Chiral Crystals of an Achiral Molecule Exhibit Plastic Bending and a Crystal-to-Crystal Phase Transition

Maahs Adam C.; Ignacio Melissa G.; Ghazzali MohamedSoldatov Dmitriy V.Preuss Kathryn E.

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Chiral Crystals of an Achiral Molecule Exhibit Plastic Bending and a Crystal-to-Crystal Phase Transition

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The achiral molecule 2-cyano-4,6-dimethylpyrimidine (Me(2)pmCN) meets simple criteria that predict a supramolecular arrangement capable of exhibiting plastic bending. Indeed, crystals grown by sublimation bend readily without breaking under manual manipulation at room temperature. Compression of a crystal perpendicular to the bending direction easily "squashes" the crystal, a mechanical response akin to metal-like malleability. Single crystal X-ray diffraction (XRD) study reveals net alignment of the molecular dipoles propagating along the 2(1) screw axis in the monoclinic space group P2(1). Columnar,pi-stacked arrays of the planar molecules extend in 100, the long axis of the crystals. Weak interactions between the columnar structures account for the observed mechanical behavior. Variable temperature powder XRD and differential scanning calorimetry measurements of the plastic crystals indicate a solid-to-solid phase transition from one crystalline phase to another at 80.7 degrees C prior to melting at 83.3 degrees C.

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《Crystal growth & design》 |2017年第3期|1390-1395|共6页
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Maahs Adam C.; Ignacio Melissa G.; Ghazzali MohamedSoldatov Dmitriy V.Preuss Kathryn E.;
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Univ Guelph, Dept Chem, Guelph, ON N1G 2W1, Canada;

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正文语种英语
中图分类晶体学;
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Chiral Crystals of an Achiral Molecule Exhibit Plastic Bending and a Crystal-to-Crystal Phase Transition

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