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Issue 24, 2017
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Solid-state photochromic behavior of pyrazolone 4-phenylthiosemicarbazones

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Solid-state photochromic materials have attracted much more attention due to their actual potential applications in photoactive devices. Here, three new compounds (1-phenyl-3-methyl-4-(3-fluoro/chloro/bromobenzal)-5-hydroxypyrazole 4-phenylthiosemicarbazones) were synthesized, which exhibited reversible solid state photochromic properties upon UV/Vis light irradiation. Their photochromic properties, first-order kinetics and fatigue resistance were investigated by time-dependent UV-Vis absorption spectroscopy. The results showed that their fatigue resistance and addressability were enhanced with the increase in the electron-withdrawing ability of the substituents on the phenyl group at the 4-position of the pyrazolone ring. Thus, 1-phenyl-3-methyl-4-(3-fluorobenzal)-5-hydroxypyrazole 4-phenylthiosemicarbazone exhibited good photochromic properties and high fatigue resistance. Based on single crystal X-ray diffraction and FT-IR analyses, the photochromic mechanism involved intra/intermolecular proton transfer.

Graphical abstract: Solid-state photochromic behavior of pyrazolone 4-phenylthiosemicarbazones

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Publication details

The article was received on 08 Sep 2017, accepted on 01 Nov 2017 and first published on 02 Nov 2017

Article type: Paper
DOI: 10.1039/C7NJ03406G
Citation: New J. Chem., 2017,41, 15229-15235

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    Solid-state photochromic behavior of pyrazolone 4-phenylthiosemicarbazones

    Y. Che, L. Liu, Y. Tang, Y. Qiao, X. Zhao, S. Gao, S. Ding and D. Jia, New J. Chem., 2017, 41, 15229
    DOI: 10.1039/C7NJ03406G

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