Slow Interfacial Electron Hole Transfer of a trans-Stilbene Radical Cation Photoinduced in a Channel of Nonacidic Aluminum Rich ZSM-5 Zeolite

trans-Stilbene (t-St) is incorporated as an intact molecule without solvent in the medium size channel of nonacidic aluminum rich Na6.6ZSM-5 zeolite with Na6.6(SiO2)89.4(AlO2)6.6 formula per unit cell. The interaction between Na+ cation and t-St occurs through one phenyl group facially coordinated to the Na+ cation near the O atoms binding Al atoms. The similarity between Raman spectra of t-St in solution and occluded in Na6.6ZSM-5 shows that the motion of t-St in the channel approaches at room temperature the isotropic limit characteristic of a liquid. The laser UV (266 nm) photoionization generates a primary t-St•+-electron pair as a fast phenomenon. These charge carriers exhibit lifetimes that extend over less than 1 h at room temperature and disappear according to two parallel competitive ways:  direct charge recombination and electron transfer. This subsequent electron-transfer takes place between the electron deficient radical cation (t-St•+) and the electron donor oxygen atom of the zeolite framewo...

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