Received 15 October 2012
The asymmetric unit of the title compound, [RuCl2(C6H6)(C18H27P)]·1.5C6H6, contains one molecule of the RuII complex and one and a half solvent molecules as one of these is located about a centre of inversion. The RuII atom has a classical three-legged piano-stool environment being coordinated by an 6-benzene ligand [Ru-centroid = 1.6964 (6) Å], two chloride ligands with an average Ru-Cl bond length of 2.4138 (3) Å and a dicyclohexylphenylphosphane ligand [Ru-P = 2.3786 (3) Å]. The effective cone angle for the phosphane was calculated to be 158°. In the crystal, weak C-HCl hydrogen bonds link the RuII complexes into centrosymmetric dimers. The crystal packing exhibits intra- and intermolecular C-H interactions resulting in a zigzag pattern in the  direction.
For background to the catalytic activity of RuII-arene complexes, see: Chen et al. (2002); Crochet et al. (2003); Aydemir et al. (2011); Wang et al. (2011). For ring-opening metathesis polymerization with Ru-arene complexes, see: Stumpf et al. (1995). For background to cone angles, see: Tolman (1977); Otto (2001). For a description of the Cambridge Structural Database, see: Allen (2002).
Data collection: APEX2 (Bruker, 2011); cell refinement: SAINT (Bruker, 2008); data reduction: SAINT and XPREP (Bruker, 2008); program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg & Putz, 2005); software used to prepare material for publication: publCIF (Westrip, 2010) and WinGX (Farrugia, 1999).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: CV5349 ).
Financial assistance from the Research Fund of the University of Johannesburg is gratefully acknowledged.
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