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Seetharaman S, Dukh M, Tabaczynski WA, Ou Z, Karr PA, Kadish KM, Pandey RK, D'Souza F. Meso-Biphenyl-Linked, Near- and Far-Infrared Emitting, Chlorin and Bacteriochlorin Dimers: Synthesis, Excitation Transfer, and Singlet Oxygen Production. Chempluschem 2021; 86:674-680. [PMID: 33881234 DOI: 10.1002/cplu.202100120] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 03/30/2021] [Indexed: 12/18/2022]
Abstract
A series of meso-biphenyl linked chlorin and bacteriochlorin dimers, derived from naturally occurring chlorophyll (Chl-a) and bacteriochlorophyll (BChl-a) were synthesized in 32 % to 44 % yields and characterized, as photosynthetic antenna mimics, and a new class of singlet oxygen producing agents. The dimers are characterized by absorption, fluorescence, electrochemical, spectroelectrochemical and computational methods to evaluate their physico-chemical properties, and to identify ground and excited state interactions. Evidence of excited energy exchange among the chromophores in the dimer is derived from femtosecond transient absorption spectral studies. Rate constants for excitation hopping were in the order of 1011 s-1 , indicating occurrence of efficient processes. Nanosecond transient absorption studies confirmed relaxation of the singlet excited chlorin and bacteriochlorin dimers to their corresponding triplet states (3 Chl* and 3 Bchl*). As predicted by the established energy level diagrams, both 3 Chl* and 3 Bchl* are shown to be capable of producing singlet oxygen with appreciable quantum yields (ϕSO ∼0.3).
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Affiliation(s)
- Sairaman Seetharaman
- Department of Chemistry, University of North Texas, 1155 Union Circle, #305070, Denton, TX 76203-5017, USA
| | - Mykhaylo Dukh
- PDT Center, Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Walter A Tabaczynski
- PDT Center, Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Zhongping Ou
- Department of Chemistry, University of Houston, Houston, TX 77204, USA
| | - Paul A Karr
- Department of Physical Sciences and Mathematics, Wayne State College, 1111 Main Street, Wayne, Nebraska, 68787, USA
| | - Karl M Kadish
- Department of Chemistry, University of Houston, Houston, TX 77204, USA
| | - Ravindra K Pandey
- PDT Center, Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Francis D'Souza
- Department of Chemistry, University of North Texas, 1155 Union Circle, #305070, Denton, TX 76203-5017, USA
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Synthesis of Fluorinated Chlorophylls‐
a
and Their Bio/Physico‐Chemical Properties. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000887] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Clark NF, Taylor-Robinson AW. COVID-19 Therapy: Could a Chlorophyll Derivative Promote Cellular Accumulation of Zn 2+ Ions to Inhibit SARS-CoV-2 RNA Synthesis? FRONTIERS IN PLANT SCIENCE 2020; 11:1270. [PMID: 32922431 PMCID: PMC7457044 DOI: 10.3389/fpls.2020.01270] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 08/04/2020] [Indexed: 06/11/2023]
Affiliation(s)
- Nicole F. Clark
- Institute for Applied Ecology, University of Canberra, Bruce, ACT, Australia
| | - Andrew W. Taylor-Robinson
- Infectious Diseases Research Group, School of Health, Medical & Applied Sciences, Central Queensland University, Brisbane, QLD, Australia
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Covalent heterodyads of synthetic chlorophyll derivatives linked with linear rigid substituents at the 20-positions constructing photoexcited energy transfer systems. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131130] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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