A simple donor-acceptor linked dyad, 9-mesityl-10-methylacridinium ion (Acr þ -Mes) was incorporated into nanosized mesoporous silica-alumina to form a composite, which in acetonitrile is highly dispersed. In this medium, upon visible light irradiation, the formation of an extremely long-lived electron-transfer state (Acr • -Mes •þ ) was confirmed by EPR and laser flash photolysis spectroscopic methods. The composite of Acr þ -Mes-incorporated mesoporous silica-alumina with an added copper complex [ðtmpaÞCu II ]ðClO 4 − Þ 2 (tmpa ¼ trisð2-pyridylmethylÞamine) acts as an efficient and robust photocatalyst for the selective oxygenation of p-xylene by molecular oxygen to produce p-tolualdehyde and hydrogen peroxide. Thus, incorporation of Acr þ -Mes into nanosized mesoporous silica-alumina combined with an O 2 -reduction catalyst (½ðtmpaÞCu II 2þ ) provides a promising method in the development of efficient and robust organic photocatalysts for substrate oxygenation by dioxygen, the ultimate environmentally benign oxidant.copper complex catalyst | donor-acceptor dyad | nanosized silica-alumina | p-xylene | photoinduced electron transfer

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