Electron-transfer reactions of the 2-nitrothiophen triplet state studied by laser flash photolysis

1982 ◽  
Vol 78 (2) ◽  
pp. 533 ◽  
Author(s):  
Luis J. A. Martins
Keyword(s):  
Electron Transfer ◽  
Triplet State ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Transfer Reactions ◽  
Electron Transfer Reactions

Photoexcitation and Electron Transfer Reactions of Zinc Lipidporphyrins in DMSO

1999 ◽  
Vol 03 (01) ◽  
pp. 53-59 ◽  
Author(s):  
TAKERU OHGUSHI ◽  
ZI-CHEN LI ◽  
FU-MIAN LI ◽  
TERUYUKI KOMATSU ◽  
SHINJI TAKEOKA ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Steric Effect ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Transfer Reactions ◽  
Quantum Yields ◽  
Electron Transfer Reactions ◽  
Fluorescence Quantum Yields ◽  
Photochemical Properties

The photophysical and photochemical properties of 5,10,15,20-tetrakis{α,α,α,α-o-[2′,2′-dimethyl-20′-((2″-(trimethylammonio)ethyl)phosphonatoxy)alkanamido]phenyl}porphinatozinc(II) (zinc lipidporphyrins, ZnLPs ( C 10, C 18)) have been studied in homogeneous DMSO solution and compared with those of 5,10,15,20-tetrakis{α,α,α,α-o-pivalamidophenyl}porphinatozinc(II) ( ZnTpivPP ) and tetrakis-phenylporphinatozinc(II) ( ZnTPP ). The fluorescence quantum yields of the ZnLPs were lower than that of ZnTPP , but their fluorescence lifetimes were relatively long. The electron transfer reactions from the photoexcited states of these Zn porphyrin complexes to several quinone derivatives were evaluated by fluorescence spectroscopy and laser flash photolysis. The efficiences of oxidative quenching of the excited porphyrins via a dynamic process were significantly decreased by the presence of the bulky substituents on one side of the porphyrin macrocycle. This steric effect of the porphyrin side-chains was quantitatively examined by the Marcus classical treatment.

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