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Sheth S, Gotico P, Herrero C, Quaranta A, Aukauloo A, Leibl W. Proton Domino Reactions at an Imidazole Relay Control the Oxidation of a Tyr Z-His 190 Artificial Mimic of Photosystem II. Chemistry 2024:e202400862. [PMID: 38676548 DOI: 10.1002/chem.202400862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 04/10/2024] [Accepted: 04/24/2024] [Indexed: 04/29/2024]
Abstract
A close mimic of P680 and the TyrosineZ-Histidine190 pair in photosystem II (PS II) has been synthesized using a ruthenium chromophore and imidazole-phenol ligands. The intramolecular oxidation of the ligands by the photoproduced Ru(III) species is characterized by a small driving force, very similar to PS II where the complexity of kinetics was attributed to the reversibility of electron transfer steps. Laser flash photolysis revealed biphasic kinetics for ligand oxidation. The fast phase (τ<50 ns) corresponds to partial oxidation of the imidazole-phenol ligand, proton transfer within the hydrogen bond, and formation of a neutral phenoxyl radical. The slow phase (5-9 μs) corresponds to full oxidation of the ligand which is kinetically controlled by deprotonation of the distant 1-nitrogen of the imidazolium. These results show that imidazole with its two protonatable sites plays a special role as a proton relay in a 'proton domino' reaction.
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Affiliation(s)
- Sujitraj Sheth
- CEA, CNRS, Institut de Biologie Intégrative de la Cellule (I2BC), Université Paris Saclay, 91198, Gif-sur-Yvette, France
- Current affiliation , National Key Laboratory of Green Pesticide, Guizhou University, Guiyang, 550025, Guizhou, China
| | - Philipp Gotico
- CEA, CNRS, Institut de Biologie Intégrative de la Cellule (I2BC), Université Paris Saclay, 91198, Gif-sur-Yvette, France
| | - Christian Herrero
- CNRS, Institut de Chimie Moléculaire et Des Matériaux d'Orsay (ICMMO), Université Paris Saclay, 91405, Orsay, France
| | - Annamaria Quaranta
- CEA, CNRS, Institut de Biologie Intégrative de la Cellule (I2BC), Université Paris Saclay, 91198, Gif-sur-Yvette, France
| | - Ally Aukauloo
- CEA, CNRS, Institut de Biologie Intégrative de la Cellule (I2BC), Université Paris Saclay, 91198, Gif-sur-Yvette, France
- CNRS, Institut de Chimie Moléculaire et Des Matériaux d'Orsay (ICMMO), Université Paris Saclay, 91405, Orsay, France
| | - Winfried Leibl
- CEA, CNRS, Institut de Biologie Intégrative de la Cellule (I2BC), Université Paris Saclay, 91198, Gif-sur-Yvette, France
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2
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Kessinger MC, Xu J, Cui K, Loague Q, Soudackov AV, Hammes-Schiffer S, Meyer GJ. Direct Evidence for a Sequential Electron Transfer-Proton Transfer Mechanism in the PCET Reduction of a Metal Hydroxide Catalyst. J Am Chem Soc 2024; 146:1742-1747. [PMID: 38193695 DOI: 10.1021/jacs.3c10742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
The proton-coupled electron transfer (PCET) mechanism for the reaction Mox-OH + e- + H+ → Mred-OH2 was determined through the kinetic resolution of the independent electron transfer (ET) and proton transfer (PT) steps. The reaction of interest was triggered by visible light excitation of [RuII(tpy)(bpy')H2O]2+, RuII-OH2, where tpy is 2,2':6',2″-terpyridine and bpy' is 4,4'-diaminopropylsilatrane-2,2'-bipyridine, anchored to In2O3:Sn (ITO) thin films in aqueous solutions. Interfacial kinetics for the PCET reduction reaction were quantified by nanosecond transient absorption spectroscopy as a function of solution pH and applied potential. Data acquired at pH = 5-10 revealed a stepwise electron transfer-proton transfer (ET-PT) mechanism, while kinetic measurements made below pKa(RuIII-OH/OH2) = 1.3 were used to study the analogous interfacial reaction, where electron transfer was the only mechanistic step. Analysis of this data with a recently reported multichannel kinetic model was used to construct a PCET zone diagram and supported the assignment of an ET-PT mechanism at pH = 5-10. Ultimately, this study represents a unique example among Mox-OH/Mred-OH2 reactivity where the protonation and oxidation states of the intermediate were kinetically and spectrally resolved to firmly establish the PCET mechanism.
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Affiliation(s)
- Matthew C Kessinger
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Jeremiah Xu
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Kai Cui
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Quentin Loague
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Alexander V Soudackov
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Sharon Hammes-Schiffer
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Gerald J Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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3
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Song M, Wan Y, Si J, Yao Q, Man T, Mu Y, Huang Y, Zhu L, Zhu C, Deng S. Point-of-Care Diagnosis on Selenium Nutrition Based on Time-Resolved Fluorometric Glycoaffinity Chromatography. Anal Chem 2023; 95:14797-14804. [PMID: 37737115 DOI: 10.1021/acs.analchem.3c03032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
Given the lack of timely evaluation of the well-received selenium fortification, a neat lateral-flow chromatographic solution was constructed here by using the recently identified urinary selenosugar (Sel) as a strongly indicative marker. As there are no ready-made receptors for this synthetic standard, phenylboronic acid (PBA) esterification and Dolichos biflorus agglutinin (DBA) affinity joined up to pinch and pin down the analyte into a sandwich-type glycol complex. Pilot lectin screening on homemade glycan microarrays verified such a new pairing between dual recognizers as PBA-Sel-DBA with a firm monosaccharide-binding constant. To quell the sample autofluorescence, europium nanoparticles with efficient long-life afterglow were employed as conjugating probes under 1 μs excitation. After systematic process optimizations, the prepared Sel-dipstick achieved swift and sensitive fluorometry over the physiological level of the target from 0.1 to 10 μM with a detection limit down to 0.06 μM. Further efforts were made to eliminate matrix effects from both temperature and pH via an approximate formula. Upon completion, the test strips managed to quantify the presence of Sel in not just imitated but real human urine, with comparable results to those in the references. As far as we know, this would be the first in-house prototype for user-friendly and facile diagnosis of Se nutrition with fair accuracy as well as selectivity. Future endeavors will be invested to model a more traceable Se-supplementary plan based on the rhythmic feedback of Sel excretion.
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Affiliation(s)
- Meiyan Song
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Ying Wan
- School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Jingyi Si
- Department of Gastroenterology and Hepatology, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Qunyan Yao
- Department of Gastroenterology and Hepatology, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Tiantian Man
- School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Yao Mu
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Yaqi Huang
- School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Longyi Zhu
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Changfeng Zhu
- Department of Gastroenterology and Hepatology, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Shengyuan Deng
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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Shee M, Zhang D, Banerjee M, Roy S, Pal B, Anoop A, Yuan Y, Singh NDP. Interrogating bioinspired ESIPT/PCET-based Ir(iii)-complexes as organelle-targeted phototherapeutics: a redox-catalysis under hypoxia to evoke synergistic ferroptosis/apoptosis. Chem Sci 2023; 14:9872-9884. [PMID: 37736623 PMCID: PMC10510766 DOI: 10.1039/d3sc03096b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2023] [Accepted: 08/25/2023] [Indexed: 09/23/2023] Open
Abstract
Installing proton-coupled electron transfer (PCET) in Ir-complexes is indeed a newly explored phenomenon, offering high quantum efficiency and tunable photophysics; however, the prospects for its application in various fields, including interrogating biological systems, are quite open and exciting. Herein, we developed various organelle-targeted Ir(iii)-complexes by leveraging the photoinduced PCET process to see the opportunities in phototherapeutic application and investigate the underlying mechanisms of action (MOAs). We diversified the ligands' nature and also incorporated a H-bonded benzimidazole-phenol (BIP) moiety with π-conjugated ancillary ligands in Ir(iii) to study the excited-state intramolecular proton transfer (ESIPT) process for tuning dual emission bands and to tempt excited-state PCET. These visible or two-photon-NIR light activatable Ir-catalysts generate reactive hydroxyl radicals (˙OH) and simultaneously oxidize electron donating biomolecules (1,4-dihydronicotinamide adenine dinucleotide or glutathione) to disrupt redox homeostasis, downregulate the GPX4 enzyme, and amplify oxidative stress and lipid peroxide (LPO) accumulation. Our homogeneous photocatalytic platform efficiently triggers organelle dysfunction mediated by a Fenton-like pathway with spatiotemporal control upon illumination to evoke ferroptosis poised with the synergistic action of apoptosis in a hypoxic environment leading to cell death. Ir2 is the most efficient photochemotherapy agent among others, which provided profound cytophototoxicity to 4T1 and MCF-7 cancerous cells and inhibited solid hypoxic tumor growth in vitro and in vivo.
