title: Photoinduced triplet-triplet energy transfer via the 2-ureido-4[1H]-pyrimidinone self-complementary quadruple hydrogen-bonded module.
abstract: Phosphorescence quenching and flash photolysis experiments demonstrate that photoinduced intra-assembly triplet-triplet energy transfer can take place via a 2-ureido-4[1H]-pyrimidinone-bridged benzophenone-naphthalene assembly I with a rate constant of 3.0 x 106 s-1 and an efficiency of 95% in CH2Cl2. This new finding suggests that with high binding strength and directionality, the 2-ureido-4[1H]-pyrimidinone hydrogen-bonded module may serve as a new model to illustrate the fundamental principles governing the triplet-triplet energy-transfer process through hydrogen bonds.
authors.affiliation: Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, Technical Institute of Physics and Chemistry and Graduate University, the Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Su-Min
authors.initials: SM
authors.lastname: Wang
authors.forename: Mao-Lin
authors.initials: ML
authors.lastname: Yu
authors.forename: Jie
authors.initials: J
authors.lastname: Ding
authors.forename: Chen-Ho
authors.initials: CH
authors.lastname: Tung
authors.forename: Li-Zhu
authors.initials: LZ
authors.lastname: Wu
mesh_terms: D000042:Absorption; D001577:Benzophenones / Q000737:chemistry; D004735:Energy Transfer; D006860:Hydrogen Bonding; D049449:Luminescence; D009682:Magnetic Resonance Spectroscopy; D009281:Naphthalenes / Q000737:chemistry; D010782:Photolysis; D011744:Pyrimidinones / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: C109276:2-ureido-4-pyrimidone; D001577:Benzophenones; D009281:Naphthalenes; D011744:Pyrimidinones; C031721:naphthalene; C047723:benzophenone