Synthesis and crystal structure of tri(μ-carbonyl)bis[methyltris(1-pyrazolyl)gallato]dirhodium – benzene (1:1)
The synthesis, physical properties, and crystal structure of the dirhodium species [MeGa(N2C3H3)3]2Rh2(μ-CO)3 containing three carbonyl bridges are reported. Crystals of tri(μ-carbonyl)bis[methyltris(1-pyrazolyl)gallato]dirhodium – benzene (1:1) are monoclinic, a = 11.660(4), b = 15.2917(7), c = 11.750(4) Å, β = 119.09(1)°, Z = 2, space group P21. The structure was solved by conventional heavy-atom techniques and was refined by full-matrix least-squares procedures to R = 0.030 and Rw = 0.033 for 2604 reflections with I ≥ 3σ(I). The molecule contains a Rh—Rh single bond of 2.5818(8) Å bridged by three CO ligands, the overall molecular symmetry being close to D3h. Other important mean structural parameters are: Rh—C = 2.007(10), Rh—N = 2.181(14) Å, Rh—C—Rh = 80.1(5)°, and Rh—C—O = 140.0(7)°.