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Affiliation(s)
- Maniklal Shee
- Department of Chemistry, Indian Institute of Technology Kharagpur West Bengal-721302 India
| | - Dan Zhang
- School of Biomedical Sciences and Engineering, South China University of Technology, Guangzhou International Campus Guangzhou 511442 PR China
| | - Moumita Banerjee
- Department of Chemistry, Indian Institute of Technology Kharagpur West Bengal-721302 India
| | - Samrat Roy
- Department of Physics, Indian Institute of Science Education and Research Kolkata Mohanpur West Bengal 741246 India
| | - Bipul Pal
- Department of Physics, Indian Institute of Science Education and Research Kolkata Mohanpur West Bengal 741246 India
| | - Anakuthil Anoop
- Department of Chemistry, Indian Institute of Technology Kharagpur West Bengal-721302 India
| | - Youyong Yuan
- School of Biomedical Sciences and Engineering, South China University of Technology, Guangzhou International Campus Guangzhou 511442 PR China
| | - N D Pradeep Singh
- Department of Chemistry, Indian Institute of Technology Kharagpur West Bengal-721302 India
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5
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Wang R, Zhou X, Chen J, Chen Y, Xiong Y, Duan X, Liao X, Wang J. Ruthenium polypyridine complexes containing prenyl groups as antibacterial agents against Staphylococcus aureus through a membrane-disruption mechanism. Arch Pharm (Weinheim) 2023; 356:e2300175. [PMID: 37421212 DOI: 10.1002/ardp.202300175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Revised: 06/15/2023] [Accepted: 06/16/2023] [Indexed: 07/10/2023]
Abstract
Four new ruthenium polypyridyl complexes with prenyl groups, [Ru(bpy)2 (MHIP)](PF6 )2 (Ru(II)-1), [Ru(dtb)2 (MHIP)](PF6 )2 (Ru(II)-2), [Ru(dmb)2 (MHIP)](PF6 )2 (Ru(II)-3), and [Ru(dmob)2 (MHIP)](PF6 )2 (Ru(II)-4) (bpy = 2,2'-bipyridine, dtb = 4,4'-di-tert-butyl-2,2'-bipyridine, dmb = 4,4'-dimethyl-2,2'-bipyridine, dmob = 4,4'-dimethoxy-2,2'-bipyridine, and MHIP = 2-(2,6-dimethylhepta-1,5-dien-1-yl)-1H-imidazo[4,f][1,10]phenanthroline), were synthesized and characterized. Their antibacterial activities against Staphylococcus aureus were assessed, and the minimum inhibition concentration (MIC) value of Ru(II)-2 against S. aureus was only 0.5 µg/mL, showing the best antibacterial activity among them. S. aureus could be quickly killed by Ru(II)-2 in 30 min and Ru(II)-2 displayed an obvious inhibitive effect on the formation of a biofilm, which was essential to avoid the development of drug-resistance. Meanwhile, Ru(II)-2 exhibited a stable MIC value against antibiotic-resistant bacteria. The antibacterial mechanism of Ru(II)-2 was probably related to depolarization of the cell membrane, and a change of permeability was associated with the formation of reactive oxygen species, leading to leakage of nucleic acid and bacterial death. Furthermore, Ru(II)-2 hardly showed toxicity to mammalian cells and the Galleria mellonella worm. Finally, murine infection studies also illustrated that Ru(II)-2 was highly effective against S. aureus in vivo.
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Affiliation(s)
- Runbin Wang
- School of Pharmacy, Jiangxi Science & Technology Normal University, Nanchang, China
| | - Xiaomin Zhou
- Shenzhen Second People's Hospital, Shenzhen, China
| | - Jingjing Chen
- School of Pharmacy, Jiangxi Science & Technology Normal University, Nanchang, China
| | - Yushou Chen
- School of Pharmacy, Jiangxi Science & Technology Normal University, Nanchang, China
| | - Yanshi Xiong
- School of Pharmacy, Jiangxi Science & Technology Normal University, Nanchang, China
| | - Xuemin Duan
- School of Pharmacy, Jiangxi Science & Technology Normal University, Nanchang, China
| | - Xiangwen Liao
- School of Pharmacy, Jiangxi Science & Technology Normal University, Nanchang, China
| | - Jintao Wang
- School of Pharmacy, Jiangxi Science & Technology Normal University, Nanchang, China
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6
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Zhao Z, Liu M, Zhou K, Guo L, Shen Y, Lu D, Hong X, Bao Z, Yang Q, Ren Q, Schreiner PR, Zhang Z. Visible-Light-Induced Phenoxyl Radical-based Metal-Organic Framework for Selective Photooxidation of Sulfides. ACS APPLIED MATERIALS & INTERFACES 2023; 15:6982-6989. [PMID: 36715584 DOI: 10.1021/acsami.2c21304] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Phenoxyl radicals originating from phenols through oxidation or photoinduction are relatively stable and exhibit mild oxidative activity, which endows them with the potential for photocatalysis. Herein, a stable and recyclable metal-organic framework Zr-MOF-OH constructed of a binaphthol derivative ligand has been synthesized and functions as an efficient heterogeneous photocatalyst. Zr-MOF-OH shows fairly good catalytic activity and substrate compatibility toward the selective oxidation of sulfides to sulfoxides under visible light irradiation. Such irradiation of Zr-MOF-OH converts the phenolic hydroxyl groups of the binaphthol derivative ligand to phenoxyl radicals through excited state intramolecular proton transfer, and the excited state photocatalyst triggers the single-electron oxidation of the sulfide. No reactive oxygen species are produced in the photocatalytic process, and triplet O2 directly participates in the reaction, endowing Zr-MOF-OH with wide substrate compatibility and high selectivity, which also proposes a promising pathway for the direct activation of substrates via phenoxyl radicals.
