Carbonyl-bis-{6,6'-[(3,3'-di- tert-butyl-5,5'-dimeth-oxy-1,1'-biphenyl-2,2'-di-yl)bis(oxy)]bis-(dibenzo[ d, f][1,3,2]-dioxaphosphepine)}hydridorhodium(I) toluene- d 8 2.25-solvate

Abstract

The crystal-structure determination of the title compound, [RhH(C₄₆H₄₄O₈P₂)₂(CO)]·2.25C₇D₈, is reported. The bis-phosphite ligand, C₄₆H₄₄O₈P₂, is well known as Biphephos. One specific characteristic of this hydrido rhodium(I) monocarbonyl complex is that one bis-phosphite ligand is coordinated in the expected bidentate mode and the other is coordinated in a monodentate mode. Thus, one phosphite moiety remains non-coordinating. All three coordinating phospho-rus atoms occupy the equatorial positions in the trigonal-bipyramidal environment around the rhodium atom. The crystals of the hydrido rhodium(I) monocarbonyl complex contains deuterated solvent mol-ecules (toluene-d ₈). Most of them are included in the model, but the contributions of about 0.84 toluene per unit cell were removed from the diffraction data, using the SQUEEZE procedure in PLATON [Spek (2015 ▸). Acta Cryst. C71, 9-18].

Keywords: Biphephos; bis­phosphite; crystal structure; hydride complex; rhodium.

Figure 1

Mol­ecular structure of the title compound with displacement ellipsoids drawn at 30% probability level. Co-crystallized solvent and C–bound hydrogen atoms are omitted for clarity.

Figure 2

Mol­ecular structure of the title compound with displacement ellipsoids drawn at 30% probability level. Deuterium and C–bound hydrogen atoms are omitted for clarity. Disordered solvent mol­ecules are shown in only one orientation.