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• W2332488493 abstract "We report the photochemistry of two ring-open isomers, namely TTC and TTT, of a bidirectional photoswitchable spiropyran, 6,8-dinitro-1′,3′,3′-trimethylspiro[2H-1-benzopyran-2,2′-indoline] (6,8-dinitro BIPS). Both isomers are capable of ring closure after excitation with visible fs laser pulses, as disclosed by pump-wavelength-dependent transient absorption experiments in the visible spectral range. The main isomer TTC has its maximum absorption at 560 nm, whereas the minor isomer TTT is red-shifted (600 nm). The excited-state lifetimes differ strongly (τ ≈ 900 ps for TTT and τ ≈ 95 ps for TTC), nevertheless the quantum efficiencies for ring closure (40% for TTC and 35% for TTT) and isomerization (1−2% for TTC and 1−2% for TTT) are comparable. With regard to the bidirectional photoswitching capabilities, 6,8-dinitro BIPS is the first molecular switch based on a 6π-electrocyclic reaction where both ring-open isomers are capable of ring closure." @default.
• W2332488493 created "2016-06-24" @default.
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• W2332488493 date "2011-01-19" @default.
• W2332488493 modified "2023-10-02" @default.
• W2332488493 title "Ring-Closure and Isomerization Capabilities of Spiropyran-Derived Merocyanine Isomers" @default.
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• W2332488493 doi "https://doi.org/10.1021/jp108322u" @default.
• W2332488493 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21247207" @default.
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