title: A unidirectional energy transfer cascade process in a ruthenium junction self-assembled by alpha- and beta-cyclodextrins.
abstract: A Ru(II) complex, Ru(alpha2beta), with a trisbipyridyl core and two different receptor sites, alpha- and beta-cyclodextrins, acts as a junction to recognize photoactive guests based on anthracene, Anth, and Os(II), Os-ada, in aqueous solution. Upon light excitation of the self-assembled system Anth.Ru(alpha2beta).Os-ada, an energy cascade process takes place from the Anth guest to the Ru(alpha2beta) core, and subsequently, the energy is funneled to the Os-ada guest. The rates of the two photoinduced processes are determined by time-resolved emission and transient absorption spectroscopic techniques. The system introduces a directed self-assembly approach to unidirectional wires that can lead to nanosized arrays by judicious selection of the individual components.
authors.affiliation: School of Chemistry, University of Birmingham, Edgbaston, B15 2TT, UK.
authors.forename: Jonathan A
authors.initials: JA
authors.lastname: Faiz
authors.forename: René M
authors.initials: RM
authors.lastname: Williams
authors.forename: Maria José J Pereira
authors.initials: MJ
authors.lastname: Silva
authors.forename: Luisa
authors.initials: L
authors.lastname: De Cola
authors.forename: Zoe
authors.initials: Z
authors.lastname: Pikramenou
mesh_terms: D000218:Adamantane / Q000031:analogs & derivatives / Q000737:chemistry; D009942:Organometallic Compounds / Q000737:chemistry; D010777:Photochemistry; D011725:Pyridines / Q000737:chemistry; D012428:Ruthenium / Q000737:chemistry*; D013816:Thermodynamics; D047391:alpha-Cyclodextrins / Q000737:chemistry*; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D009942:Organometallic Compounds; D011725:Pyridines; D047391:alpha-Cyclodextrins; D047392:beta-Cyclodextrins; D012428:Ruthenium; C031215:betadex; D000218:Adamantane; C032613:alpha-cyclodextrin