Energy transfer followed by electron transfer in a supramolecular triad composed of boron dipyrrin, zinc porphyrin, and fullerene: a model for the photosynthetic antenna-reaction center complex
D'Souza, Francis Smith, Phillip M. Zandler, Melvin E. McCarty, Amy L. Itou, Mitsunari Araki, Yasuyaki Ito, Osamu
D'Souza, Francis
Smith, Phillip M.
Zandler, Melvin E.
McCarty, Amy L.
Itou, Mitsunari
Araki, Yasuyaki
Ito, Osamu
Citations
Altmetric:
Location
Time Period
Advisors
Original Date
Digitization Date
Issue Date
2004-06-30
Type
Article
Genre
Keywords
Research Support, Non-U.S. Gov't,Research Support, U.S. Gov't, Non-P.H.S.,Research Support, U.S. Gov't, P.H.S.
Subjects (LCSH)
Citation
Journal of the American Chemical Society. 2004 Jun 30; 126(25): 7898-907.
Abstract
The first example of a working model of the photosynthetic antenna-reaction center complex, constructed via self-assembled supramolecular methodology, is reported. For this, a supramolecular triad is assembled by axially coordinating imidazole-appended fulleropyrrolidine to the zinc center of a covalently linked zinc porphyrin-boron dipyrrin dyad. Selective excitation of the boron dipyrrin moiety in the boron dipyrrin-zinc porphyrin dyad resulted in efficient energy transfer (k(ENT)(singlet) = 9.2 x 10(9) s(-)(1); Phi(ENT)(singlet) = 0.83) creating singlet excited zinc porphyrin. Upon forming the supramolecular triad, the excited zinc porphyrin resulted in efficient electron transfer to the coordinated fullerenes, resulting in a charge-separated state (k(cs)(singlet) = 4.7 x 10(9) s(-)(1); Phi(CS)(singlet) = 0.9). The observed energy transfer followed by electron transfer in the present supramolecular triad mimics the events of natural photosynthesis. Here, the boron dipyrrin acts as antenna chlorophyll that absorbs light energy and transports spatially to the photosynthetic reaction center, while the electron transfer from the excited zinc porphyrin to fullerene mimics the primary events of the reaction center where conversion of the electronic excitation energy to chemical energy in the form of charge separation takes place. The important feature of the present model system is its relative "simplicity" because of the utilized supramolecular approach to mimic rather complex "combined antenna-reaction center" events of photosynthesis.
Table of Contents
Description
Click on the DOI link below to access the article (may not be free).
Publisher
American Chemical Society
Journal
Book Title
Series
Journal of the American Chemical Society
J. Am. Chem. Soc.
J. Am. Chem. Soc.
Digital Collection
Finding Aid URL
Use and Reproduction
Archival Collection
NLM
PubMed ID
DOI
ISSN
0002-7863