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Affiliation(s)
- Zhenghua Zhao
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, P. R. China
- Institute of Zhejiang University-Quzhou, Quzhou 324000, P. R. China
| | - Mingjie Liu
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, P. R. China
- Institute of Zhejiang University-Quzhou, Quzhou 324000, P. R. China
| | - Kai Zhou
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, P. R. China
- Institute of Zhejiang University-Quzhou, Quzhou 324000, P. R. China
| | - Lidong Guo
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, P. R. China
- Institute of Zhejiang University-Quzhou, Quzhou 324000, P. R. China
| | - Yajing Shen
- Institute of Zhejiang University-Quzhou, Quzhou 324000, P. R. China
| | - Dan Lu
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, P. R. China
| | - Xin Hong
- Department of Chemistry, Zhejiang University, Hangzhou 310058, P. R. China
| | - Zongbi Bao
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, P. R. China
- Institute of Zhejiang University-Quzhou, Quzhou 324000, P. R. China
| | - Qiwei Yang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, P. R. China
- Institute of Zhejiang University-Quzhou, Quzhou 324000, P. R. China
| | - Qilong Ren
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, P. R. China
- Institute of Zhejiang University-Quzhou, Quzhou 324000, P. R. China
| | - Peter R Schreiner
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
| | - Zhiguo Zhang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, P. R. China
- Institute of Zhejiang University-Quzhou, Quzhou 324000, P. R. China
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7
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Gotico P, Herrero C, Protti S, Quaranta A, Sheth S, Fallahpour R, Farran R, Halime Z, Sircoglou M, Aukauloo A, Leibl W. Proton-controlled Action of an Imidazole as Electron Relay in a Photoredox Triad. Photochem Photobiol Sci 2022; 21:247-259. [PMID: 34988933 DOI: 10.1007/s43630-021-00163-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 12/18/2021] [Indexed: 11/24/2022]
Abstract
Electron relays play a crucial role for efficient light-induced activation by a photo-redox moiety of catalysts for multi-electronic transformations. Their insertion between the two units reduces detrimental energy transfer quenching while establishing at the same time unidirectional electron flow. This rectifying function allows charge accumulation necessary for catalysis. Mapping these events in photophysical studies is an important step towards the development of efficient molecular photocatalysts. Three modular complexes comprised of a Ru-chromophore, an imidazole electron relay function, and a terpyridine unit as coordination site for a metal ion were synthesized and the light-induced electron transfer events studied by laser flash photolysis. In all cases, formation of an imidazole radical by internal electron transfer to the oxidized chromophore was observed. The effect of added base evidenced that the reaction sequence depends strongly on the possibility for deprotonation of the imidazole function in a proton-coupled electron transfer process. In the complex with MnII present as a proxy for a catalytic site, a strongly accelerated decay of the imidazole radical together with a decreased rate of back electron transfer from the external electron acceptor to the oxidized complex was observed. This transient formation of an imidazolyl radical is clear evidence for the function of the imidazole group as an electron relay. The implication of the imidazole proton and the external base for the kinetics and energetics of the electron trafficking is discussed.
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Affiliation(s)
- Philipp Gotico
- Institut de Biologie Intégrative de La Cellule (I2BC), Université Paris Saclay, CEA, CNRS, 91191, Gif-sur-Yvette, France
| | - Christian Herrero
- Institut de Chimie Moléculaire Et Des Matériaux d'Orsay (ICMMO), Université Paris Saclay, 91405, Orsay, France
| | - Stefano Protti
- PhotoGreen Lab, Department of Chemistry, University of Pavia, 27100, Pavia, Italy
| | - Annamaria Quaranta
- Institut de Biologie Intégrative de La Cellule (I2BC), Université Paris Saclay, CEA, CNRS, 91191, Gif-sur-Yvette, France
| | - Sujitraj Sheth
- Institut de Biologie Intégrative de La Cellule (I2BC), Université Paris Saclay, CEA, CNRS, 91191, Gif-sur-Yvette, France
| | - Reza Fallahpour
- Department of Chemistry, University of Zürich UZH, Freiestrasse 3, CH-3012, Bern, Switzerland
| | - Rajaa Farran
- Institut de Biologie Intégrative de La Cellule (I2BC), Université Paris Saclay, CEA, CNRS, 91191, Gif-sur-Yvette, France.,Lebanese International University, Mazraa, Beirut, 146404, Lebanon
| | - Zakaria Halime
- Institut de Chimie Moléculaire Et Des Matériaux d'Orsay (ICMMO), Université Paris Saclay, 91405, Orsay, France
| | - Marie Sircoglou
- Institut de Chimie Moléculaire Et Des Matériaux d'Orsay (ICMMO), Université Paris Saclay, 91405, Orsay, France
| | - Ally Aukauloo
- Institut de Chimie Moléculaire Et Des Matériaux d'Orsay (ICMMO), Université Paris Saclay, 91405, Orsay, France
| | - Winfried Leibl
- Institut de Biologie Intégrative de La Cellule (I2BC), Université Paris Saclay, CEA, CNRS, 91191, Gif-sur-Yvette, France.
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8
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Kim S, Choi J, Cho DW, Ahn M, Eom S, Kim J, Wee KR, Ihee H. Solvent-modulated proton-coupled electron transfer in an iridium complex with an ESIPT ligand. Chem Sci 2022; 13:3809-3818. [PMID: 35432886 PMCID: PMC8966730 DOI: 10.1039/d1sc07250a] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 03/03/2022] [Indexed: 11/21/2022] Open
Abstract
Proton-coupled electron transfer (PCET), an essential process in nature with a well-known example of photosynthesis, has recently been employed in metal complexes to improve the energy conversion efficiency; however, a profound understanding of the mechanism of PCET in metal complexes is still lacking. In this study, we synthesized cyclometalated Ir complexes strategically designed to exploit the excited-state intramolecular proton transfer (ESIPT) of the ancillary ligand and studied their photoinduced PCET in both aprotic and protic solvent environments using femtosecond transient absorption spectroscopy and density functional theory (DFT) and time-dependent DFT calculations. The data reveal solvent-modulated PCET, where charge transfer follows proton transfer in an aprotic solvent and the temporal order of charge transfer and proton transfer is reversed in a protic solvent. In the former case, ESIPT from the enol form to the keto form, which precedes the charge transfer from Ir to the ESIPT ligand, improves the efficiency of metal-to-ligand charge transfer. This finding demonstrates the potential to control the PCET reaction in the desired direction and the efficiency of charge transfer by simply perturbing the external hydrogen-bonding network with the solvent. The iridium complex with an ESIPT ligand shows solvent-modulated proton-coupled electron transfer, in which the temporal order of proton transfer and charge transfer is altered by the solvent environment.![]()
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Affiliation(s)
- Siin Kim
- Department of Chemistry and KI for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea
- Center for Advanced Reaction Dynamics, Institute for Basic Science Daejeon 34141 Republic of Korea
| | - Jungkweon Choi
- Department of Chemistry and KI for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea
- Center for Advanced Reaction Dynamics, Institute for Basic Science Daejeon 34141 Republic of Korea
| | - Dae Won Cho
- Department of Advanced Materials Chemistry, Korea University, Sejong Campus Sejong 30019 Korea
| | - Mina Ahn
- Department of Chemistry and Institute of Natural Science, Daegu University Gyeongsan 38453 Republic of Korea
| | - Seunghwan Eom
- Department of Chemistry and KI for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea
- Center for Advanced Reaction Dynamics, Institute for Basic Science Daejeon 34141 Republic of Korea
| | - Jungmin Kim
- Department of Chemistry and KI for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea
- Center for Advanced Reaction Dynamics, Institute for Basic Science Daejeon 34141 Republic of Korea
| | - Kyung-Ryang Wee
- Department of Chemistry and Institute of Natural Science, Daegu University Gyeongsan 38453 Republic of Korea
| | - Hyotcherl Ihee
- Department of Chemistry and KI for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea
- Center for Advanced Reaction Dynamics, Institute for Basic Science Daejeon 34141 Republic of Korea
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9
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Singh B, Singh A, Yadav A, Indra A. Modulating electronic structure of metal-organic framework derived catalysts for electrochemical water oxidation. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214144] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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10
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Chen L, Fournier JA. Probing Hydrogen-Bonding Interactions within Phenol-Benzimidazole Proton-Coupled Electron Transfer Model Complexes with Cryogenic Ion Vibrational Spectroscopy. J Phys Chem A 2021; 125:9288-9297. [PMID: 34652915 DOI: 10.1021/acs.jpca.1c05879] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Hydrogen-bonding interactions within a series of phenol-benzimidazole model proton-coupled electron transfer (PCET) dyad complexes are characterized using cryogenic ion vibrational spectroscopy. A highly red-shifted and surprisingly broad (>1000 cm-1) transition is observed in one of the models and assigned to the phenolic OH stretch strongly H-bonded to the N(3) benzimidazole atom. The breadth is attributed to a combination of anharmonic Fermi-resonance coupling between the OH stretch and background doorway states involving OH bending modes and strong coupling of the OH stretch frequency to structural deformations along the proton-transfer coordinate accessible at the vibrational zero-point level. The other models show unexpected protonation of the benzimidazole group upon electrospray ionization instead of at more basic remote amine/amide groups. This leads to the formation of HO-+HN(3) H-bond motifs that are much weaker than the OH-N(3) H-bond arrangement. H-bonding between the N(1)H+ benzimidazole group and the carbonyl on the tyrosine backbone is the stronger and preferred interaction in these complexes. The results show that conjugation effects, secondary H-bond interactions, and H-bond soft modes strongly influence the OH-N(3) interaction and highlight the importance of the direct monitoring of proton stretch transitions in characterizing the proton-transfer reaction coordinate in PCET systems.
