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Dr. Chandana Karunatilaka, Dejan-Krešimir Bučar, Lindsay R. Ditzler, Dr. Tomislav Friščić, Dale C. Swenson, Prof. Dr. Leonard R. MacGillivray and Prof. Dr. Alexei V. Tivanski Softening and Hardening of Macro- and Nano-Sized Organic Cocrystals in a Single-Crystal Transformation Angewandte Chemie International Edition 50

Article first published online: 20 JUL 2011 | DOI: 10.1002/anie.201102370

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AFM nanoindentation was used to demonstrate that millimeter- and nanometer-sized organic cocrystals exhibit changes in the mechanical properties before, during, and after a single-crystal-to-single-crystal [2+2] photodimerization of olefins. Millimeter-sized crystals become 40 % softer, whereas nanocrystals of the same material become 40 % harder following the photoreaction.

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