A surface-enhanced Raman spectroscopic study of novel photochromic benzodithiacrown ether styryl dyes

Add time:08/12/2019    Source:sciencedirect.com

Surface-enhanced Raman scattering (SERS) and surface-enhanced resonance Raman scattering (SERRS) spectra of two benzothiazolium styryl dyes containing a crown ether ring with sulfur and oxygen heteroatoms have been obtained at low concentration (10−5–10−7 M) in the presence of silver colloids. A preliminary assignment of the observed bands to particular vibrational modes has been made by comparison of infrared (IR), normal Raman (R) and SERS data obtained from thiacrown ether and benzothiazolium molecular fragments with SERRS spectra of a benzothiazolium styryl dye containing a normal crown ether ring and with assignments reported previously for related molecules. The results indicate that the sulfur atoms of both the benzothiazolium and the dithiacrown ether groups participate in adsorption at the silver surface; possible models of adsorption of these dyes and their fragments are discussed.

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