SURFACE-ENHANCED RESONANCE RAMAN-SPECTROSCOPY OF HYPERICIN AND EMODINON SILVER COLLOIDS - SERRS AND NIR FTSERS STUDY

SERS, SERRS and NIR FTSERS of emodin and hypericin are reported for th e first time on aqueous silver colloid. Intense SERRS spectra can be o btained when using excitation lines at 514 nm for emodin and 598 nm fo r hypericin. FTIR and NIR FTRaman spectra from these molecules and the ir model compounds, anthrone and bianthrone, were recorded to assist i n the assignment of the SERS bands. From the analysis of the SERS spec tra a different orientation for each molecule can be deduced. (C) 1995 John Wiley & Sons, Inc.