Received 2 December 2012
The title compound, C13H13NO2, was previously described in space group P21/c by He et al. [Acta Cryst. (1993), C49, 2000-2002]. The ethyl group is disordered over two sets of sites in a 0.615 (10):0.385 (10) ratio. The C-O-C-C torsion angles containing the ethyl group are -111.6 (10) and 177.9 (7)°, while in the previously reported polymorph, the torsion angle is -167.3 (2)°. The molecules pack to form a three-dimensional structure in the ABAB style along the c-axis direction in the title compound, but parallel to the a-axis direction in the reported polymorph.
For the first polymorph, see: He et al. (1993). For background to intramolecular charge-transfer molecules and their use in the construction of one- to three-dimesional organic nanostructures, see: Zhang et al. (2007); Zhang et al. (2008).
Data collection: APEX2 (Bruker, 2002); cell refinement: SAINT (Bruker, 2002); 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: AA2081 ).
We gratefully acknowledge the NSFC(21101001), and the 211 Project of Anhui University for supporting this study.
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Zhang, X. J., Zhang, X. H., Wang, B., Zhang, C. Y., Chang, J. C., Lee, C. S. & Lee, S. T. (2008). J. Phys. Chem. C, pp. 16264-16268.
Zhang, X. J., Zhang, X. H., Zou, K., Lee, C. S. & Lee, S. T. (2007). J. Am. Chem. Soc. 129, 3527-3532.