Surface-enhanced resonance Raman spectroscopy of 2-pyridylhydrazone and 1,10-phenanthroline chelate complexes with metal ions on colloidal silver

Surface-enhanced resonance Raman spectra (SERRS) of the complexes PAPH-Co(II), PAPH-Ni(II), PAPH-Fe(II), and PHEN-Fe(II) (PAPH = 2-pyridine carboxyaldehyde 2-pyridylhydrazone and PHEN = 1,10-phenanthroline) adsorbed on silver colloid have been studied. Differences among SERS spectra of ligands and SERRS spectra of complexes have been investigated. Ultra-sensitive methods for metal determination with limits of detection at the ng ml−1 level are presented.