The surface‐enhanced Raman scattering (SERS) of uracil, uridine, 2′‐deoxyuridine and 5′‐rUMP adsorbed on aqueous silver sol was investigated. Uracil was found to adsorb as the N‐3 deprotonated form, which underwent a reorientation from the situation where the base was perpendicular to the surface to the situation where the base lay flat on the surface as the surface charge was made more negative. The N‐3 deprotonated molecules of uridine, 2′‐deoxyuridine and 5′‐rUMP were found to lie flat on the silver surface regardless of the bulk concentration and the silver surface charge.
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Oh et al. (1988) studied this question.
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