Silver complexes Raman spectra

These considerations, however, cannot exclude the possibility that a vibration of a pyridine-halide-metal (atom or surface) complex is responsible for the debated Raman feature. This would explain the shift of the frequency from that of a metal-halide frequency, the stability to cathodic potentials" (and, perhaps, the relative insensitivity to the metal itself). One should mention in this context that Krasser et reported a band at 240 cm in the Raman spectrum of pyridine-silver cluster complexes, which they associate with a pyridine-Ag mode. 

Figure 7.28 Development of the Raman spectrum of the CN-stretch vibration in the Ag(CN) complex after switching to a deposition potential of silver, 0.4 mol dm" KNOj, 0.028 mol dm KCN, 0.005 mol dm AgN03, A = 514.5 cm , 30 mW cm , and deposition on a Pt electrode. After switching to an anodic potential of dissolution, the Raman signal is observed (even increases) until the silver deposit has dissolved.

In the present project we have investigated whether surface enhanced resonance Raman spectroscopy (SERRS) could be used to study various types of DNA-chromophore interactions. In this technique, a silver colloid is added to the solution containing the molecule to be studied [34]. First, we had to test whether the complex, between dye and DNA, would remain unaltered upon adsorption to the silver colloid surface which is a necessary condition for a valid application of the method. A second system specific question concerns the useful information that can be extracted from frequency shifts and relative intensity alterations in the vibrational spectrum of the DNA-bound chromophore [35-37]. 

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