PYRAZOLATE BRIDGED DINUCLEAR RHODIUM COMPLEXES, X-RAY STRUCTURE OF 2

Article abstract of DOI:10.1016/S0022-328X(00)81482-5

The synthesis and properties of complexes of general formulae 2 (Pz = pyrazolate ion, L = phosphorus donor ligand), 2 and 2 are reported.The crystal structure of the novel complex 2 has been determined by X-ray methods.The crystals are triclinic, space group P₁, with Z = 2 in a unit cell of dimensions a 14.061(10), b 17.140(13), c 9.937(7) Angstroem, α 102.19(7), β 10.9.55(8), γ 75.14(8) deg.The structure has been solved by Patterson and Fourier methods and refined by full-matrix least-squares to R = 0.058 for 2514 independent observed reflections.The structure consists of discrete dimeric complexes in which each rhodium is in nearly square-planar arrangement, being bonded to a carbon atom of a carbonyl group, to a phosphorus of a triphenylphosphite ligand and to two nitrogen atoms of pyrazolate ligands bridging the metal atoms.The dihedral angle between the two square planes of 86.2 deg gives a bent configuration to the molecule in which the carbonyls and the phosphite ligands are in a trans arrangement.