Received 15 November 2011
aKey Laboratory of Eco-Environment-Related Polymer Materials of the Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
Correspondence e-mail: firstname.lastname@example.org
The asymmetric unit of the title compound, C20H24N2, contains one half -molecule which exhibits a crystallographically imposed center of symmetry. The benzene rings are inclined to the 1,4-diazabutadiene mean plane by 78.3 (2)°.
The title compound was synthesized as a -diimine ligand for NiII--diimine olefin polymerization catalysts. For applications of -diimine ligands, see: Johnson et al. (1995); Killian et al. (1996). For the design and synthesis of new -diimine derivatives, see: Yuan et al. (2005); Popeney & Guan (2005, 2010); Popeney et al. (2011). The crystal structures of Re and Ni complexes with the title ligand were reported by Kia et al. (2005) and Yuan et al. (2011), respectively.
Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); 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: CV5204 ).
We thank the National Natural Science Foundation of China (grant No. 20964003) for funding. We also thank the Key Laboratory of Eco Environment-Related Polymer Materials of the Ministry of Education and Key Laboratory of Polymer Materials of Gansu Province (Northwest Normal University) for financial support.
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