Self aggregation of cationic porphyrin in water.
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概要
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Self aggregation of 4,4′,4″,4'″-(21<I>H</I>,23<I>H</I>-porphine-5,10,15,20-tetrayl)tetrakis[1-methylpyridinium] cation (TMPyP<SUP>4+</SUP>) in water has been verified by means of fluorescence and <SUP>1</SUP>H NMR spectroscopy. The novel fluorescence behavior of TMPyP such as extraordinarily red-shifted Q(0-0) fluorescence band, blue shift of this band upon dilution, effects of added sodium chloride and sodium dodecyl sulfate micelles, and short fluorescence lifetime strongly suggests the formation of a stacking-type dimer of TMPyP<SUP>4+</SUP> at the TMPyP concentrations above 1×10<SUP>−6</SUP> mol dm<SUP>−3</SUP>. The <SUP>1</SUP>H NMR signal due to the porphyrin ring protons was observed as a broad singlet even though the concentration of TMPyP in D<SUB>2</SUB>O was 1×10<SUP>−5</SUP> mol dm<SUP>−3</SUP> while the signal in DMSO-<I>d</I><SUB>6</SUB> was a sharp singlet, suggesting the spontaneous association of TMPyP<SUP>4+</SUP> to form the face-to-face dimer having a considerably loose structure. The π–π interaction has been assumed to be enhanced upon photoexcitation.
- 公益社団法人 日本化学会の論文
著者
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Kano Koji
Department Of Molecular Science And Technology Doshisha University
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Nakajima Takeshi
Department of Chemistry Faculty of Science Tohoku University
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Takei Masao
Department of Applied Chemistry, Faculty of Engineering, Doshisha University
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Hashimoto Shizunobu
Department of Applied Chemistry, Faculty of Engineering, Doshisha University
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Hashimoto Shizunobu
Department of Applied Chemistry, Doshisha University
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