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BP2VA exhibited spectacular luminescence characteristics: grinding and the exertion of external pressure on the powder led to a change in its photoluminescence color from green to red. Three crystal polymorphs of BP2VA with different stacking modes involving gradually enhanced p–p interactions in the three crystalline states provided further insight into the origin of luminescence changes under the external stimulae. BP2VA was synthesized in a straightforward manner by a one-stepWitting–Horner reaction according to a previously reported method,[4] and the purified material was characterized by spectroscopic methods (see the Supporting Information). |
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