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Affiliation(s)
- Liangyi Chen
- Department of Chemistry, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Joseph A Fournier
- Department of Chemistry, Washington University in St. Louis, St. Louis, Missouri 63130, United States
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11
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Sayre H, Ripberger HH, Odella E, Zieleniewska A, Heredia DA, Rumbles G, Scholes GD, Moore TA, Moore AL, Knowles RR. PCET-Based Ligand Limits Charge Recombination with an Ir(III) Photoredox Catalyst. J Am Chem Soc 2021; 143:13034-13043. [PMID: 34378919 DOI: 10.1021/jacs.1c01701] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Upon photoinitiated electron transfer, charge recombination limits the quantum yield of photoredox reactions for which the rates for the forward reaction and back electron transfer are competitive. Taking inspiration from a proton-coupled electron transfer (PCET) process in Photosystem II, a benzimidazole-phenol (BIP) has been covalently attached to the 2,2'-bipyridyl ligand of [Ir(dF(CF3)ppy)2(bpy)][PF6] (dF(CF3)ppy = 2-(2,4-difluorophenyl)-5-(trifluoromethyl)pyridine; bpy = 2,2'-bipyridyl). Excitation of the [Ir(dF(CF3)ppy)2(BIP-bpy)][PF6] photocatalyst results in intramolecular PCET to form a charge-separated state with oxidized BIP. Subsequent reduction of methyl viologen dication (MV2+), a substrate surrogate, by the reducing moiety of the charge separated species demonstrates that the inclusion of BIP significantly slows the charge recombination rate. The effect of ∼24-fold slower charge recombination in a photocatalytic phthalimide ester reduction resulted in a greater than 2-fold increase in reaction quantum efficiency.
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Affiliation(s)
- Hannah Sayre
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Hunter H Ripberger
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Emmanuel Odella
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Anna Zieleniewska
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Daniel A Heredia
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Garry Rumbles
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Gregory D Scholes
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Thomas A Moore
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Ana L Moore
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Robert R Knowles
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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12
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Follana-Berná J, Farran R, Leibl W, Quaranta A, Sastre-Santos Á, Aukauloo A. Phthalocyanine as a Bioinspired Model for Chlorophyll f-Containing Photosystem II Drives Photosynthesis into the Far-Red Region. Angew Chem Int Ed Engl 2021; 60:12284-12288. [PMID: 33600039 DOI: 10.1002/anie.202101051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Indexed: 11/09/2022]
Abstract
The textbook explanation that P680 pigments are the red limit to drive oxygenic photosynthesis must be reconsidered by the recent discovery that chlorophyll f (Chlf)-containing Photosystem II (PSII) absorbing at 727 nm can drive water oxidation. Two different families of unsymmetrically substituted Zn phthalocyanines (Pc) absorbing in the 700-800 nm spectral window and containing a fused imidazole-phenyl substituent or a fused imidazole-hydroxyphenyl group have been synthetized and characterized as a bioinspired model of the Chlf/TyrosineZ /Histidine190 cofactors of PSII. Transient absorption studies in the presence of an electron acceptor and irradiating in the far-red region evidenced an intramolecular electron transfer process. Visible and FT-IR signatures indicate the formation of a hydrogen-bonded phenoxyl radical in ZnPc II-OH. This study sets the foundation for the utilization of a broader spectral window for multi-electronic catalytic processes with one of the most robust and efficient dyes.
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Affiliation(s)
- Jorge Follana-Berná
- División de Química Orgánica, Instituto de Bioingeniería, Universidad Miguel Hernández, Avda. de la Universidad s/n, 03203, Elche, Spain
| | - Rajaa Farran
- Université Paris-Saclay, Institute for integrative Biology of the Cell (I2BC), CEA, CNRS, UMR 9198, 91191, Gif-sur-Yvette, France
| | - Winfried Leibl
- Université Paris-Saclay, Institute for integrative Biology of the Cell (I2BC), CEA, CNRS, UMR 9198, 91191, Gif-sur-Yvette, France
| | - Annamaria Quaranta
- Université Paris-Saclay, Institute for integrative Biology of the Cell (I2BC), CEA, CNRS, UMR 9198, 91191, Gif-sur-Yvette, France
| | - Ángela Sastre-Santos
- División de Química Orgánica, Instituto de Bioingeniería, Universidad Miguel Hernández, Avda. de la Universidad s/n, 03203, Elche, Spain
| | - Ally Aukauloo
- Université Paris-Saclay, ICMMO, CNRS, UMR 8182, 91405, Orsay Cedex, France.,Université Paris-Saclay, Institute for integrative Biology of the Cell (I2BC), CEA, CNRS, UMR 9198, 91191, Gif-sur-Yvette, France
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13
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Follana‐Berná J, Farran R, Leibl W, Quaranta A, Sastre‐Santos Á, Aukauloo A. Phthalocyanine as a Bioinspired Model for Chlorophyll
f
‐Containing Photosystem II Drives Photosynthesis into the Far‐Red Region. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202101051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jorge Follana‐Berná
- División de Química Orgánica, Instituto de Bioingeniería Universidad Miguel Hernández Avda. de la Universidad s/n 03203 Elche Spain
| | - Rajaa Farran
- Université Paris-Saclay Institute for integrative Biology of the Cell (I2BC), CEA CNRS, UMR 9198 91191 Gif-sur-Yvette France
| | - Winfried Leibl
- Université Paris-Saclay Institute for integrative Biology of the Cell (I2BC), CEA CNRS, UMR 9198 91191 Gif-sur-Yvette France
| | - Annamaria Quaranta
- Université Paris-Saclay Institute for integrative Biology of the Cell (I2BC), CEA CNRS, UMR 9198 91191 Gif-sur-Yvette France
| | - Ángela Sastre‐Santos
- División de Química Orgánica, Instituto de Bioingeniería Universidad Miguel Hernández Avda. de la Universidad s/n 03203 Elche Spain
| | - Ally Aukauloo
- Université Paris-Saclay ICMMO CNRS, UMR 8182 91405 Orsay Cedex France
- Université Paris-Saclay Institute for integrative Biology of the Cell (I2BC), CEA CNRS, UMR 9198 91191 Gif-sur-Yvette France
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14
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Carreño A, Gacitúa M, Solis-Céspedes E, Páez-Hernández D, Swords WB, Meyer GJ, Preite MD, Chávez I, Vega A, Fuentes JA. New Cationic fac-[Re(CO) 3(deeb)B2] + Complex, Where B2 Is a Benzimidazole Derivative, as a Potential New Luminescent Dye for Proteins Separated by SDS-PAGE. Front Chem 2021; 9:647816. [PMID: 33842435 PMCID: PMC8027506 DOI: 10.3389/fchem.2021.647816] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 01/29/2021] [Indexed: 01/14/2023] Open
Abstract
Sodium-dodecyl-sulfate polyacrylamide gel electrophoresis (SDS-PAGE) can be used to separate proteins based mainly on their size such as in denaturing gels. Different staining methods have been reported to observe proteins in the gel matrix, where the most used dyes are generally anionic. Anionic dyes allow for interactions with protonated amino acids, retaining the dye in the proteins. Fluorescent staining is an alternative technique considered to be sensitive, safe, and versatile. Some anionic complexes based on d6 transition metals have been used for this purpose, where cationic dyes have been less explored in this context. In this work, we synthesized and characterized a new monocationic rhenium complex fac-[Re(CO)3(deeb)B2]+ (where deeb is 4,4′-bis(ethoxycarbonyl)-2,2′-bpy and B2 is 2,4-di-tert-butyl-6-(3H-imidazo[4,5-c]pyridine-2-yl)phenol). We carried out a structural characterization of this complex by MS+, FTIR, 1H NMR, D2O exchange, and HHCOSY. Moreover, we carried out UV-Vis, luminescence, and cyclic voltammetry experiments to understand the effect of ligands on the complex’s electronic structure. We also performed relativistic theoretical calculations using the B3LYP/TZ2P level of theory and R-TDDFT within a dielectric continuum model (COSMO) to better understand electronic transitions and optical properties. We finally assessed the potential of fac-[Re(CO)3(deeb)B2]+ (as well as the precursor fac-Re(CO)3(deeb)Br and the free ligand B2) to stain proteins separated by SDS-PAGE. We found that only fac-[Re(CO)3(deeb)B2]+ proved viable to be directly used as a luminescent dye for proteins, presumably due to its interaction with negatively charged residues in proteins and by weak interactions provided by B2. In addition, fac-[Re(CO)3(deeb)B2]+ seems to interact preferentially with proteins and not with the gel matrix despite the presence of sodium dodecyl sulfate (SDS). In future applications, these alternative cationic complexes might be used alone or in combination with more traditional anionic compounds to generate counterion dye stains to improve the process.
