Abstract
The surface enhancement factors of resonance Raman scattering (RRS) of Cu(II) 5,10,15,20-tetrakis(1-methyl-4-pyridyl)-porphyrin (CuP) were calculated as the concentration-corrected intensity ratios of the surface-enhanced RRS (SERRS) and RRS spectra obtained at excitation wavelengths of 441.6 nm and 457.9 nm. These excitations fall into the onset of both the Soret absorption band of CuP ( λ max = 424 nm) and the surface plasmon absorption (SPA) band of non-aggregated Ag colloid/CuP systems from which the SERRS spectra were acquired. The SERRS/RRS enhancement factors were precisely determined using the OH stretching vibrational band of bulk water as an internal intensity standard to normalize both SERRS and RRS spectra. The surface enhancement factors of individual porphyrin modes were dependent on the excitation wavelength and varied from 10 2 to 10 3, illustrating a considerable decrease in the surface enhancement factor in the case of molecular resonance excitations.
Published Version
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