Received 29 April 2013
In the title compound, [Ba(C10H15)2(C10H8N2)], the Ba-N distances are 2.798 (3) and 2.886 (3) Å, and the Cp ring centroid distances to Ba2+ are 2.7291 (7) and 2.7192 (9) Å. The angle between the N atoms in the bypyridine ligand and the metal ion is 56.80 (8)° and the N-C-C-N torsion angle in the bipyridine ligand is 1.7 (4)°. The bipyridine ligand is almost planar, the dihedral angle formed by the intersection of the planes defined by the pyridyl rings being 3.04 (19)°, and the angle between the plane defined by the Ba2+ ion and the two bipyridyl N atoms and the plane defined by the 12 atoms of the bipyridine ligand is 10.2 (3)°. The average Ba-N and Ba-centroid distances are 0.16 and 0.14 Å longer, respectively, than the equivalent distances in the isotypic strontium compound [Kazhdan et al. (2008). Acta Cryst. E64, m1134]. This difference is in accord with the difference between the ionic radii of 0.16 Å suggested by Shannon [Acta Cryst. (1976), A32, 751-767].
Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-32 (Farrugia, 2012); software used to prepare material for publication: WinGX (Farrugia, 2012).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HP2057 ).
The authors thank Dr Fred Hollander, Dr Antonio DiPasquale and Professor Richard Andersen. This work was supported by the Director, Office of Science, Office of Basic Energy Sciences, and the Division of Chemical Sciences, Geosciences and Biosciences of the US Department of Energy under contract No. DE-AC02-05CH11231.
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Kazhdan, D., Hu, Y.-J., Kokai, A., Levi, Z. & Rozenel, S. (2008). Acta Cryst. E64, m1134.
Schultz, M., Boncella, J. M., Berg, D. J., Tilley, T. D. & Andersen, R. A. (2002). Organometallics, 21, 460-472.
Shannon, R. D. (1976). Acta Cryst. A32, 751-767.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.