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Bednářová E, Beck LR, Rovis T, Goldschmid SL, Xie K, Tay NES, Ravetz BD, Li J, Joe CL. Tuning the Electrochemical and Photophysical Properties of Osmium-Based Photoredox Catalysts. Synlett 2022. [DOI: 10.1055/s-0041-1737792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
AbstractThe use of low-energy deep-red (DR) and near-infrared (NIR) light to excite chromophores enables catalysis to ensue across barriers such as materials and tissues. Herein, we report the detailed photophysical characterization of a library of OsII polypyridyl photosensitizers that absorb low-energy light. By tuning ligand scaffold and electron density, we access a range of synthetically useful excited state energies and redox potentials.1 Introduction1.1 Scope1.2 Measuring Ground-State Redox Potentials1.3 Measuring Photophysical Properties1.4 Synthesis of Osmium Complexes2 Properties of Osmium Complexes2.1 Redox Potentials of Os(L)2-Type Complexes2.2 Redox Potentials of Os(L)3-Type Complexes2.3 UV/Vis Absorption and Emission Spectroscopy3 Conclusions
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Affiliation(s)
| | | | | | | | | | | | | | - Jun Li
- Chemical Process Development, Bristol Myers Squibb
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2
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Buzzetti L, Crisenza GEM, Melchiorre P. Mechanistic Studies in Photocatalysis. Angew Chem Int Ed Engl 2019; 58:3730-3747. [DOI: 10.1002/anie.201809984] [Citation(s) in RCA: 357] [Impact Index Per Article: 71.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Indexed: 12/18/2022]
Affiliation(s)
- Luca Buzzetti
- ICIQ—Institute of Chemical Research of Catalonia the Barcelona Institute of Science and Technology Avenida Països Catalans 16 43007 Tarragona Spain
| | - Giacomo E. M. Crisenza
- ICIQ—Institute of Chemical Research of Catalonia the Barcelona Institute of Science and Technology Avenida Països Catalans 16 43007 Tarragona Spain
| | - Paolo Melchiorre
- ICIQ—Institute of Chemical Research of Catalonia the Barcelona Institute of Science and Technology Avenida Països Catalans 16 43007 Tarragona Spain
- ICREA—Catalan Institution for Research and Advanced Studies Passeig Lluís Companys 23 08010 Barcelona Spain
- IIT—Istituto Italiano di TecnologiaLaboratory of Asymmetric Catalysis and Photochemistry Via Morego 30 16163 Genoa Italy
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Buzzetti L, Crisenza GEM, Melchiorre P. Mechanistische Studien in der Photokatalyse. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201809984] [Citation(s) in RCA: 95] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Luca Buzzetti
- ICIQ—Institute of Chemical Research of Catalonia the Barcelona Institute of Science and Technology Avenida Països Catalans 16 43007 Tarragona Spanien
| | - Giacomo E. M. Crisenza
- ICIQ—Institute of Chemical Research of Catalonia the Barcelona Institute of Science and Technology Avenida Països Catalans 16 43007 Tarragona Spanien
| | - Paolo Melchiorre
- ICIQ—Institute of Chemical Research of Catalonia the Barcelona Institute of Science and Technology Avenida Països Catalans 16 43007 Tarragona Spanien
- ICREA—Catalan Institution for Research and Advanced Studies Passeig Lluís Companys 23 08010 Barcelona Spanien
- IIT—Istituto Italiano di TecnologiaLaboratory of Asymmetric Catalysis and Photochemistry Via Morego 30 16163 Genoa Italy
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Fukatsu A, Kondo M, Okamura M, Yoshida M, Masaoka S. Electrochemical response of metal complexes in homogeneous solution under photoirradiation. Sci Rep 2014; 4:5327. [PMID: 24937471 PMCID: PMC4060467 DOI: 10.1038/srep05327] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Accepted: 05/29/2014] [Indexed: 11/26/2022] Open
Abstract
The electrochemical detection of metal complexes in the photoexcited state is important for understanding photoinduced electron transfer (PET) processes, which play a central role in photo-energy conversion systems. In general, however, the redox potentials of excited states have been indirectly estimated by a combination of spectroscopic properties and ground-state redox potentials. To establish a simple method for directly determining the redox potentials of the photoexcited states of metal complexes, electrochemical measurements under several conditions were performed. The electrochemical response was largely influenced not only by the generation of photoexcited molecules but also by the convection induced by photoirradiation, even when the global temperature of the sample solution was unchanged. The suppression of these unfavourable electrochemical responses was successfully achieved by adopting well-established electrochemical techniques. Furthermore, as an initial demonstration, the photoexcited state of a Ru-based metal complex was directly detected, and its redox potential was determined using a thin layer electrochemical method.
