Volume 61, Issue 2 e202114089
Research Article

Correlating Reaction Dynamics and Size Change during the Photomechanical Transformation of 9-Methylanthracene Single Crystals

Kohei Morimoto

Kohei Morimoto

Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585 Japan

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Prof. Daichi Kitagawa

Corresponding Author

Prof. Daichi Kitagawa

Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585 Japan

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Prof. Fei Tong

Prof. Fei Tong

Department of Chemistry, University of California, Riverside, 501 Big Springs Road, Riverside, CA, 92521 USA

Present address: Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237 China

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Dr. Kevin Chalek

Dr. Kevin Chalek

Department of Chemistry, University of California, Riverside, 501 Big Springs Road, Riverside, CA, 92521 USA

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Prof. Leonard J. Mueller

Prof. Leonard J. Mueller

Department of Chemistry, University of California, Riverside, 501 Big Springs Road, Riverside, CA, 92521 USA

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Prof. Christopher J. Bardeen

Corresponding Author

Prof. Christopher J. Bardeen

Department of Chemistry, University of California, Riverside, 501 Big Springs Road, Riverside, CA, 92521 USA

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Prof. Seiya Kobatake

Corresponding Author

Prof. Seiya Kobatake

Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585 Japan

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First published: 11 November 2021
Citations: 39

Graphical Abstract

The development of a nonlinear kinetic model for crystal reactions allows us to quantify for the first time how the kinetics depend on sample morphology. Furthermore, the quantitative connection between molecular reaction kinetics and mechanical response in well-defined single crystals provides a new benchmark for analyzing these photomechanical materials.

Abstract

Photomechanical molecular crystals that expand under illumination could potentially be used as photon-powered actuators. In this study, we find that the use of high-quality single crystals of 9-methylanthracene (9MA) leads to more homogeneous reaction kinetics than that previously seen for polycrystalline samples, presumably due to a lower concentration of defects. Furthermore, simultaneous observation of absorbance and shape changes in single crystals revealed that the dimensional change mirrors the reaction progress, resulting in a smooth expansion of 7 % along the c-axis that is linearly correlated with reaction progress. The same expansion dynamics are highly reproducible across different single crystal samples. Organic single crystals exhibit well-defined linear expansions during 100 % photoconversion, suggesting that this class of solid-state phase change material could be used for actuation.

Conflict of interest

The authors declare no conflict of interest.

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