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Abstract
Chlorophyll special pairs in photosynthetic reaction centers function as both exciton acceptors and primary electron donors. Although the macrocyclic natural pigments contain Mg(II), the central metal in most synthetic analogs is Zn(II). Here we report that insertion of either Al(III) or Ga(III) into an imidazole-substituted corrole affords an exceptionally robust photoactive dimer. Notably, attractive electronic interactions between dimer subunits are relatively strong, as documented by signature changes in NMR and electronic absorption spectra, as well as by cyclic voltammetry, where two well-separated reversible redox couples were observed. EPR spectra of one-electron oxidized dimers closely mimic those of native special pairs, and strong through-space interactions between corrole subunits inferred from spectroscopic and electrochemical data are further supported by crystal structure analyses (3 Å interplanar distances, 5 Å lateral shifts, and 6 Å metal to metal distances).
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Affiliation(s)
- Vinay K Sharma
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technolog, Haifa 32000, Israel
| | - Atif Mahammed
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technolog, Haifa 32000, Israel
| | - Amir Mizrahi
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technolog, Haifa 32000, Israel.,Department of Chemistry, Nuclear Research Center Negev, Beer Sheva 9001, Israel
| | - Maryann Morales
- Beckman Institute, California Institute of Technology, Pasadena, California 91125, United States
| | - Natalia Fridman
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technolog, Haifa 32000, Israel
| | - Harry B Gray
- Beckman Institute, California Institute of Technology, Pasadena, California 91125, United States
| | - Zeev Gross
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technolog, Haifa 32000, Israel
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Cao X, Lin W, Yu Q. A Ratiometric Fluorescent Probe for Thiols Based on a Tetrakis(4-hydroxyphenyl)porphyrin–Coumarin Scaffold. J Org Chem 2011; 76:7423-30. [DOI: 10.1021/jo201199k] [Citation(s) in RCA: 108] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Xiaowei Cao
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, People's Republic of China
| | - Weiying Lin
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, People's Republic of China
| | - Quanxing Yu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, People's Republic of China
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Lee CH, Guo J, Chen LX, Mandal BK. Novel Zinc Phthalocyanine-Benzoquinone Rigid Dyad and Its Photoinduced Electron Transfer Properties. J Org Chem 2008; 73:8219-27. [DOI: 10.1021/jo801293s] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Chi-Hang Lee
- Department of Biological, Chemical and Physical Sciences, Illinois Institute of Technology, 3101 S. Dearborn St., Chicago, Illinois 60616, Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - Jiangchang Guo
- Department of Biological, Chemical and Physical Sciences, Illinois Institute of Technology, 3101 S. Dearborn St., Chicago, Illinois 60616, Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - Lin X. Chen
- Department of Biological, Chemical and Physical Sciences, Illinois Institute of Technology, 3101 S. Dearborn St., Chicago, Illinois 60616, Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - Braja. K. Mandal
- Department of Biological, Chemical and Physical Sciences, Illinois Institute of Technology, 3101 S. Dearborn St., Chicago, Illinois 60616, Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208
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Wiehe A, Senge MO, Schäfer A, Speck M, Tannert S, Kurreck H, Röder B. Electron donor–acceptor compounds: exploiting the triptycene geometry for the synthesis of porphyrin quinone diads, triads, and a tetrad. Tetrahedron 2001; 57:10089-110. [DOI: 10.1016/s0040-4020(01)01052-3] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Salikhov KM, Schlüpmann J, Plato M, Möbius K. Calculation of triplet-singlet transition efficiencies controlled by relative rotational diffusion of the two constituents of covalently linked radical pairs. Chem Phys 1997. [DOI: 10.1016/s0301-0104(96)00342-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Levanon H, Möbius K. Advanced EPR spectroscopy on electron transfer processes in photosynthesis and biomimetic model systems. Annu Rev Biophys Biomol Struct 1997; 26:495-540. [PMID: 9241428 DOI: 10.1146/annurev.biophys.26.1.495] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
This review focuses on the recent advances in EPR spectroscopy as they are applied both to photoinduced electron transfer in the photosynthetic apparatus and to biomimetic systems. The review deals with time-resolved direct-detection cw and pulsed EPR and ENDOR methods, both at conventional bands [X-(9.5 GHz), K-(24 GHz), and Q-(35 GHz)(] and at high frequency bands (W-band, 95 GHz, and even higher frequency bands). EPR studies on photosynthetic and model systems in their doublet, triplet and radical pair states are surveyed, including their static and dynamic properties. APplications of time-resolved EPR in studying photoinduced electron and energy transfer in isotropic and anisotropic environments, and the concepts of electron spin polarization and magnetic field effects in photochemical reactions are also reviewed.
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Affiliation(s)
- H Levanon
- Department of Physical Chemistry, Hebrew University of Jerusalem, Israel
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