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Affiliation(s)
- Alexander Carreño
- Center of Applied NanoSciences (CANS), Facultad de Ciencias Exactas, Universidad Andres Bello, Santiago, Chile
| | | | - Eduardo Solis-Céspedes
- Escuela de Bioingeniería Médica, Facultad de Medicina, Universidad Católica del Maule, Talca, Chile.,Laboratorio de Bioinformática y Química Computacional, Facultad de Medicina, Universidad Católica del Maule, Talca, Chile
| | - Dayán Páez-Hernández
- Center of Applied NanoSciences (CANS), Facultad de Ciencias Exactas, Universidad Andres Bello, Santiago, Chile
| | - Wesley B Swords
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Gerald J Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Marcelo D Preite
- Departamento de Química Orgánica, Facultad de Química y Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Ivonne Chávez
- Departamento de Química Inorgánica, Facultad de Química y Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Andrés Vega
- Departamento de Ciencias Químicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Viña del Mar, Chile.,Centro para el Desarrollo de la Nanociencia y la Nanotecnología Cedenna, Santiago, Chile
| | - Juan A Fuentes
- Laboratorio de Genética y Patogénesis Bacteriana, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile
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15
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Guerra WD, Odella E, Secor M, Goings JJ, Urrutia MN, Wadsworth BL, Gervaldo M, Sereno LE, Moore TA, Moore GF, Hammes-Schiffer S, Moore AL. Role of Intact Hydrogen-Bond Networks in Multiproton-Coupled Electron Transfer. J Am Chem Soc 2020; 142:21842-21851. [DOI: 10.1021/jacs.0c10474] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Walter D. Guerra
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - Emmanuel Odella
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - Maxim Secor
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
| | - Joshua J. Goings
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
| | - María N. Urrutia
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - Brian L. Wadsworth
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - Miguel Gervaldo
- Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Agencia Postal No. 3, 5800 Río Cuarto, Córdoba, Argentina
| | - Leónides E. Sereno
- Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Agencia Postal No. 3, 5800 Río Cuarto, Córdoba, Argentina
| | - Thomas A. Moore
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - Gary F. Moore
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - Sharon Hammes-Schiffer
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
| | - Ana L. Moore
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287-1604, United States
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16
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Luque-Urrutia JA, Solà M, Poater A. The influence of the pH on the reaction mechanism of water oxidation by a Ru(bda) catalyst. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.12.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Koronkiewicz B, Swierk J, Regan K, Mayer JM. Shallow Distance Dependence for Proton-Coupled Tyrosine Oxidation in Oligoproline Peptides. J Am Chem Soc 2020; 142:12106-12118. [PMID: 32510937 PMCID: PMC7545454 DOI: 10.1021/jacs.0c01429] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
We have explored the kinetic effect of increasing electron transfer (ET) distance in a biomimetic, proton-coupled electron-transfer (PCET) system. Biological ET often occurs simultaneously with proton transfer (PT) in order to avoid the high-energy, charged intermediates resulting from the stepwise transfer of protons and electrons. These concerted proton-electron-transfer (CPET) reactions are implicated in numerous biological ET pathways. In many cases, PT is coupled to long-range ET. While many studies have shown that the rate of ET is sensitive to the distance between the electron donor and acceptor, extensions to biological CPET reactions are sparse. The possibility of a unique ET distance dependence for CPET reactions deserves further exploration, as this could have implications for how we understand biological ET. We therefore explored the ET distance dependence for the CPET oxidation of tyrosine in a model system. We prepared a series of metallopeptides with a tyrosine separated from a Ru(bpy)32+ complex by an oligoproline bridge of increasing length. Rate constants for intramolecular tyrosine oxidation were measured using the flash-quench transient absorption technique in aqueous solutions. The rate constants for tyrosine oxidation decreased by 125-fold with three added proline residues between tyrosine and the oxidant. By comparison, related intramolecular ET rate constants in very similar constructs were reported to decrease by 4-5 orders of magnitude over the same number of prolines. The observed shallow distance dependence for tyrosine oxidation is proposed to originate in part from the requirement for stronger oxidants, leading to a smaller hole-transfer effective tunneling barrier height. The shallow distance dependence observed here and extensions to distance-dependent CPET reactions have potential implications for long-range charge transfers.
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Affiliation(s)
- Brian Koronkiewicz
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
| | - John Swierk
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
| | - Kevin Regan
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
| | - James M Mayer
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
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18
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Morawski OW, Kielesiński Ł, Gryko DT, Sobolewski AL. Highly Polarized Coumarin Derivatives Revisited: Solvent-Controlled Competition Between Proton-Coupled Electron Transfer and Twisted Intramolecular Charge Transfer. Chemistry 2020; 26:7281-7291. [PMID: 32212353 DOI: 10.1002/chem.202001079] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 03/24/2020] [Indexed: 11/08/2022]
Abstract
Linking a polarized coumarin unit with an aromatic substituent via an amide bridge results in weak electronic coupling that affects the intramolecular electron-transfer (ET) process. As a result of this, interesting solvent-dependent photophysical properties can be observed. In polar solvents, electron transfer in coumarin derivatives of this type induces a mutual twist of the electron-donating and -accepting molecular units (TICT process) that facilitates radiationless decay processes (internal conversion). In the dyad with the strongest intramolecular hydrogen bond, the planar form is stabilized, such that twisting can only occur in highly polar solvents, whereas a fast proton-coupled electron-transfer (PCET process) occurs in nonpolar n-alkanes. The kPCET rate constant decreases linearly with the energy of the fluorescence maximum in different solvents. This observation can be explained in terms of competition between electron- and proton-transfer from a highly polarized (ca. 15 D) and fluorescent locally excited (1 LE) state to a much less polarized (ca. 4 D) charge-transfer (1 CT) state, a unique occurrence. Photophysical measurements performed for a family of related coumarin dyads, together with results of quantum-chemical computations, give insight into the mechanism of the ET process, which is followed by either a TICT or a PCET process. Our results reveal that dielectric solvation of the excited state slows down the PCET process, even in nonpolar solvents.
