Steady-state and time-resolved studies on the photophysical properties of fullerene-pyropheophorbide a complexes in polar and nonpolar solvents

被引：14
作者：
Ermilov, EA
Al-Omari, S
Helmreich, M
Jux, N
Hirsch, A
Röder, B
机构：
[1] Humboldt Univ, Inst Phys Photobiophys, D-12489 Berlin, Germany
[2] Univ Erlangen Nurnberg, Inst Organ Chem, D-91054 Erlangen, Germany
来源：
OPTICS COMMUNICATIONS | 2004年 / 234卷 / 1-6期
关键词：
pyropheophorbide a; fullerene C-60; photoinduced electron transfer; charge-separated state; singlet molecular oxygen;
D O I：
10.1016/j.optcom.2004.02.024
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A novel monofullerene-bis(pyropheophorbide a) dyad has been photophysically characterized by steady-state as well as time-resolved techniques. It was revealed that in this complex strong and fast quenching of the first excited singlet state of the pyropheophorbide a (pyroPheo) molecule occurs by efficient photoinduced electron transfer to the fullerene moiety in both polar (DMF) and nonpolar (toluene) solvents. In DMF the energy of the charge-separated state is 0.94 eV and it undergoes directly transition to the ground state resulting in a very low value of photosensitized singlet oxygen generation. In contrast to the situation in a polar solvent, in toluene the charge-separated state lies above the exited triplet state of pyroPheo as well as that Of C-60. It has been shown that in a nonpolar solvent a sufficient amount of singlet oxygen was generated by energy transfer from the excited triplet state of pyroPheo which has been populated via relaxation of the charge-separated state. (C) 2004 Elsevier B.V. All rights reserved.
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收藏
页码：245 / 252
页数：8
相关论文
共 38 条
[1]   PHOTOPHYSICAL PROPERTIES OF C60 [J].
ARBOGAST, JW ;
DARMANYAN, AP ;
FOOTE, CS ;
RUBIN, Y ;
DIEDERICH, FN ;
ALVAREZ, MM ;
ANZ, SJ ;
WHETTEN, RL .
JOURNAL OF PHYSICAL CHEMISTRY, 1991, 95 (01) :11-12
[2]   X-ray crystal structure of an anti-Buckminsterfullerene antibody Fab fragment:: Biomolecular recognition of C60 [J].
Braden, BC ;
Goldbaum, FA ;
Chen, BX ;
Kirschner, AN ;
Wilson, SR ;
Erlanger, BF .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2000, 97 (22) :12193-12197
[3]  
Camps X, 1999, CHEM-EUR J, V5, P2362, DOI 10.1002/(SICI)1521-3765(19990802)5:8<2362::AID-CHEM2362>3.0.CO
[4]  
2-5
[5]   Antigenicity of fullerenes: Antibodies specific for fullerenes and their characteristics [J].
Chen, BX ;
Wilson, SR ;
Das, M ;
Coughlin, DJ ;
Erlanger, BF .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1998, 95 (18) :10809-10813
[6]  
CHIBISOV AK, 1981, USP KHIM+, V50, P1169
[7]   Steady state and time resolved studies on photophysical properties of carbazole and 9-phenyl carbazole molecules and their quenching reactions with suitable electron accepters in the excited electronic states both at the ambient temperature and at 77 K [J].
De, AK ;
Ganguly, T .
JOURNAL OF LUMINESCENCE, 2001, 92 (04) :255-270
[8]   SPECTROELECTROCHEMICAL STUDY OF THE C60 AND C70 FULLERENES AND THEIR MONOANIONS, DIANIONS, TRIANIONS, AND TETRAANIONS [J].
DUBOIS, D ;
KADISH, KM ;
FLANAGAN, S ;
HAUFLER, RE ;
CHIBANTE, LPF ;
WILSON, LJ .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1991, 113 (11) :4364-4366
[9]  
Dzhagarov B. M., 1987, RUSS J PHYS CHEM, V61, P1281
[10]   PREPARATION OF POLYMERS WITH CONTROLLED MOLECULAR ARCHITECTURE - A NEW CONVERGENT APPROACH TO DENDRITIC MACROMOLECULES [J].
HAWKER, CJ ;
FRECHET, JMJ .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1990, 112 (21) :7638-7647
1234