2-ヒドロキシ-4’-メトキシカルコン/シリカ複合体のフォトクロミズム

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  • Photochromism of a 2-Hydroxy-4'-Methoxychalcone/Silica Composite

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A synthetic anthocyanin pigment, 2-hydroxy-4’-methoxychalcone (HMC), has the same molecular skeleton as plant pigments and promises to be practically applicable as a safe and environmentally friendly photochromic pigment. With the objective of using HMC in dry conditions, we prepared a composite of silica and HMC and investigated its photochromic properties. In order to maximize the adsorption of HMC onto silica, we prepared a HMC solution with UV-A irradiation at pH 3.7 in which HMC was mainly in the flavylium cation form. Unlike the HMC solution, the HMC/silica composite did not exhibit optical decoloring under UV-C irradiation : only coloration was observed under UV-A irradiation. On the other hand, decoloration occurred in the dark within five days, and occurred more readily at a higher temperature and higher humidity than normal.

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  • 色材協会誌

    色材協会誌 83 (7), 289-294, 2010

    一般社団法人 色材協会

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