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Surface - Enhanced Raman Spectra of H2 TPP and its Ag-, Mg-Chelates (AgTPP, MgTPP) on AgBr Colloid
Zhang Yinghui,Chen Dongming,He Tianjing,Zhang Xiaojing,,Liu Fanchen
Author NameAffiliation
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 
He Tianjing Department of Chemical Physics, The University of Science and Technology of China, Hefei 230026 
Zhang Xiaojing, 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 free(base tetraphenylporphyrin (H2TPP) and its Ag(, Mg(chelates (AgTPP and MgTPP) adsorbed on AgBr colloid were studied by 632.8 and 488.0nm excitation. The SERS results show that the adsorbed MgTPP (or H2TPP) molecules undergo silver(exchange (or silver(incorporation) reaction to form AgTPP. The chavge transfer mechanism is believed to be the major origin of Raman enhancement for both 632.8 and 488.0nm excitation lines. For 488.0nm excitation, additional mechanism of electronic pre(resonance effect also contributes to the Raman enhancement, resulting in a slightly different SERS spectra compared with 632.8nm excitation.
Key words:  Surface(enhanced Raman spectra, Tetraphenylporphyrin, Charge transfer
FundProject:国家自然科学基金资助课题(29873043)和高等学校博士学科点专项科研基金资助课题.
四苯基卟啉及其金属配合物在溴化银胶体上的表面增强喇曼光谱研究
章应辉,陈东明,何天敬,张孝静,刘凡镇
摘要:
研究了四苯基卟啉(H2TPP)及其金属配合物(AgTPP和MgTPP)在AgBr胶体上的表面增强喇曼光谱(SERS).SERS光谱表明,吸附在AgBr胶体粒子表面的MgTPP和H2TPP分子分别发生银离子交换和银配位反应生成AgTPP,这种表面反应可能与激光照射有关.AgTPP分子在胶体粒子表面的吸附导致卟啉大环的非平面化,使vs振动(M-N键伸缩振动)向高波数方向移动近10cm-1.632.8nm激发下的表面喇曼谱以化学增强为主,而488.0nm激发下表面喇曼谱除化学增强效应外,还存在共振增强效应.
关键词:  表面增强喇曼光谱  四苯基卟啉  电荷转移
DOI:10.1088/1674-0068/14/3/315-322
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