Crystal Structures of (1,5-Cyclooctadiene)di-μ-methoxo-dirhodium(I) and Tetrakis(η3-allyl)di-μ-hydroxo-dirhodium(III)

Abstract

The crystal structures of (1,5-cyclooctadiene)di-μ-methoxo-dirhodium(I) and tetrakis(η3-allyl)di-μ-hydroxodirhodium(III) were determined by the X-ray method. The former belongs to the triclinic space group P\bar1 with cell dimensions, a=7.347(4), b=6.471(3), c=9.554(6) Å, α=87.06(4), β=82.50(5) and γ=77.98(4)°. The space group of the latter is also P\bar1 but two crystallographically independent molecules exist in a cell with dimensions, a=11.704(7), b=9.793(6), c=7.948(5) Å, α=113.49(5), β=54.59(5), and γ=110.99(5)°. Both structures were determined by the heavy atom method and refined by the block-diagonal least-squares method. The final R values were 0.054 for the former and 0.075 for the latter. The coordination of the rhodium atom in the former compound is square planar, the cyclooctadiene ligand being regarded as a bidentate donor. The latter coordination is, in a formal sense, octahedral.