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Affiliation(s)
- Olaf W Morawski
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668, Warsaw, Poland
| | - Łukasz Kielesiński
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668, Warsaw, Poland.,Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
| | - Daniel T Gryko
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
| | - Andrzej L Sobolewski
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668, Warsaw, Poland
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19
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Singh B, Indra A. Designing Self‐Supported Metal‐Organic Framework Derived Catalysts for Electrochemical Water Splitting. Chem Asian J 2020; 15:607-623. [DOI: 10.1002/asia.201901810] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 01/30/2020] [Indexed: 01/07/2023]
Affiliation(s)
- Baghendra Singh
- Department of ChemistryIndian Institute of Technology (BHU) Varanasi Uttar Pradesh 221005 India
| | - Arindam Indra
- Department of ChemistryIndian Institute of Technology (BHU) Varanasi Uttar Pradesh 221005 India
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20
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Goldsmith ZK, Soudackov AV, Hammes-Schiffer S. Theoretical analysis of the inverted region in photoinduced proton-coupled electron transfer. Faraday Discuss 2019; 216:363-378. [PMID: 31017599 DOI: 10.1039/c8fd00240a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Photoinduced proton-coupled electron transfer (PCET) plays a key role in a wide range of energy conversion processes, and understanding how to design systems to control the PCET rate constant is a significant challenge. Herein a theoretical formulation of PCET is utilized to identify the conditions under which photoinduced PCET may exhibit inverted region behavior. In the inverted region, the rate constant decreases as the driving force increases even though the reaction becomes more thermodynamically favorable. Photoinduced PCET will exhibit inverted region behavior when the following criteria are satisfied: (1) the overlap integrals corresponding to the ground reactant and the excited product proton vibrational wavefunctions become negligible for a low enough product vibronic state and (2) the reaction free energies associated with the lower excited product proton vibrational wavefunctions contributing significantly to the rate constant are negative with magnitudes greater than the reorganization energy. These criteria are typically not satisfied by harmonic or Morse potentials but are satisfied by more realistic asymmetric double well potentials because the proton vibrational states above the barrier correspond to more delocalized proton vibrational wavefunctions with nodal structures leading to destructive interference effects. Thus, this theoretical analysis predicts that inverted region behavior could be observed for systems with asymmetric double well potentials characteristic of hydrogen-bonded systems and that the hydrogen/deuterium kinetic isotope effect will approach unity and could even become inverse in this region due to the oscillatory nature of the highly excited vibrational wavefunctions. These insights may help guide the design of more effective energy conversion devices.
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Affiliation(s)
- Zachary K Goldsmith
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, USA.
| | - Alexander V Soudackov
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, USA.
| | - Sharon Hammes-Schiffer
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, USA.
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21
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22
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A stable dye-sensitized photoelectrosynthesis cell mediated by a NiO overlayer for water oxidation. Proc Natl Acad Sci U S A 2019; 117:12564-12571. [PMID: 31488721 DOI: 10.1073/pnas.1821687116] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
In the development of photoelectrochemical cells for water splitting or CO2 reduction, a major challenge is O2 evolution at photoelectrodes that, in behavior, mimic photosystem II. At an appropriate semiconductor electrode, a water oxidation catalyst must be integrated with a visible light absorber in a stable half-cell configuration. Here, we describe an electrode consisting of a light absorber, an intermediate electron donor layer, and a water oxidation catalyst for sustained light driven water oxidation catalysis. In assembling the electrode on nanoparticle SnO2/TiO2 electrodes, a Ru(II) polypyridyl complex was used as the light absorber, NiO was deposited as an overlayer, and a Ru(II) 2,2'-bipyridine-6,6'-dicarboxylate complex as the water oxidation catalyst. In the final electrode, addition of the NiO overlayer enhanced performance toward water oxidation with the final electrode operating with a 1.1 mA/cm2 photocurrent density for 2 h without decomposition under one sun illumination in a pH 4.65 solution. We attribute the enhanced performance to the role of NiO as an electron transfer mediator between the light absorber and the catalyst.
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23
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Schneider J, Bangle RE, Swords WB, Troian-Gautier L, Meyer GJ. Determination of Proton-Coupled Electron Transfer Reorganization Energies with Application to Water Oxidation Catalysts. J Am Chem Soc 2019; 141:9758-9763. [DOI: 10.1021/jacs.9b01296] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Jenny Schneider
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill 27599, United States
| | - Rachel E. Bangle
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill 27599, United States
| | - Wesley B. Swords
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill 27599, United States
| | - Ludovic Troian-Gautier
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill 27599, United States
| | - Gerald J. Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill 27599, United States
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24
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Teixeira RI, Goulart JS, Corrêa RJ, Garden SJ, Ferreira SB, Netto-Ferreira JC, Ferreira VF, Miro P, Marin ML, Miranda MA, de Lucas NC. A photochemical and theoretical study of the triplet reactivity of furano- and pyrano-1,4-naphthoquionones towards tyrosine and tryptophan derivatives. RSC Adv 2019; 9:13386-13397. [PMID: 35519567 PMCID: PMC9063979 DOI: 10.1039/c9ra01939a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Accepted: 04/22/2019] [Indexed: 01/08/2023] Open
Abstract
The photochemical reactivity of the triplet state of pyrano- and furano-1,4-naphthoquinone derivatives (1 and 2) has been examined employing nanosecond laser flash photolysis. The quinone triplets were efficiently quenched by l-tryptophan methyl ester hydrochloride, l-tyrosine methyl ester hydrochloride, N-acetyl-l-tryptophan methyl ester and N-acetyl-l-tyrosine methyl ester, substituted phenols and indole (k q ∼109 L mol-1 s-1). For all these quenchers new transients were formed in the quenching process. These were assigned to the corresponding radical pairs that resulted from a coupled electron/proton transfer from the phenols, indole, amino acids, or their esters, to the excited state of the quinone. The proton coupled electron transfer (PCET) mechanism is supported by experimental rate constants, isotopic effects and theoretical calculations. The calculations revealed differences between the hydrogen abstraction reactions of phenol and indole substrates. For the latter, the calculations indicate that electron transfer and proton transfer occur as discrete steps.
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Affiliation(s)
- Rodolfo I Teixeira
- Instituto de Química - Universidade Federal do Rio de Janeiro Cidade Universitária RJ Brazil
| | - Juliana S Goulart
- Instituto de Química - Universidade Federal do Rio de Janeiro Cidade Universitária RJ Brazil
| | - Rodrigo J Corrêa
- Instituto de Química - Universidade Federal do Rio de Janeiro Cidade Universitária RJ Brazil
| | - Simon J Garden
- Instituto de Química - Universidade Federal do Rio de Janeiro Cidade Universitária RJ Brazil
| | - Sabrina B Ferreira
- Instituto de Química - Universidade Federal do Rio de Janeiro Cidade Universitária RJ Brazil
| | | | - Vitor F Ferreira
- Universidade Federal Fluminense, Faculdade de Farmácia, Departamento de Tecnologia Farmaceûtica Niterói Santa Rosa Brazil
| | - Paula Miro
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas Valencia Spain
| | - M Luisa Marin
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas Valencia Spain
| | - Miguel A Miranda
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas Valencia Spain
| | - Nanci C de Lucas
- Instituto de Química - Universidade Federal do Rio de Janeiro Cidade Universitária RJ Brazil
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25
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Richmond CJ, Escayola S, Poater A. Axial Ligand Effects of Ru-BDA Complexes in the O-O Bond Formation via the I2M Bimolecular Mechanism in Water Oxidation Catalysis. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801450] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Craig J. Richmond
- Level 5; RMIT Europe Media-TIC Building; c/ Roc Boronat, 117 08018 Barcelona Catalonia Spain
| | - Sílvia Escayola
- Institut de Química Computacional i Catàlisi and Departament de Química; Universitat de Girona; c/ Maria Aurèlia Capmany 69 17003 Girona Catalonia Spain
| | - Albert Poater
- Institut de Química Computacional i Catàlisi and Departament de Química; Universitat de Girona; c/ Maria Aurèlia Capmany 69 17003 Girona Catalonia Spain
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26
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Pannwitz A, Wenger OS. Recent advances in bioinspired proton-coupled electron transfer. Dalton Trans 2019; 48:5861-5868. [DOI: 10.1039/c8dt04373f] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Fundamental aspects of PCET continue to attract attention. Understanding this reaction type is desirable for small-molecule activation and solar energy conversion.
