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Resonance Raman Study of Aggregated Meso-tetra(4-pyridinium) porphyrin Diacid
Zun-yun Li,Tong-tong Lu,Tian-jing He,Fan-chen Liu,Dong-ming Chen*
Author NameAffiliationE-mail
Zun-yun Li Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Tong-tong Lu Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Tian-jing He Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Fan-chen Liu Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Dong-ming Chen* Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China dmchen@ustc.edu.cn 
Abstract:
Resonance Raman spectra of aggregated meso-tetra(4-pyridinium)porphyrin diacid (H8TPyP6+)were studied with excitation near the exciton absorption bands of 470 nm.The UV-Vis absorption and resonance light scattering spectra of H8TPyP6+ monomers and aggregates were also measured. The observed Raman bands of monomeric and aggregated H8TPyP6+ were assigned on the basis of the observed deuteration shifts and by comparing with the Raman spectra of analogous porphyrin diacids. Aggregation causes moderate downshifts(2~6 cm-1) for high-frequency modes involving the in-plane CC/CN stretches of the porphyrin core and a dramatic upshift (12 cm-1) for the out-of-plane saddling mode of the porphyrin ring. The structural changes induced by aggregation and the possible hydrogen bonding interaction between the H8TPyP6+ molecules in the aggregate are discussed based on the spectral observations.
Key words:  Porphyrin diacid, Aggregate, Resonance Raman, Molecular vibration
FundProject:
Resonance Raman Study of Aggregated Meso-tetra(4-pyridinium) porphyrin Diacid
李遵云,卢同同,何天敬,刘凡镇,陈东明*
摘要:
研究了近激子吸收带激发下四-(4-吡啶基)卟啉二酸(H8TPyP6+)聚集体的共振拉曼光谱.测量了H8TPyP6+单体和聚集体的紫外可见吸收谱和共振光散射光谱.在氘代位移的基础上结合相关体系振动光谱研究,对测得的H8TPyP6+)单体和聚集体的拉曼谱带进行了指认.聚集体的形成导致H8TPyP6+的卟啉环CC/CN面内伸缩振动向低波数方向位移2~6 cm-1,而卟啉环鞍形面外振动带向高波数方向位移12cm-1.基于拉曼谱带的强度和频率变化分析了聚集引起的H8TPyP6+分子内结构变化和分子间氢键作用
关键词:  卟啉二酸,聚集体,共振拉曼,分子振动
DOI:10.1088/1674-0068/22/04/346-352
分类号: