Add time:08/03/2019         Source:sciencedirect.com

The crystal structures of chloro(trimethylphosphine)gold(I), chloro(tri-ipropylphosphine)gold(I) and bis(trimethylphosphine)gold(I) chloride · 2CHCl3 have been determined by single crystal X-ray diffraction studies. The monomeric units of the molecular complexes (Me3P)AuCl (1) and (iPr3P)AuCl (2) have linear PAuCl axes. However, the monomers of (Me3P)AuCl are aggregated to form a helical chain through fairly short alternating Au ⋯ Au contacts of 327.1(1), 335.6(1), and 338.6(1) pm and AuAuAu angles of 141.6(1), 141.8(1) and 141.9(1)°. By contrast, the monomers of compound 2 show no such Au ⋯ Au contacts in the lattice. This distinction between the two structures of the two analogous species is attributed to the different steric requirements of the phosphines. The crystals of bis(trimethylphosphine)gold (I) chloride (3)·2CHCl3 consist of layers of (Me3P)2AuCl complexes separated by layers of solvent molecules. The PAuP coordination is almost linear, with a chlorine atom at right angles (AuCl = 316.7(1) pm, ClAuP = 92.3(1)°).

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