Control of dihedral angle of meso-meso linked diporphyrins by introducing dioxymethylene straps of various length.
Meso-meso linked strapped diporphyrins S(n)(n = 10, 8, 6, 4, 3, 2, and 1) were synthesized by intramolecular Ag(I)-promoted coupling of dioxymethylene-bridged diporphyrins B(n). With decrease of strap length, the absorption and fluorescence spectra and the one-electron oxidation potentials of S(n) changed in a systematic manner, suggesting a progressive increase in electronic communication of two porphyrins.
Yoshida
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Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
Osuka
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A