The highly-polymorphic, strongly-coloured ‘ROY’ system exhibits a yellow → orange → red piezochromic response under hydrostatic compression. The ‘Y’ (yellow) polymorph accommodates the effect of pressure via a wine-rack-type mechanism, made accessible by the conformational flexibility of the molecule, while retaining the crystal symmetry of the parent Y form. Decompression from 1.49 GPa demonstrates reversibility of this behaviour.
E. L. Harty, A. R. Ha, M. R. Warren, A. L. Thompson, D. R. Allan, A. L. Goodwin and N. P. Funnell, Chem. Commun., 2015, 51, 10608 DOI: 10.1039/C5CC02916C
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