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Surface-Enhanced Raman Spectra of Metallotetraphenyl Porphyrin Adsorbed on AgI Colloids
Zhang Yinghui,Chen Dongming,He Tianjing,Wang Xiuyan,Liu Fanchen
Author NameAffiliationE-mail
Zhang Yinghui Department of Chemical Physics,The University of Science and Technology of China,Hefei 230026  
Chen Dongming Department of Chemical Physics,The University of Science and Technology of China,Hefei 230026 dmchen@ustc.edu.cn  
He Tianjing Department of Chemical Physics,The University of Science and Technology of China,Hefei 230026  
Wang Xiuyan Department of Chemical Physics,The University of Science and Technology of China,Hefei 230026  
Liu Fanchen Department of Chemical Physics,The University of Science and Technology of China,Hefei 230026  
Abstract:
Surface-enhanced Raman Spectra(SERS)of four metallotetraphenylporphyrins(MTPP,M=Ag,Mg,Cu,Pd)adsorbed on AgI colloid were studied using 632.8nm excitation.It was shown that MgTPP on AgI colloid undergoes a metal exchange reaction with the substrate to form AgTPP,evidenced by appearing characteristic Raman bands of AgTPP in the SERS of MgTPP.In contrary,metal exchange reaction was not observed for CuTPP and PdTPP molecules adsorbed on AgI colloids.In addition to the porphyrin-ring related bands,several monosubstituted benzene bands are also enhanced in the SERS spectra of MTPP.The SERS enhancement patterns of PdTPP and CuTPP in the region of 1400~1600cm-1 are very different from that of AgTPP,which can be attributed to the different stereochemistry of the adsorbents around Cm atoms.The present study demonstrates that semiconductors such as AgI can be suitable SERS substrates to study the structure and chemical reactions of adsorbed molecules.
Key words:  Surface-enhanced Raman,Metalloporphyrins,AgI
FundProject:国家自然科学基金资助项目(No.29873043)
碘化银胶体上四苯基卟啉金属配合物的表面增强拉曼光谱研究
章应辉,陈东明,何天敬,王秀燕,刘凡镇
摘要:
研究了四苯基卟啉金属配合物(MTPP,M=Ag,Mg,Cu,Pd)在AgI胶体上的表面增强拉曼光谱(SERS)。结果显示MgTPP与基底发生金属交换生成AgTPP,而在PdTPP和CuTPP上则未发现金属交换。除卟啉环的振动外,一些苯环振动带也被显著增强。在1400~1600cm-1范围,PdTPP和CuTPP的SERS与AgTPP有很大差别,可能反映了吸附分子在次甲基桥碳原子Cm附近立体构型的差异。
关键词:  表面增强拉曼  金属卟啉  AgI
DOI:10.1088/1674-0068/13/4/497-502
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