Photodimerization of Coumarin‐Derived Pentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane to Fabricate a Three‐Dimensional Organic–Inorganic Hybrid Material

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An organic–inorganic hybrid material was prepared from a pentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane bearing eight coumarin groups. The coumarin groups were photodimerized by UV‐light irradiation to connect the monomer units of the octasiloxane. Using a concentrated solution, the intermolecular photodimerization of these coumarin groups leaded to the cross‐linking of the octasiloxane, fabricating an organic–inorganic hybrid material with a three‐dimensional nanostructure. Whereas in dilute solution the intramolecular photodimerization was preferred to the intermolecular reaction, resulting in no formation of polymeric material.