77244-08-7Relevant academic research and scientific papers
Syntheses and reactivity of square-planar Rh(I) complexes, LRh(CO) (L = unsymmetric tridentate chelating pyrazolylgallate ligand). X-ray crystal structures of Rh(CO) and Rh(COMe)I, (pz = pyrazolyl, N2C3H3)
Louie, Brenda M.,Rettig, Steven J.,Storr, Alan,Trotter, James
, p. 3019 - 3026 (2007/10/02)
The syntheses and characterization of a number of square-planar Rh(I) monocarbonyl complexes incorporating unsymmetrical, tridentate, pyrazolylgallate ligands in a meridional coordination mode are described.Oxidative addition reactions of these complexes are detailed and a facile migratory insertion reaction, following the addition of methyl iodide, has resulted in a five-coordinate square-pyramidal Rh(III) acetyl complex.Crystal structures of two compounds are presented, Rh(CO) and Rh(COMe)I, and confirm the molecular arrangements predicted on the basis of other physical measurements.Crystals of the former are monoclinic, a = 10.212(2), b = 7.8484(5), c = 16.733(2) Angstroem, β = 105.133(6) deg, z = 4, space group P21/c; and those of the latter are monoclinic, a = 10.0960(11), b = 11.5352(8), c = 15.871(2) Angstroem, β = 105.764(6) deg, z = 4, space group P21/n.Both structures were solved by conventional heavy atom methods and were refined by full-matrix least-square procedures to R = 0.026 and 0.036, respectively, for 2142 and 2941 reflections with I >/= 3?(I).
PYRAZOLATE BRIDGED DINUCLEAR RHODIUM COMPLEXES, X-RAY STRUCTURE OF 2
Uson, R.,Oro, L.A.,Ciriano, M.A.,Pinillos, M.T.,Tiripicchio, A.,Tiripicchio Camellini, M.
, p. 247 - 257 (2007/10/02)
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.
