“…5,10,15, tpp), 1,3-dibromopropane, 1,6-dibromohexane, 1-iodopropane, nitromethane, 4,4′-bipyridine, and 3,4-dihydro-2H-pyrido[1,2-a]-pyrimidin-2-one were purchased from Tokyo Kasei Kogyo Co., Ltd. and were used without further purification. Silver hexafluorophosphate was purchased from Aldrich Chemical Co., Inc. Tetrahydrofuran (THF), N,N-dimethylformamide (DMF), methanol (MeOH), acetonitrile (MeCN), and propylene glycol used were of Spectrosol (Dojindo Laboratory) for syntheses and spectroscopic measurements and were of Luminasol (Dojindo Laboratory) for luminescence and kinetic measurements.…”
Section: Methodsmentioning
confidence: 99%
“…In this work, we report the photophysical and photochemical properties of such models of electron donor and acceptor systems. The preliminary communications have been reported elsewhere. , 1 2 …”
Section: Introductionmentioning
confidence: 96%
“…The preliminary communications have been reported elsewhere. 14,15 Results and Discussion Absorption Spectral Properties. Absorption spectra of viologen-linked diads and their metal complexes in MeCN are shown in Figures S1 and S2, and their numerical data are shown in Tables S1 and S2.…”
A new type of viologen-linked or -bridged N-alkylporphyrin and metalloporphyrin diads was synthesized and characterized by 1 H NMR spectroscopy. Although the viologen moiety of free base diads linked with a methylene chain is flexible in solution, the insertion of metal ions results in the extended conformation, where the viologen moiety is located nearly perpendicular to the N-alkylporphyrin plane. The diad, having two porphyrin units bridged by a viologen moiety, is more rigid in conformation than the diad containing one porphyrin unit. The fluorescence quantum yields in the viologen-linked and -bridged N-alkylporphyrins become larger by insertion of H + , Mg 2+ , Al 3+ , and Si 4+ into the N-alkylporphyrins. This may arise because the extended and orthogonal conformer due to the electrostatic repulsion between the viologen and the central metal ion decelerates the ET quenching of N-alkylporphyrin by the bound viologen unit.
“…5,10,15, tpp), 1,3-dibromopropane, 1,6-dibromohexane, 1-iodopropane, nitromethane, 4,4′-bipyridine, and 3,4-dihydro-2H-pyrido[1,2-a]-pyrimidin-2-one were purchased from Tokyo Kasei Kogyo Co., Ltd. and were used without further purification. Silver hexafluorophosphate was purchased from Aldrich Chemical Co., Inc. Tetrahydrofuran (THF), N,N-dimethylformamide (DMF), methanol (MeOH), acetonitrile (MeCN), and propylene glycol used were of Spectrosol (Dojindo Laboratory) for syntheses and spectroscopic measurements and were of Luminasol (Dojindo Laboratory) for luminescence and kinetic measurements.…”
Section: Methodsmentioning
confidence: 99%
“…In this work, we report the photophysical and photochemical properties of such models of electron donor and acceptor systems. The preliminary communications have been reported elsewhere. , 1 2 …”
Section: Introductionmentioning
confidence: 96%
“…The preliminary communications have been reported elsewhere. 14,15 Results and Discussion Absorption Spectral Properties. Absorption spectra of viologen-linked diads and their metal complexes in MeCN are shown in Figures S1 and S2, and their numerical data are shown in Tables S1 and S2.…”
A new type of viologen-linked or -bridged N-alkylporphyrin and metalloporphyrin diads was synthesized and characterized by 1 H NMR spectroscopy. Although the viologen moiety of free base diads linked with a methylene chain is flexible in solution, the insertion of metal ions results in the extended conformation, where the viologen moiety is located nearly perpendicular to the N-alkylporphyrin plane. The diad, having two porphyrin units bridged by a viologen moiety, is more rigid in conformation than the diad containing one porphyrin unit. The fluorescence quantum yields in the viologen-linked and -bridged N-alkylporphyrins become larger by insertion of H + , Mg 2+ , Al 3+ , and Si 4+ into the N-alkylporphyrins. This may arise because the extended and orthogonal conformer due to the electrostatic repulsion between the viologen and the central metal ion decelerates the ET quenching of N-alkylporphyrin by the bound viologen unit.
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