State Key Laboratory of Crystal Materials,Shandong University, Jinan, Shandong 250100,P. R. China
J. Am. Chem. Soc.,2014,136(2), pp 590–593
Publication Date (Web): December 27, 2013
Copyright © 2013 American Chemical Society
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| SCSC phase transition process with the (001) plane of FormII as pressure-bearing surface. |
We report here a new polymorph of cocrystal CuQ2-TCNQ that shows an oriented single-crystal-to-single-crystal phase transition along itsa-axis at ambient conditions. Upon mechanical stimulation, it converts into another polymorph accompanied by almost doubling its length and halving its thickness. Our crystallographic studies indicate the dramatic changes in crystal dimensions resulted from the prominent changes of molecular stacking patterns. A reasonable mechanism for the phenomenon was proposed on the basis of the structural, microscopic, and thermal analysis.
