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• W2068167130 abstract "A new type of viologen-linked or -bridged N-alkylporphyrin and metalloporphyrin diads was synthesized and characterized by 1H 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+, Mg2+, Al3+, and Si4+ 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." @default.
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• W2068167130 date "1999-03-26" @default.
• W2068167130 modified "2023-10-17" @default.
• W2068167130 title "Photophysical and Photochemical Properties of Viologen-Linked <i>N</i>-Alkylporphyrin Diads and Their Metal Complexes" @default.
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• W2068167130 doi "https://doi.org/10.1021/jp984221r" @default.
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