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- W2076455770 abstract "Various cinnamates serving as model compounds for poly(vinyl cinnamate), trans-ethyl (trans-ECi), trans-methyl (trans-MCi), cisethyl (cis-ECi) and trans,trans-1,3-trimethylene dicinnamate (trans,-trans-TMCi) were irradiated at concentrations of 1–5 × 10−5 mol litre−1 in chlorine-containing solvents (CH2Cl2, CCl4, 1,1,2-trifluorotrichloroethane) and chlorine-free solvents (per-fluoro-2-(n-butyl)-tetrahydrofurane, 1-ethoxy-2-acetoxy-ethane, PMMA). For trans-ECi the quantum yield φ (trans → cis) is higher in chlorine-free solvents (0·40–0·45) than in chlorine-containing solvents (c. 0·26). Fluorescence spectra, recorded with trans-ECi and trans, trans-TMCi possess two peaks at 325 nm and at 375 nm in chlorine-containing solvents and only one peak at 325 nm in chlorine-free solvents. The fluorescence lifetime (slow mode) at 325 nm is 15±5 ns and at 375 nm 25±5 ns. Flash photolysis experiments revealed S1 → Sn absorption spectra (lifetime 15±5 ns) in all solvents and with all solutes. In chlorine-containing solvents an additional long-lived absorption (lifetime 5–10 μs) was observed. From the results it is concluded that singlet-excited cinnamates form exciplexes of C-T character with the chlorine-containing solvents used in this work. Moreover, the results revealed—in accord with earlier findings—that upon direct excitation, cinnamates undergo chemical changes exclusively via electronically excited singlet states." @default.
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- W2076455770 date "1983-01-01" @default.
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- W2076455770 title "Photoreactions of trans-poly(vinyl cinnamate) and low molecular weight model compounds—Part I" @default.
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- W2076455770 doi "https://doi.org/10.1016/0144-2880(83)90047-7" @default.
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