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Affiliation(s)
- Andrea Pannwitz
- Department of Chemistry
- University of Basel
- 4056 Basel
- Switzerland
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27
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Mathew R, Kayal S, Yapamanu AL. Excited state structural dynamics of 4-cyano-4′-hydroxystilbene: deciphering the signatures of proton-coupled electron transfer using ultrafast Raman loss spectroscopy. Phys Chem Chem Phys 2019; 21:22409-22419. [DOI: 10.1039/c9cp02923k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photo-initiated proton-coupled electron transfer process in the 4-cyano-4′-hydroxystilbene–tert-butylamine adduct strongly affects the excited-state structural dynamics of CHSB.
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Affiliation(s)
- Reshma Mathew
- School of Chemistry
- Indian Institute of Science Education and Research Thiruvananthapuram
- Thiruvananthapuram 695551
- India
| | - Surajit Kayal
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560012
- India
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28
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Indra A, Song T, Paik U. Metal Organic Framework Derived Materials: Progress and Prospects for the Energy Conversion and Storage. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1705146. [PMID: 29984451 DOI: 10.1002/adma.201705146] [Citation(s) in RCA: 177] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 11/30/2017] [Indexed: 06/08/2023]
Abstract
Exploring new materials with high efficiency and durability is the major requirement in the field of sustainable energy conversion and storage systems. Numerous techniques have been developed in last three decades to enhance the efficiency of the catalyst systems, control over the composition, structure, surface area, pore size, and moreover morphology of the particles. In this respect, metal organic framework (MOF) derived catalysts are emerged as the finest materials with tunable properties and activities for the energy conversion and storage. Recently, several nano- or microstructures of metal oxides, chalcogenides, phosphides, nitrides, carbides, alloys, carbon materials, or their hybrids are explored for the electrochemical energy conversion like oxygen evolution, hydrogen evolution, oxygen reduction, or battery materials. Interest on the efficient energy storage system is also growing looking at the practical applications. Though, several reviews are available on the synthesis and application of MOF and MOF derived materials, their applications for the electrochemical energy conversion and storage is totally a new field of research and developed recently. This review focuses on the systematic design of the materials from MOF and control over their inherent properties to enhance the electrochemical performances.
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Affiliation(s)
- Arindam Indra
- Department of Energy Engineering, Hanyang University, Seoul, 133-791, Republic of Korea
| | - Taeseup Song
- Department of Energy Engineering, Hanyang University, Seoul, 133-791, Republic of Korea
| | - Ungyu Paik
- Department of Energy Engineering, Hanyang University, Seoul, 133-791, Republic of Korea
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29
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Qu J, Xia Q, Ji W, Jing S, Zhu D, Li L, Huang L, An Z, Xin C, Ni Y, Li M, Jia J, Song Y, Huang W. A ferrocene∩europium assembly showing phototriggered anticancer activity and fluorescent modality imaging. Dalton Trans 2018; 47:1479-1487. [PMID: 29309070 DOI: 10.1039/c7dt04492e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Two macrocyclic ferrocenophanes containing a coumarin fluorophore, Se2N[7]ferrocenophane (fc1), and Se4N2[7,7]ferrocenophane (fc2), construct an assembly of fc1-H+ClO4[Eu(C10H21COO)2(H2O)2(ClO4)] (fc1∩Eu) and fc2-2H+{ClO4[Eu(C10H21COO)2(H2O)2(ClO4)]}2 (fc2∩Eu) via a N-HO hydrogen bond and a coordinate bond between EuIII and ClO4-. In fc1∩Eu, UV light irradiation triggers non-covalent bond cleavage to release a ferrocenium and EuII complex, accompanying chromism and luminescence signals. Investigations through the steady-state UV-vis absorption, fluorescence, time-resolved fluorescence, femtosecond transient absorption spectra and electrochemical characterization elucidate a stepwise mechanism: firstly, an effective electron transfer occurs from a ferrocene unit to the singlet state of a coumarin unit; the following proton-coupled electron transfer (PCET) reduces EuIII and results in a non-covalent interaction cleavage. Further in vitro exploration of fc1∩Eu in HepG2 cells demonstrated phototriggered integrated cell cytotoxicity and fluorescent modality imaging.
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Affiliation(s)
- Jian Qu
- Institute of Advanced Materials, Nanjing Tech University, Nanjing 210009, P.R. China.
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30
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Llancalahuen FM, Fuentes JA, Carreño A, Zúñiga C, Páez-Hernández D, Gacitúa M, Polanco R, Preite MD, Arratia-Pérez R, Otero C. New Properties of a Bioinspired Pyridine Benzimidazole Compound as a Novel Differential Staining Agent for Endoplasmic Reticulum and Golgi Apparatus in Fluorescence Live Cell Imaging. Front Chem 2018; 6:345. [PMID: 30211148 PMCID: PMC6123694 DOI: 10.3389/fchem.2018.00345] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 07/23/2018] [Indexed: 12/16/2022] Open
Abstract
In this study, we explored new properties of the bioinspired pyridine benzimidazole compound B2 (2,4-di-tert-butyl-6-(3H-imidazo[4,5-c]pyridine-2-yl)phenol) regarding its potential use as a differential biomarker. For that, we performed 1D 1HNMR (TOCSY), UV-Vis absorption spectra in different organic solvents, voltammetry profile (including a scan-rate study), and TD-DFT calculations that including NBO analyses, to provide valuable information about B2 structure and luminescence. In our study, we found that the B2 structure is highly stable, where the presence of an intramolecular hydrogen bond (IHB) seems to have a crucial role in the stability of luminescence, and its emission can be assigned as fluorescence. In fact, we found that the relatively large Stokes Shift observed for B2 (around 175 nm) may be attributed to the stability of the B2 geometry and the strength of its IHB. On the other hand, we determined that B2 is biocompatible by cytotoxicity experiments in HeLa cells, an epithelial cell line. Furthermore, in cellular assays we found that B2 could be internalized by passive diffusion in absence of artificial permeabilization at short incubation times (15 min to 30 min). Fluorescence microscopy studies confirmed that B2 accumulates in the endoplasmic reticulum (ER) and Golgi apparatus, two organelles involved in the secretory pathway. Finally, we determined that B2 exhibited no noticeable blinking or bleaching after 1 h of continuous exposure. Thus, B2 provides a biocompatible, rapid, simple, and efficient way to fluorescently label particular organelles, producing similar results to that obtained with other well-established but more complex methods.
