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Photoinduced Triplet–Triplet Energy Transfer in a 2‐Ureido‐4(1 H )‐Pyrimidinone‐Bridged, Quadruply Hydrogen‐Bonded Ferrocene–Fullerene Assembly
Author(s) -
Feng Ke,
Yu MaoLin,
Wang SuMin,
Wang GeXia,
Tung ChenHo,
Wu LiZhu
Publication year - 2013
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201200818
Subject(s) - ferrocene , photoinduced electron transfer , chemistry , photochemistry , singlet state , fullerene , electron transfer , excited state , triplet state , reaction rate constant , spectroscopy , molecule , kinetics , organic chemistry , electrochemistry , atomic physics , physics , electrode , quantum mechanics
2‐Ureido‐4(1 H )‐pyrimidinone‐bridged ferrocene–fullerene assembly I is designed and synthesized for elaborating the photoinduced electron‐transfer processes in self‐complementary quadruply hydrogen‐bonded modules. Unexpectedly, steady‐state and time‐resolved spectroscopy reveal an inefficient electron‐transfer process from the ferrocene to the singlet or triplet excited state of the fullerene, although the electron‐transfer reactions are thermodynamically feasible. Instead, an effective intra‐assembly triplet–triplet energy‐transfer process is found to be operative in assembly I with a rate constant of 9.2×10 5 s −1 and an efficiency of 73 % in CH 2 Cl 2 at room temperature.