Studies on solid-state proton transfer along hydrogen bond of pyrazolone-ring |
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Authors: | Bang-hua Peng |
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Institution: | Institute of Applied Chemistry, Xinjiang University, Urumqi, 830046, People's Republic of China |
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Abstract: | Evidence from the time-dependent UV-vis reflection spectra studies indicates the compound 1-phenyl-3-methyl-4-(4-methylbenzal)-5-pyrazolone 4-ethylthiosemicarbazone (PM4MBP-ETSC) undergoes a solid-state photochromism. The reaction rate constant was studied by the first-order kinetics curves. X-ray single crystal structural analysis shows that the pyrazolone-ring stabilizes in the keto form. The conclusion can be made that its photochromism in crystalline is associated with a photoinduced proton transfer reaction (inter- and intra-molecular hydrogen transfer) along hydrogen bond leading to a colored tautomer as the compound crystallizes in H-bonded supramolecular configuration. |
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Keywords: | Thiosemicarbazone Photochromism Crystal structure Proton transfer |
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