Raman and surface-enhanced Raman study of insecticide cyromazine

Surface-enhanced Raman scattering (SERS) spectroscopy is applied to the stu dy of the adsorption of the insecticide cyromazine on Ag colloid. The influ ence of pH and the aggregation inductors, sodium chloride, potassium nitrat e and sodium hydroxide on the adsorption mechanism was investigated. Two di fferent adsorption mechanisms are deduced depending on the experimental con ditions: via the N atom bounded to the cyclopropyl (cP) group or through an ionic pairing of protonated amino groups with the chloride adsorbed on the metal. An important contribution of the chemical mechanism was inferred wh en the interaction with the metal occurs through the N lone pair (C) 2001 E lsevier Science B.V. All rights reserved.