Abstract
The SERS spectra of copper (II) complex of meso-tetris (4-N-cyano methyl pyridyl) porphyrin (Cu11NACN) and the complexes with the calf thymus double-stranded and denatured DNA on silver sols obtained by reducing AgNO3 with citrate and the effect of pH and the concentration of Cu11NACN have been investigated. It was pointed out that, pH=5∼6, the concentration of Cu11NACN ca 1 × 10−5 mol/L are better for SERS. Cu11NACN acts on Ag sols through the pyridyl N and the porphyrin core together, and is absorbed on Ag sols in the slope-on form which is not influenced by adding the double stranded and the denatured DNA. In the system of Ag sols, Cu11NACN acts on the double stranded DNA at phosphate by electrostatic force, but maybe part-intercalates the single stranded of the denatured DNA accompanied with the electrostatic force similar to the double stranded DNA.
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