Photooxidation of alkylphenothiazines in SiMCM-48, AlMCM-48 and VMCM-48 mesoporous molecular sieves

被引：16

作者：

Chang, ZX ^{[1
]}

Krishna, RM ^{[1
]}

Xu, J ^{[1
]}

Koodali, R ^{[1
]}

Kevan, L ^{[1
]}

机构：

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

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2001年 / 3卷 / 09期

关键词：

D O I：

10.1039/b008247n

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Phenothiazine derivatives were introduced into SiMCM-48, AlMCM-48 and VMCM-48 mesoporous molecular sieves by impregnation. Alkylphenothiazine cation radicals (PCn+) were generated by photooxidation within MCM-48 samples and characterized by EPR and diffuse reflectance UV-VIS spectroscopy. A series of VMCM-48 and AlMCM-48 mesoporous molecular sieves with different metal contents were synthesized hydrothermally and increased the PCn+ cation radical photoyield compared with SiMCM-48. The photooxidation efficiency to form PCn+ cation radicals increases in the order SiMCM-48 < AlMCM-48 < VMCM-48. Increasing the alkyl chain length affects the alkylphenothiazine cation radical photoyield and stability. PCn+ cation radicals are stable in MCM-48 samples at room temperature from several hours to several days. Mesoporous MCM-48 molecular sieves are shown to be effective heterogeneous hosts to achieve long-lived photoinduced electron transfer of PCn molecules at room temperature.

引用

页码：1699 / 1704

页数：6

共 45 条

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