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Surface‐enhanced Raman scattering of cis ‐ and trans ‐4‐methoxycinnamonitrile (4MCN) was investigated in aqueous silver sols. Both isomers adsorbed on the silver surface via the cyano group. The adsorption strength for the cis isomer appeared to be greater than that for the trans isomer. However, cis ‐4MCN, adsorbed selectively on the silver surface, was readily converted to the trans isomer via a laser‐assisted surface reaction. The exact mechanism of the photoisomerization is not yet completely understood. It is thought that the reaction occurs via the absorption of a single visible photon which is in resonance with the low‐energy tail of the broadened absorption band of the adsorbed cis isomer.
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Chun et al. (1990) studied this question.
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