Received 16 March 2012
In the binuclear title complex, [Er2(C13H9N3O2)2Cl2(CH3OH)2], the entire molecule is generated by the application of inversion symmetry. Each ErIII ion is seven-coordinated by two O atoms and one N atom from one N-(2-oxidobenzylidene)pyridine-2-carbohydrazidate (L2-) ligand, one O atom and one N atom from the symmetry-related L2- ligand, one O atom of a methanol molecule and one chloride anion. The coordination geometry is based on a pseudo-pentagonal bipyramid. Linear supramolecular chains along  are formed in the crystal packing through O-HCl hydrogen bonds.
For complexes containing salicylaldehyde-2-pyridinecarboxyl-hydrazone and related ligands, see: Guo et al. (2011a,b); Bai et al. (2005, 2006); Wu et al. (2004); Milway et al. (2003). For the mechanism of the hydrolysis of salicylaldehyde thiosemicarbazone, see: Narang & Aggarwal (1974).
Data collection: SMART (Bruker, 2000); cell refinement: SAINT (Bruker, 2000); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: TK5069 ).
The author appreciates financial support from Yanan University (grant No. YD2011-20) and the Science and Technology Bureau of Yanan City (grant No. kn2009-16).
Bai, Y., Dang, D. B., Cao, X., Duan, C. Y. & Meng, Q. J. (2006). Inorg. Chem. Commun. 9, 86-89.
Bai, Y., Dang, D. B., Duan, C. Y., Song, Y. & Meng, Q. J. (2005). Inorg. Chem. 44, 5972-5974.
Bruker (2000). SADABS, SAINT and SMART. Bruker AXS Inc., Madison, Wisconsin, USA.
Guo, Y. N., Chen, X. H., Xue, S. F. & Tang, J. K. (2011a). Inorg. Chem. 50, 9705-9713.
Guo, Y. N., Xu, G. F., Wernsdorfer, W., Ungur, L., Guo, Y., Tang, J. K., Zhang, H. J., Chibotaru, L. F. & Powell, A. K. (2011b). J. Am. Chem. Soc. 133, 11948-11951.
Milway, V. A., Zhao, L., Abedin, T. S. M., Thompson, L. K. & Xu, Z. Q. (2003). Polyhedron, 22, 1271-1279.
Narang, K. K. & Aggarwal, A. (1974). Inorg. Chim. Acta, 9, 137-142.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Wu, W. S., Feng, Y. L., Lan, X. R. & Huang, T. T. (2004). Chin. J. Appl. Chem. 21, 135-139.