Surface-enhanced Raman scattering of TSPP,Ag(II)TSPP,and Pb(II)TSPP adsorbed on AgI and AGCl colloids |
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| Institution: | 1. Department of Chemistry, Center of Nanotechnology and Tissue Engineering-Photobiology and Photomedicine Research Group, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo 14040-901, Brazil;2. Instituto Tecnológico de Aeronáutica, Departamento de Química, Comando-Geral de Tecnologia Aeroespacial, São José dos Campos, São Paulo 12228-900, Brazil;3. School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo 14040-901, Brazil;1. Synchrotron Radiation Research, Lund University,Box 118, Lund, 221 00, Sweden;2. Department of Chemistry and Chemical Engineering and Competence Centre for Catalysis, Chalmers University of Technology, Gothenburg, 412 96, Sweden |
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| Abstract: | Surface-enhanced Raman scattering (SERS) was measured for meso-tetrakis(4-sulfonatophenyl)porphine (TSPP) and its metal derivatives Ag(II)TSPP and Pb(II)TSPP adsorbed on AgI colloids, and for TSPP adsorbed on AgCl colloids. The experiments show that TSPP molecules adsorbed on AgI colloids undergo a silver incorporation, while TSPP adsorbed on AgCl colloids are converted into the porphyrin diacid H4TSPP2+ and the metalloporphyrin Ag(II)TSPP. The concentration dependences of SERS spectra for TSPP adsorbed on the two substrates are quite different. |
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