Issue 16, 1974

Crystal and molecular structure of nonacarbonyl-µ-(1,2,3,4-tetraphenylbutadiene-1,4-diyl)-triangulo-triosmium, (Ph4C4)Os3(CO)9

Abstract

Crystals of the title compound occur in two forms: (i) M-form, monoclinic, space group P21/c, Z= 4, a= 12·148(5), b= 9·796(4), c= 29·565(16)Å, β= 91·79(5)°; and (ii) O-form, orthorhombic, space group Iba2, Z= 8, a= 38·45(8), b= 18·59(4), c= 9·80(2)Å. The structures of both modifications were solved by Patterson and Fourier syntheses, and refined by least-squares methods to R 0·095 (4807 reflexions, M-form) and 0·080 (1916 reflexions, O-form); they have the same molecular structure. The molecule is built up of the organic ligand Ph4C4, with a cluster of three osmium atoms at the corners of an isosceles triangle, bonded to two, three, or four carbonyl groups. Co-ordination between Ph4C4 and the cluster is attained viaσ-bonds and the donation of four π-electrons of the osmacyclopentadiene ring. The cluster and the ligand configurations are discussed in relation to those of similar compounds.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1974, 1813-1817

Crystal and molecular structure of nonacarbonyl-µ-(1,2,3,4-tetraphenylbutadiene-1,4-diyl)-triangulo-triosmium, (Ph4C4)Os3(CO)9

G. Ferraris and G. Gervasio, J. Chem. Soc., Dalton Trans., 1974, 1813 DOI: 10.1039/DT9740001813

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