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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
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Chang et al. (2001) studied this question.
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