C70vs. C60in zinc porphyrin–fullerene dyads: prolonged charge separation and ultrafast energy transfer from the second excited singlet state of porphyrin

2003 ◽  
Vol 2 (3) ◽  
pp. 251-258 ◽  
Author(s):  
Tero Kesti ◽  
Nikolai Tkachenko ◽  
Hiroko Yamada ◽  
Hiroshi Imahori ◽  
Shunichi Fukuzumi ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Charge Separation ◽  
Singlet State ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Zinc Porphyrin

Intramolecular sensitization within steroids: Excited-state interaction of C-17 α and β carbon–bromine bonds with a C-6 carbonyl group

2003 ◽  
Vol 81 (6) ◽  
pp. 660-668 ◽  
Author(s):  
Wen-Shan Li ◽  
Lokman Torun ◽  
Harry Morrison
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Carbonyl Group ◽  
Singlet State ◽  
State Interaction ◽  
Excited Singlet State ◽  
Excited Singlet

The synthesis, photochemistry, and photophysics of 17α-bromo-3α-(triphenylsilyloxy)-5α-androstan-6-one (1) and 17β-bromo-3β-(triphenylsilyloxy)-5α-androstan-6-one (2) have been studied in aqueous tetrahydrofuran. The 17α-bromo isomer gives evidence (reduced ϕf, τ1, and ϕisc for the ketone) for interaction between the ketone and C–Br moieties in the excited singlet state. Some photodehalogenation is also observed upon excitation of the ketone chromophore. This interaction seems to be absent or minimal for the 17β-bromo isomer.Key words: photodehalogenation, bromosteroid, ketosteroid, intramolecular singlet–singlet energy transfer (ISSET).

The Gold Porphyrin First Excited Singlet State¶

2002 ◽  
Vol 76 (1) ◽  
pp. 47 ◽  
Author(s):  
Joakim Andréasson ◽  
Gerdenis Kodis ◽  
Su Lin ◽  
Ana L. Moore ◽  
Thomas A. Moore ◽  
...  
Keyword(s):  
Singlet State ◽  
Excited Singlet State ◽  
Excited Singlet
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