Received 27 September 2012
In the title compound, [Re2(CH3O)2(CO)6(C4H6N3O)], the two ReI atoms are linked by a methoxo and methanolato bridge, as well as by a creatinine ligand that coordinates in a bidentate fashion. Three fac-carbonyl ligands occupy the rest of the slightly distorted octahedral geometry around each ReI atom. The bridging methanolato and methoxo ligands are bent out of the Re2O2 plane by 49.2 (4) and 47.8 (3)° respectively. This is normally associated with a methanolato-bridging-type coordination rather that the more planar methoxo-type bridging. Furthermore, the creatinine bridging molecule is very slightly distorted from the Re2N2C plane, indicating that the pyrazolo N atom bonded to the RhI atom is not protonated. Charge balance can thus only be attained if one assumes a positional disorder for the methanolato/methoxo H atom. All attempts to locate disordered protons around these O atoms were unsuccessful. Four hydrogen bonds, one N-HO and three C-HO, are observed in the structure. The molecules pack in a head-to-head and tail-to-tail fashion when viewed along the c axis, in alternating columns.
For the synthesis of the starting material, see: Alberto et al. (1996). For similar ReI methoxy-bridged structures, see: Franklin et al. (2008); Klausmeyer & Beckles (2006). For structures of creatinine, see: Bell et al. (1995); du Pré & Mendel (1955). For structures with creatinine as a monodentate ligand, see: Canty et al. (1979); Mitewa et al. (2002); Matos Beja et al. (1991); Panfil et al. (1995). For a tetranuclear ReI complex, see: Schutte et al. (2012a). For similar ReI structures, see: Schutte et al. (2011, 2012b,c).
Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT-Plus (Bruker, 2008); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg & Putz, 2005); software used to prepare material for publication: WinGX (Farrugia, 1999).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: TK5155 ).
Leo Kirsten is thanked for the data collection. The University of the Free State, the Department of Chemistry, the NRF and Sasol Ltd are gratefully acknowledged for funding.
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