title: Improved Flavin-Based Catalytic Photooxidation of Alcohols through Intersystem Crossing Rate Enhancement.
abstract: The triplet excited-state formation efficiency in a flavin derivative was increased by the introduction of iodine into the molecular framework. The transient absorption measurements showed that the intersystem crossing rate was 1.1 × 10(10) s(-1), significantly faster than in the parent flavin compound. Furthermore, the photocatalytic efficiency of iodoflavin was evaluated using the oxidation of benzyl alcohol as a model reaction. The benzaldehyde product yields were higher when iodoflavin was used as a photocatalyst, showing that the increased triplet yield directly translates into improved photocatalysis. The iodoflavin catalyst also allowed the use of higher substrate concentrations (since the undesired electron transfer from singlet excited state was minimized), which is expected to improve the practical aspects of photocatalysis by flavins.
authors: Department of Chemistry, Center for Photochemical Sciences, Bowling Green State University , Bowling Green, Ohio 43403, United States.
authors: Kirill A
authors: KA
authors: Korvinson
authors: Department of Chemistry, Center for Photochemical Sciences, Bowling Green State University , Bowling Green, Ohio 43403, United States.
authors: George N
authors: GN
authors: Hargenrader
authors: Faculty of Chemistry, University of Belgrade , Studentski Trg 12-16, Belgrade 11000, Serbia.
authors: Jelena
authors: J
authors: Stevanovic
authors: Department of Chemistry, Center for Photochemical Sciences, Bowling Green State University , Bowling Green, Ohio 43403, United States.
authors: Yun
authors: Y
authors: Xie
authors: Department of Chemistry and Biochemistry, The Ohio State University , Columbus, Ohio 43210, United States.
authors: Jojo
authors: J
authors: Joseph
authors: Faculty of Chemistry, University of Belgrade , Studentski Trg 12-16, Belgrade 11000, Serbia.
authors: Veselin
authors: V
authors: Maslak
authors: Department of Chemistry and Biochemistry, The Ohio State University , Columbus, Ohio 43210, United States.
authors: Christopher M
authors: CM
authors: Hadad
authors: Department of Chemistry, Center for Photochemical Sciences, Bowling Green State University , Bowling Green, Ohio 43403, United States.
authors: Ksenija D
authors: KD
authors: Glusac
mesh_terms: D000438:Alcohols / Q000737:chemistry*; D001547:Benzaldehydes / Q000737:chemistry; D002384:Catalysis; D060326:Chemistry Techniques, Synthetic; D004579:Electron Transport; D005415:Flavins / Q000737:chemistry*; D010084:Oxidation-Reduction; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000438:Alcohols; D001547:Benzaldehydes; D005415:Flavins; C032175:benzaldehyde