TY - JOUR
T1 - Photoinduced electron-transfer reactions and magnetic field effects on the decay rates of a photogenerated biradical from zinc porphyrin-viologen linked compounds in an ionic liquid
AU - Tahara, Hironobu
AU - Yonemura, Hiroaki
AU - Harada, Satoko
AU - Nakashima, Akio
AU - Yamada, Sunao
N1 - Funding Information:
The authors are grateful to Mr. H. Horiuchi for the preparation of quartz cells for fluorescence and transient absorption spectral experiments. The authors also thank The Center of Advanced Instrumental Analysis, Kyushu University, for 1 H NMR measurements and elemental analysis. The present study was financially supported by the Mazda Foundation and by a Grant-in-Aid for Scientific Research C (No. 21550135), Nanotechnology Network Project (Kyushu Area Nanotechnology Network), and the Global COE Program ‘Science for Future Molecular Systems’ from MEXT of Japan.
PY - 2012/2/6
Y1 - 2012/2/6
N2 - Fluorescence and transient absorption spectra of zinc-porphyrin (ZnP)-viologen linked compounds with various methylene groups indicate that intramolecular electron-transfer from the singlet or triplet excited state of ZnP to viologen occurred and a biradical was generated in the ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate) at various temperatures (283-343 K). The decay rate constants of the biradical decreased in 0-0.2∼0.5 T and became constant in 0.2∼0.5-1 T. Unique effects of temperature and methylene chain length on electron-transfer and magnetic field effects were observed and are probably due to the properties of the ionic liquid as compared with benzonitrile.
AB - Fluorescence and transient absorption spectra of zinc-porphyrin (ZnP)-viologen linked compounds with various methylene groups indicate that intramolecular electron-transfer from the singlet or triplet excited state of ZnP to viologen occurred and a biradical was generated in the ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate) at various temperatures (283-343 K). The decay rate constants of the biradical decreased in 0-0.2∼0.5 T and became constant in 0.2∼0.5-1 T. Unique effects of temperature and methylene chain length on electron-transfer and magnetic field effects were observed and are probably due to the properties of the ionic liquid as compared with benzonitrile.
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U2 - 10.1016/j.cplett.2011.12.037
DO - 10.1016/j.cplett.2011.12.037
M3 - Article
AN - SCOPUS:84856103579
VL - 524
SP - 42
EP - 48
JO - Chemical Physics Letters
JF - Chemical Physics Letters
SN - 0009-2614
ER -