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Affiliation(s)
- Arisa Fukatsu
- 1] Department of Life and Coordination-Complex Molecular Science, Institute for Molecular Science, 5-1, Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan [2] The Graduate University for Advanced Studies [SOKENDAI], Shonan Village, Hayama, Kanagawa 240-0193 Japan
| | - Mio Kondo
- 1] Department of Life and Coordination-Complex Molecular Science, Institute for Molecular Science, 5-1, Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan [2] The Graduate University for Advanced Studies [SOKENDAI], Shonan Village, Hayama, Kanagawa 240-0193 Japan [3] Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, 38, Nishigo-naka, Myodaiji, Okazaki, Aichi 444-8585 Japan [4] ACT-C, Japan Science and Technology Agency (JST), 4-1-8, Honcho, Kawaguchi, Saitama 332-0012 Japan
| | - Masaya Okamura
- 1] Department of Life and Coordination-Complex Molecular Science, Institute for Molecular Science, 5-1, Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan [2] The Graduate University for Advanced Studies [SOKENDAI], Shonan Village, Hayama, Kanagawa 240-0193 Japan
| | - Masaki Yoshida
- Department of Life and Coordination-Complex Molecular Science, Institute for Molecular Science, 5-1, Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan
| | - Shigeyuki Masaoka
- 1] Department of Life and Coordination-Complex Molecular Science, Institute for Molecular Science, 5-1, Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan [2] The Graduate University for Advanced Studies [SOKENDAI], Shonan Village, Hayama, Kanagawa 240-0193 Japan [3] Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, 38, Nishigo-naka, Myodaiji, Okazaki, Aichi 444-8585 Japan
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Li G, Magana D, Dyer RB. Photoinduced electron transfer in folic acid investigated by ultrafast infrared spectroscopy. J Phys Chem B 2012; 116:3467-75. [PMID: 22364409 PMCID: PMC3311227 DOI: 10.1021/jp300392a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Conformational control of excited-state intramolecular electron transfer (ET) in folic acid (FA) has been investigated using femtosecond time-resolved infrared (TRIR) spectroscopy. Ultrafast excited-state ET between the pterin and the 4-aminobenzoyl subunits of FA is observed for the anionic form (at pH 10.0). An ET lifetime of 2.5 ps is estimated from Marcus theory for FA in the "U" conformation, in close agreement with the observed lifetime of 2.0 ps. Return to the ground state through the reverse ET reaction happens almost as rapidly, within 5 ps, resulting in rapid quenching of the singlet excited state. In mixed water:dimethyl sulfoxide solvent, ET becomes more unfavorable as FA adopts a more open conformation, thereby increasing the effective donor-acceptor distance and reducing the coupling energy. In contrast, no ET is observed for the cationic form of FA at low pH (6.0). In this case, the initial singlet excited state is localized on the pterin moiety of FA, and the excited-state charge distribution evolves with time. The charge redistribution in the pterin that occurs with intersystem crossing to the triplet state is characterized by changes in the transient IR spectrum. The excited-state lifetime is much longer in the absence of an ET quenching pathway. These results provide new insight into the mechanism of photodegradation and toxicity of FA. Ultrafast intramolecular ET in closed conformations of FA rapidly quenches the excited state and prevents efficient triplet state formation. Thus, conformations of FA that allow ultrafast intra-ET and rapid quenching of the singlet excited state play a key role in inhibiting pathological pathways following photoexcitation of FA.
