The benzofuranoquinol clathrate host exhibits color and fluorescence changes upon exposure to various gaseous amines both in the crystalline state and in the thin-film state. The decrease of long-wavelength absorption and the dramatic fluorescence enhancement with blue-shift of emission maximum depending on the enclathrated amine molecules were observed. The response time for the optical sensing was greatly improved by using the host in the thin-film state.
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Yoshida et al. (2000) studied this question.
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