title: Efficient light-harvesting antenna with a multi-porphyrin cascade.
abstract: A light-harvesting antenna 1 comprising three varieties of porphyrins, each having a different number of ethynyl groups at its meso positions, was designed and synthesized. Antenna 1 exhibits intense absorption throughout the visible region up to 700 nm. Steady-state and time-resolved fluorescence studies showed that singlet-excited-state energy transfer occurs from the peripheral porphyrins to the central porphyrin with >90% efficiency and rate constants on the order of 10(10) s(-1).
authors.affiliation: Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan.
authors.forename: Atsuhiro
authors.initials: A
authors.lastname: Uetomo
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Kozaki
authors.forename: Shuichi
authors.initials: S
authors.lastname: Suzuki
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Yamanaka
authors.forename: Osamu
authors.initials: O
authors.lastname: Ito
authors.forename: Keiji
authors.initials: K
authors.lastname: Okada