Crystal Structure of a Lantern-Type Dirhodium(II) Complex with a cis-(2:2) Arrangement of Two Formamidinato and Two Trifluoroacetato Bridges

摘要

The title compound of a lantern-type rhodium(II) dinuclear complex, cis-[Rh₂(3,5-Me₂-pf)₂(O₂CCF₃)₂(H₂O)₂]·0.5C₆H₁₄ (3,5-Me₂-pf- = N,N′-bis(3,5-dimethylphenyl)formamidinate anion), was isolated and the crystal structure was determined by the single-crystal X-ray diffraction method at 90 K. It crystallizes in the triclinic space group P1 with a = 11.4725(16)Å, b = 12.4679(17)Å, c = 16.113(2)Å, α = 77.391(2)°, β = 75.265(2)°, γ = 85.548(2)°, V = 2174.6(5)Å3, D_x = 1.548 g/cm3, and Z = 2. The R1 [I 2σ(I)] and wR2 (all data) values are 0.0275 and 0.0625, respectively, for all 9465 independent reflections. The cis-(2:2) arrangement of the 3,5-Me₂-pf and trifluoroacetato ligands within the dinuclear core was confirmed, the axial sites of the dimer being occupied by the water molecules. The Rh-Rh distance is 2.4538(4)Å and the axial Rh-O (H₂O) distances are 2.3309(16) and 2.3196(16)Å.