95045-37-7Relevant academic research and scientific papers
Preparation and structure of [Rh3(μ-(Ph2PCH2)2PPh) 2(μ-CO)(CO)(μ-X)X][BPh4] (X = Cl, Br, I), a ligand-poor set of trirhodium clusters
Balch, Alan L.,Fossett, L. Alan,Guimerans, Rosalvina R.,Olmstead, Marilyn M.
, p. 781 - 788 (2008/10/08)
Mild heating (60-80°C) of [Rh3(μ-dpmp)2(CO)3X2][BPh 4] (dpmp is bis[(diphenylphosphino)methyl]-phenylphosphine; X = Cl, Br, I) in solution for 12-48 h results in carbon monoxide loss and the formation of [Rh3(μ-dpmp)2(μ-CO)(CO)(μ-X)X][BPh4]. The infrared, electronic, and NMR (1H, 13C, 31P) spectra of these complexes indicate that they have a common, rigid structure. The structure of [Rh3(μ-dpmp)2(μ-CO)(CO)(μ-Cl)(Cl)][BPh 4]·CH2Cl2 has been determined by X-ray crystallography. The compound crystallizes from dichloromethane-ether in the monoclinic space group P21/n, a nonstandard setting of P21/c (No. 14), with four molecules per unit cell of dimensions a = 22.015 (8), b = 15.002 (4) A?, c = 26.084 (8) A?, and β = 106.95 (2)° at 140 K. Least-squares refinement of 495 parameters using 7796 reflections yields R = 0.072. The structure consists of a bent Rh3 chain with trans triphosphines and a bonding Rh-Rh separation of 2.704 A? for the segment bridged by carbon monoxide and a nonbonded Rh?Rh separation of 2.966 A? for the part bridged by a chloride ligand. The structure is comprised of units which are geometrically similar to previously characterized binuclear and mononuclear complexes.
