On again, off again: The reversible expansion and contraction of single crystals of [Cu(TCNQ)] induced by near-infrared laser pulses was studied with ultrafast electron microscopy (TCNQ=7,7,8,8-tetracyanoquinodimethane). The crystal expands along the π-stacking axis of the TCNQ molecules, but not perpendicular to this axis, when exposed to light. The crystal returned to its original structure when the laser light was blocked.
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