Research Article: (2,2′-Bipyridine-6,6′-dicarboxyl­ato-κ3N,N′,O6)(6′-carb­oxy-2,2′-bipyridine-6-carboxyl­ato-κ3N,N′,O6)rhodium(III)

Date Published: March 01, 2012

Publisher: International Union of Crystallography

Author(s): Huimin Wang, Xiaojun Gu, Bingbing Zhang, Haiquan Su, Ming Hu.


The RhIII ion in the title compound, [Rh(C12H6N2O4)(C12H7N2O4)], is coordinated by four N atoms and two O atoms from two chelating ligands L and HL (H2L = 2,2′-bipyridine-6,6′-dicarb­oxy­lic acid) to form a distorted octa­hedral geometry. Face-to-face π-stacking inter­actions are observed between inversion-related pyridine rings, with a centroid-to-centroid distance of 3.581 (1) Å [the perpendicular distance between the rings is 3.3980 (7) Å]. Inter­molecular O—H⋯O hydrogen bonds link adjacent mol­ecules into one-dimensional supra­molecular chains along the c axis, while several inter­molecular C—H⋯O inter­actions are also observed.

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For structures and photophysical properties of LnIII (Ln is a lanthanide) complexes with the title ligand, see: Bünzli et al. (2000 ▶). For Rh complexes with pyridyl triazole ligands, see: Burke et al. (2004 ▶). For an Mn–Rh coordination polymer with the 2-methyl­pyrazine-5-carb­oxy­lic acid ligand, see: Chapman et al. (2002 ▶). For a catena-poly diaqua CdII complex with the title ligand, see: Knight et al. (2006 ▶). For a review reporting the properties of coordination polymer networks via O and N atoms, see: Robin & Fromm (2006 ▶). For the structures and thermal properties of five Ln complexes with the title ligand, see: Wang et al. (2010 ▶). For a related NiII complex with the title ligand, see: Wang et al. (2009 ▶).