Fluorescence resonance energy transfer (FRET) sensitized emission of perylene by pyrene in a joint‐linker type gel is observed for the first time. The joint‐linker type organic‐inorganic hybrid gels containing pyrene and perylene synthesized from multi‐functional cyclic siloxane, 1,3,5,7‐tetramethylcyclotetrasiloxane (TMCTS), or cubic silsesquioxane, 1,3,5,7,9,11,13,15‐octakis(dimethylsilyloxy)pentacyclo‐[9,5,1,1,1,1]octasilsesquioxane (POSS), as joint molecules, and α,ω‐nonconjugated dienes, 1,5‐hexadiene (HD), or 1,9‐decadiene (DD), as linker molecules, are involved in a photo hydrosilylation reaction with a bis(acetylacetonato)platinum catalyst in a toluene solution of pyrene and perylene. FRET from pyrene (donor) to perylene (acceptor) in the gels is studied quantitatively. The FRET efficiencies (E) of gels containing 300 or 30 x 10–6 m of pyrene and perylene are about 0.6–0.8 or 0.5, respectively, independent of the monomer concentration. Sensitized acceptor emission is observed in the gels, especially in the gels containing 300 x 10–6 m of pyrene and perylene molecules. The ratio of the increase of the sensitized acceptor emission to the loss of donor fluorescence, the G factor, is determined to evaluate the efficiency of the sensitized emission of the acceptor in the gels. The G factors of the gels containing 300 or 30 x 10–6 m of pyrene and perylene molecules are 0.4–0.75 or 0.07‐0.1, repectively, and the gels with TMCTS or DD have a slightly higher G factor than gels with POSS or HD.
Front Cover: Fluorescence resonance energy transfer (FRET) sensitized emission of perylene by pyrene in a joint‐linker type organic‐inorganic hybrid gel is firstly observed. The present gels with controlled mesh size and homogeneous network should be usable as a molecular‐size flask to conduct photochemical reaction. Further details can be found in the article by Naofumi Naga,* Saki Hashimoto, Tomoharu Miyanaga, and Hidemitsu Furukawa on page 2671.
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