Crystal structures of triorganophosphinegold(I) O-cyclohexyldithiocarbonates: R3PAu(S2CO-c-C6H11), R = Et, Ph and c-hexyl

George Siasios and Edward R. T. Tiekink


The crystal structures of the title compounds R3PAu(S2CO-c-C6H11), R = Et, Ph and c-hexyl, have been determined at room temperature. Monoclinic crystals of the R = Et compound have space group C2/c with unit cell dimensions a = 26.754(4) Å, b = 7.264(1) Å, c = 18.928(3) Å, β = 102.04(1)°, Z = 8 and Dx = 1.811 Mg m−3. Crystals of the R = Ph structure are triclinic with space group P[unk] and unit cell dimensions a = 11.372(2) Å, b = 13.053(6) Å, c = 9.488(3) Å; α = 109.45(3)°, β = 99.19(2)°, γ = 106.28(3)°, Z = 2 and Dx = 1.722 Mg m−3. The R = c-hexyl compound crystallizes in the orthorhombic space group P212121 with unit cell dimensions a = 8.121(1) Å, b = 11.108(4) Å, c = 30.212(5) Å,Z = 4 and Dx = 1.591 Mg m−3. The structures were refined by a full-matrix least-squares procedure on 1908 reflections to final R = 0.039 for the R = Et compound, 3664 reflections and R = 0.055 for R = Ph and 1501 reflections and R = 0.040 for R = c-hexyl. The Au atom in each of the structures is linearly coordinated by the S atom, derived from a monodentate xanthate ligand, and the P atom. Different orientations of the xanthate ligands results in two structural forms. For the R = Et and Ph compounds the O atom is in close proximity of the Au atom whereas for the R = c-hexyl compound the S atom is orientated towards the Au atom. The different structures are rationalized in terms of the steric demands of the phosphine ligands. A close Au … Au interaction of 3.120(1) Å is found in the R = Et compound; no such contacts are observed in the R = Ph and c-hexyl structures.

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Zeitschrift für Kristallographie – Crystalline Materials offers a place for researchers to present results of their crystallographic studies. The journal includes theoretical as well as experimental research. It publishes Original Papers, Letters and Review Articles in manifold areas of crystallography.