K. Kamitani, M. Uo, H. Inoue, A. Makishima, T. Suzuki, K. Horie
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Synthesis and Spectroscopy of TPP Derivative-Doped Silica Gels by Sol-Gel Process
We have reported the incorporation of the photochemical hole-burning (PHB) dyes to the silica gels and the observation of spectral holes [1-3]. The porphyrins are well-known PHB dyes. However, in acidic solutions, many porphyrins change their forms into dication which is inactive in PHB [4]. So we have developed two-step sol-gel processes from the hydrolysis of TMOS with NaOH, and successfully incorporated free-base TPPS, a kind of porphyrin, in the silica gels [5].
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