X. Wang et al. / Journal of Molecular Structure 938 (2009) 185–191
191
Appendix A. Supplementary data
CCDC numbers 711653, 711654 and 711655 contain the supple-
mentary crystallographic data for 1, 2 and 3, respectively. These
data can be obtained free of charge from the Cambridge Crystallo-
Supplementary data associated with this article can be found, in
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We gratefully acknowledge the financial support by the Na-
tional Natural Science Foundation of China (Nos. 20671082 and
20971110), NCET and the Outstanding Talents Foundation by the
Henan Province.