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Affiliation(s)
- Guifeng Li
- Department of Chemistry, Emory University, Atlanta, Georgia, 30322, United States
| | - Donny Magana
- Department of Chemistry, Emory University, Atlanta, Georgia, 30322, United States
| | - R. Brian Dyer
- Department of Chemistry, Emory University, Atlanta, Georgia, 30322, United States
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Zhang RY, Qin Y, Lv XQ, Wang P, Xu TY, Zhang L, Miao CY. A fluorometric assay for high-throughput screening targeting nicotinamide phosphoribosyltransferase. Anal Biochem 2011; 412:18-25. [PMID: 21211508 DOI: 10.1016/j.ab.2010.12.035] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2010] [Revised: 12/25/2010] [Accepted: 12/28/2010] [Indexed: 11/24/2022]
Abstract
Nicotinamide adenine dinucleotide (NAD) plays a crucial role in many cellular processes. As the rate-limiting enzyme of the predominant NAD biosynthesis pathway in mammals, nicotinamide phosphoribosyltransferase (Nampt) regulates the cellular NAD level. Tumor cells are more sensitive to the NAD levels, making them more susceptible to Nampt inhibition than their nontumorigenic counterparts. Experimental evidence has indicated that Nampt might have proangiogenic activity and supports the growth of some tumors, so Nampt inhibitors may be promising as antitumor agents. However, only four Nampt inhibitors have been reported, and no high-throughput screening (HTS) strategy for Nampt has been proposed to date, largely limiting the drug discovery targeting Nampt. Therefore, the development of a robust HTS strategy for Nampt is both imperative and significant. Here we developed a fluorometric method for a Nampt activity assay by measuring the fluorescence of nicotinamide mononucleotide (NMN) derivative resulting from the enzymatic product NMN through simple chemical reactions. Then we set up an HTS system after thorough optimizations of this method and validated that it is feasible and effective through a pilot screening on a small library. This HTS system should expedite the discovery of Nampt inhibitors as antitumor drug candidates.
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Affiliation(s)
- Ruo-Yu Zhang
- Department of Pharmacology, Second Military Medical University, Shanghai 200433, China
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Castaldelli E, Triboni ER, Demets GJF. Self-assembled naphthalenediimide derivative films for light-assisted electrochemical reduction of oxygen. Chem Commun (Camb) 2011; 47:5581-3. [DOI: 10.1039/c1cc10139k] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Electrochemically self-assembled N,N′-(ethyl-N″,N″,N″-dimethyloctadecane ammonium)-1,4,5,8-naphthalene diimide bromide films produce photocurrent with oxygen in water.
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Affiliation(s)
- Evandro Castaldelli
- Departamento de Química
- Faculdade de Filosofia Ciências e Letras de Ribeirão Preto
- Universidade de São Paulo
- Ribeirão Preto
- Brazil
| | | | - Grégoire Jean-François Demets
- Departamento de Química
- Faculdade de Filosofia Ciências e Letras de Ribeirão Preto
- Universidade de São Paulo
- Ribeirão Preto
- Brazil
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Siegers C, Würfel U, Zistler M, Gores H, Hohl-Ebinger J, Hinsch A, Haag R. Overcoming Kinetic Limitations of Electron Injection in the Dye Solar Cell via Coadsorption and FRET. Chemphyschem 2008; 9:793-8. [DOI: 10.1002/cphc.200700864] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Putt KS, Hergenrother PJ. An enzymatic assay for poly(ADP-ribose) polymerase-1 (PARP-1) via the chemical quantitation of NAD(+): application to the high-throughput screening of small molecules as potential inhibitors. Anal Biochem 2004; 326:78-86. [PMID: 14769338 DOI: 10.1016/j.ab.2003.11.015] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2003] [Indexed: 11/20/2022]
Abstract
The enzyme poly(adenosine 5'-diphosphate (ADP)-ribose) polymerase (PARP-1) catalyzes the formation of (ADP)-ribose polymers on a variety of protein acceptors in a NAD+ -dependent manner. While PARP-1 is activated by DNA damage and plays a critical role in cellular survival mechanisms, its overactivation leads to a depletion of NAD+/ATP energy stores and ultimately to necrotic cell death. Due to this dual role of PARP in the cell, small-molecule inhibitors of the PARP family of enzymes have been widely investigated for use as potentiators of anticancer therapies and as inhibitors of neurodegeneration and ischemic injuries. Unfortunately, standard assays for PARP inhibition are not optimal for the high-throughput screening of compound collections or combinatorial libraries. Described herein is a highly sensitive, inexpensive, and operationally simple assay for the rapid assessment of PARP activity that relies on the conversion of NAD+ into a highly fluorescent compound. We demonstrate that this assay can readily detect PARP inhibitors in a high-throughput screen using 384-well plates. In addition, the assay can be used to determine IC50 values for PARP inhibitors that have a range of inhibitory properties. As existing PARP assays utilize specialized reagents such as radiolabeled/biotinylated NAD+ or antibodies to poly(ADP-ribose), the chemical quantitation method described herein offers a highly sensitive and convenient alternative for rapidly screening compound collections for PARP inhibition.
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Affiliation(s)
- Karson S Putt
- Department of Biochemistry, University of Illinois, Urbana, IL 61801, USA
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