title: Bambusuril as a One-Electron Donor for Photoinduced Electron Transfer to Methyl Viologen in Mixed Crystals.
abstract: Methyl viologen hexafluorophosphate (MV2+·2PF6-) and dodecamethylbambus[6]uril (BU6) form crystals in which the layers of viologen dications alternate with those of a 1:2 supramolecular complex of BU6 and PF6-. This arrangement allows for a one-electron reduction of MV2+ions upon UV irradiation to form MV+•radical cations within the crystal structure with half-lives of several hours in air. The mechanism of this photoinduced electron transfer in the solid state and the origin of the long-lived charge-separated state were studied by steady-state and transient spectroscopies, cyclic voltammetry, and electron paramagnetic resonance spectroscopy. Our experiments are supported by quantum-chemical calculations showing that BU6 acts as a reductant. In addition, analogous photochemical behavior is also demonstrated on other MV2+/BU6 crystals containing either BF4-or Br-counterions.
authors.affiliation: Department of Chemistry, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.|RECETOX, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.
authors.forename: Tomas
authors.initials: T
authors.lastname: Fiala
authors.affiliation: Department of Chemistry, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.|RECETOX, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.
authors.forename: Lucie
authors.initials: L
authors.lastname: Ludvíková
authors.affiliation: Department of Chemistry, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.|RECETOX, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.
authors.forename: Dominik
authors.initials: D
authors.lastname: Heger
authors.affiliation: Department of Chemistry, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.
authors.forename: Jan
authors.initials: J
authors.lastname: Švec
authors.affiliation: Department of Chemistry, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.|RECETOX, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.
authors.forename: Tomáš
authors.initials: T
authors.lastname: Slanina
authors.affiliation: Department of Chemistry, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.|RECETOX, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.
authors.forename: L'ubica
authors.initials: L
authors.lastname: Vetráková
authors.affiliation: Department of Chemistry, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.|CEITEC - Central European Institute of Technology and National Centre for Biomolecular Research, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.
authors.forename: Michal
authors.initials: M
authors.lastname: Babiak
authors.affiliation: Department of Chemistry, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.
authors.forename: Marek
authors.initials: M
authors.lastname: Nečas
authors.affiliation: RECETOX, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.|CEITEC - Central European Institute of Technology and National Centre for Biomolecular Research, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.
authors.forename: Petr
authors.initials: P
authors.lastname: Kulhánek
authors.affiliation: Department of Chemistry, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.|RECETOX, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.
authors.forename: Petr
authors.identifier: 0000-0001-6287-2742
authors.initials: P
authors.lastname: Klán
authors.affiliation: Department of Chemistry, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.|RECETOX, Faculty of Science, Masaryk University , Kamenice 5, 625 00 Brno, Czech Republic.
authors.forename: Vladimir
authors.identifier: 0000-0003-0090-5961
authors.initials: V
authors.lastname: Sindelar