an intensity greater than 3σ. Refinement by full matrix Least squares led to a final unweighted R of 0.037 (Rw = 0.050). The atoms of the (η-C5H5)Co(C4) moieties are well-behaved crystallographically and have molecular parameters which are within accepted values of recent determinations of other complexes containing that moiety. © 1981.

author list (cited authors)

  • Rausch, M. D., Tokas, E. F., Gardner, S. A., Clearfield, A., Chinn, J. W., & Bernal, I.

citation count

  • 6

publication date

  • June 1981