Photoionization of tetraphenylporphyrin in mesoporous SiMCM-48, AlMCM-48, and TiMCM-48 molecular sieves

被引：19

作者：

Chang, ZX ^{[1
]}

Kevan, L ^{[1
]}

机构：

[1] Univ Houston, Dept Chem, Houston, TX 77204 USA

来源：

LANGMUIR | 2002年 / 18卷 / 03期

关键词：

D O I：

10.1021/la011414o

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Electron spin resonance spectroscopy has been used to detect the photoionization yield of meso-tetraphenylporphyrin (H2TPP) in SiMCM-48, AlMCM-48, and TiMCM-48 mesoporous molecular sieves. MCM-48 materials are shown to be effective heterogeneous hosts to accomplish long-lived photoinduced electron transfer of bulky porphyrin molecules at room temperature. TiMCM-48 and AlMCM-48 have higher photoyields of H2TPP(+) radicals than does SiMCM-48, indicating that the incorporation of Al and Ti into MCM-48 frameworks enhances the electron-accepting ability of the framework. H2TPP+ radicals are more stable in TiMCM-48 than in SiMCM-48 and AlMCM-48.

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收藏

页码：911 / 916

页数：6

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