title: A facile and high-yield formation of dipyrrin-boronic acid dyads and triads: a light-harvesting system in the visible region based on the efficient energy transfer.
abstract: Artificial light-harvesting systems, Ar,O-BODIPY dyads and triads conjugated with a light harvester, were synthesized in high yield by the reaction of an N2O2-type dipyrrin with boronic acids. Dyad 2 having a pyrene unit underwent quantitative Förster resonance energy transfer (FRET) from the antenna unit, pyrene, to the fluorophore unit, Ar,O-BODIPY. Triads 3·5 and 4·5 were quantitatively prepared by mixing pyridine-appended compounds 3 and 4 with saloph·Zn complex 5, respectively. Triad 4·5 underwent efficient FRET from the saloph·Zn complex unit to the fluorophore unit at the rate of 2.0 × 10(11) s(-1). Interestingly, the fluorescence quenching process in the excited state of the triad 3·5 took place following the energy transfer event. Thus, appropriate positioning of the energy donor and acceptor is necessary to construct a highly efficient FRET system.
authors.affiliation: Graduate School of Pure and Applied Sciences & Tsukuba Research Center for Interdisciplinary Materials Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan. nabesima@chem.tsukuba.ac.jp.
authors.forename: Masaki
authors.initials: M
authors.lastname: Yamamura
authors.forename: Shinya
authors.initials: S
authors.lastname: Yazaki
authors.forename: Motofumi
authors.initials: M
authors.lastname: Seki
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Matsui
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ikeda
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Nabeshima