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- W2036834904 abstract "Abstract A series of p -nitro substituted trans -diphenylbutadienes is synthesized and their photophysical and photochemical properties are investigated. All the dienes have a very low quantum yield of fluorescence but exhibit remarkable solvatochromic emission shifts attributed to twisted intramolecular charge transfer. Photochemical irradiation of simple p -nitro substituted diphenylbutadienes reveals inefficient or no detectable photoisomerization. However, substituting a methyl group on the butadiene chain of p -nitro substituted diphenylbutadiene or replacing the nitro group with cyano group yields the corresponding trans – cis isomers. In the case of simple nitrodienes, strong intramolecular charge transfer character in the excited state aids dissipation of absorbed energy through non-photochemical and non-radiative channels. The steric effect caused by the presence of methyl group lowers the isomerization barrier in methyl substituted dienes leading to a regioselective isomerization." @default.
- W2036834904 created "2016-06-24" @default.
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- W2036834904 date "2014-11-01" @default.
- W2036834904 modified "2023-09-29" @default.
- W2036834904 title "Selective photoisomerization of methyl substituted nitro diphenylbutadienes" @default.
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- W2036834904 doi "https://doi.org/10.1016/j.jphotochem.2014.07.019" @default.
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