*Acta Cryst.* (2012). E**68**, m1408-m1409

[ doi:10.1107/S1600536812043528 ]

### Di--carbonyl-bis[bis(triphenylphosphane)rhodium(0)](*Rh*-*Rh*) acetone disolvate

### P. G. Gueorguieva, S. A. Laneman, G. G. Stanley, F. R. Fronczek and S. F. Watkins

**Abstract: **The dirhodium complex, [Rh_{2}(C_{18}H_{15}P)_{4}(CO)_{2}]·2(CH_{3})_{2}CO, has crystallographic twofold symmetry and the Rh-Rh distance is 2.6266 (8) Å. The four atoms proximate to each Rh atom [Rh-P = 2.3222 (7) and 2.3283 (8) Å, and Rh-C = 1.961 (3) and 2.045 (3) Å] form a distorted tetrahedron with large deviations from the putative tetrahedral angles [r.m.s. deviation = 23 (1)°]. The six angles more closely approximate those of a trigonal bipyramid [r.m.s. deviation = 14 (1)°] with one missing equatorial ligand. The two bridging carbonyl ligands are much more linearly coordinated to one Rh [Rh-CO = 151.0 (2)°] than to the other [127.0 (2)°], and the two Rh_{2}CO planes form a dihedral angle of 45.43 (5)°. The two acetone solvent molecules are disordered, and their estimated scattering contribution was subtracted from the observed diffraction data using the SQUEEZE routine in *PLATON* [Spek (2009). *Acta Cryst.* **D65**, 148-155].

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