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Affiliation(s)
- Felipe M Llancalahuen
- Escuela de Química y Farmacia, Facultad de Medicina, Universidad Andres Bello, Santiago, Chile
| | - Juan A Fuentes
- Laboratorio de Patogénesis y Genética Bacteriana, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Alexander Carreño
- Center of Applied Nanosciences, Universidad Andres Bello, Santiago, Chile.,Fondo Nacional de Ciencia y Tecnología (FONDECYT), Santiago, Chile
| | - César Zúñiga
- Center of Applied Nanosciences, Universidad Andres Bello, Santiago, Chile
| | | | | | - Rubén Polanco
- Centro de Biotecnología Vegeta, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Marcelo D Preite
- Departamento de Química Orgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Santiago, Chile
| | | | - Carolina Otero
- Escuela de Química y Farmacia, Facultad de Medicina, Universidad Andres Bello, Santiago, Chile
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31
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Eberhart MS, Bowers LMR, Shan B, Troian-Gautier L, Brennaman MK, Papanikolas JM, Meyer TJ. Completing a Charge Transport Chain for Artificial Photosynthesis. J Am Chem Soc 2018; 140:9823-9826. [DOI: 10.1021/jacs.8b06740] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael S. Eberhart
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, North Carolina 27599, United States
| | - Leah M. Rader Bowers
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, North Carolina 27599, United States
| | - Bing Shan
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, North Carolina 27599, United States
| | - Ludovic Troian-Gautier
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, North Carolina 27599, United States
| | - M. Kyle Brennaman
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, North Carolina 27599, United States
| | - John M. Papanikolas
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, North Carolina 27599, United States
| | - Thomas J. Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, North Carolina 27599, United States
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32
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Khade RV, Dutta Choudhury S, Pal H, Kumbhar AS. Excited State Interaction of Ruthenium (II) Imidazole Phenanthroline Complex [Ru(bpy) 2 ipH] 2+ with 1,4-Benzoquinone: Simple Electron Transfer or Proton-Coupled Electron Transfer? Chemphyschem 2018; 19:2380-2388. [PMID: 29873437 DOI: 10.1002/cphc.201800313] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Indexed: 11/07/2022]
Abstract
The unidirectional proton coupled electron transfer (PCET) from the excited state of Ru(II) imidazole phenanthroline complex [Ru(bpy)2 ipH]2+ to 1,4-benzoquinone, was studied by steady-state (SS) and time-resolved (TR) fluorescence and transient absorption (TA) measurements. The pKa (9.7) and pKa * (8.6) values of the complex suggest that it behaves as a photoacid on excitation. The difference in the quenching rates obtained from SS and TR fluorescence studies indicate participation of both dynamic quenching and static quenching involving the hydrogen bonded ipH ligand of [Ru(bpy)2 ipH]2+ with the 1,4-benzoquinone quencher, formed in the ground state. Within the hydrogen bonded complex, the ruthenium centre acts as the electron donor, while the ipH ligand acts as the proton donor to the hydrogen bonded 1,4-benzoquinone that acts simultaneously both as the electron and proton acceptor. It is proposed that the static quenching in the hydrogen bonded [Ru(bpy)2 ipH]2+ -1,4-benzoquinone pairs occurs involving the PCET mechanism, while the dynamic quenching occurs through the simple ET mechanism, on diffusional encounter of the isolated 1,4-benzoquinone with the excited [Ru(bpy)2 ipH]2+ complex. The occurrence of broad TA bands around 420-430 nm suggests formation of both 1,4-benzoquinone radical anion as well as the 1,4-benzosemiquinone radical by the interaction of excited [Ru(bpy)2 ipH]2+ with 1,4-benzoquinone, thus supporting the ET process in the studied system.
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Affiliation(s)
- Rahul V Khade
- Department of Chemistry, Savitribai Phule Pune University, Pune, 411007, India
| | | | - Haridas Pal
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Avinash S Kumbhar
- Department of Chemistry, Savitribai Phule Pune University, Pune, 411007, India
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33
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Bowring MA, Bradshaw LR, Parada GA, Pollock TP, Fernández-Terán RJ, Kolmar SS, Mercado BQ, Schlenker CW, Gamelin DR, Mayer JM. Activationless Multiple-Site Concerted Proton-Electron Tunneling. J Am Chem Soc 2018; 140:7449-7452. [PMID: 29847111 PMCID: PMC6310214 DOI: 10.1021/jacs.8b04455] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The transfer of protons and electrons is key to energy conversion and storage, from photosynthesis to fuel cells. Increased understanding and control of these processes are needed. A new anthracene-phenol-pyridine molecular triad was designed to undergo fast photoinduced multiple-site concerted proton-electron transfer (MS-CPET), with the phenol moiety transferring an electron to the photoexcited anthracene and a proton to the pyridine. Fluorescence quenching and transient absorption experiments in solutions and glasses show rapid MS-CPET (3.2 × 1010 s-1 at 298 K). From 5.5 to 90 K, the reaction rate and kinetic isotope effect (KIE) are independent of temperature, with zero Arrhenius activation energy. From 145 to 350 K, there are only slight changes with temperature. This MS-CPET reaction thus occurs by tunneling of both the proton and electron, in different directions. Since the reaction proceeds without significant thermal activation energy, the rate constant indicates the magnitude of the electron/proton double tunneling probability.
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Affiliation(s)
- Miriam A. Bowring
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
- Department of Chemistry, Reed College, Portland, Oregon 97202, United States
| | - Liam R. Bradshaw
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Giovanny A. Parada
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Timothy P. Pollock
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | | | - Scott S. Kolmar
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Brandon Q. Mercado
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Cody W. Schlenker
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Daniel R. Gamelin
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - James M. Mayer
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
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34
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Chararalambidis G, Das S, Trapali A, Quaranta A, Orio M, Halime Z, Fertey P, Guillot R, Coutsolelos A, Leibl W, Aukauloo A, Sircoglou M. Water Molecules Gating a Photoinduced One-Electron Two-Protons Transfer in a Tyrosine/Histidine (Tyr/His) Model of Photosystem II. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201804498] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Georgios Chararalambidis
- Laboratory of Bioinorganic Chemistry; Chemistry Department; University of Crete; PO Box 2208 71003 Heraklion Crete Greece
| | - Shyamal Das
- Institut des Sciences du vivant Frédéric Joliot/Institut de Biologie Intégrative de la Cellule, UMR 9198; CEA; CNRS; Université Paris Sud; Université Paris-Saclay; 91191 Gif-sur-Yvette France
| | - Adelais Trapali
- Laboratory of Bioinorganic Chemistry; Chemistry Department; University of Crete; PO Box 2208 71003 Heraklion Crete Greece
| | - Annamaria Quaranta
- Institut des Sciences du vivant Frédéric Joliot/Institut de Biologie Intégrative de la Cellule, UMR 9198; CEA; CNRS; Université Paris Sud; Université Paris-Saclay; 91191 Gif-sur-Yvette France
| | - Maylis Orio
- Aix Marseille Univ; iSm2; CNRS; Cent Marseille; 13397 Marseille France
| | - Zakaria Halime
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS; Université Paris Sud; Université Paris-Saclay; 91405 Orsay France
| | - Pierre Fertey
- Synchrotron SOLEIL; BP 48, L'Orme des Merisiers, Saint Aubin 91192 Gif-sur-Yvette Cedex France
| | - Régis Guillot
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS; Université Paris Sud; Université Paris-Saclay; 91405 Orsay France
| | - Athanassios Coutsolelos
- Laboratory of Bioinorganic Chemistry; Chemistry Department; University of Crete; PO Box 2208 71003 Heraklion Crete Greece
| | - Winfried Leibl
- Institut des Sciences du vivant Frédéric Joliot/Institut de Biologie Intégrative de la Cellule, UMR 9198; CEA; CNRS; Université Paris Sud; Université Paris-Saclay; 91191 Gif-sur-Yvette France
| | - Ally Aukauloo
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS; Université Paris Sud; Université Paris-Saclay; 91405 Orsay France
- Institut des Sciences du vivant Frédéric Joliot/Institut de Biologie Intégrative de la Cellule, UMR 9198; CEA; CNRS; Université Paris Sud; Université Paris-Saclay; 91191 Gif-sur-Yvette France
| | - Marie Sircoglou
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS; Université Paris Sud; Université Paris-Saclay; 91405 Orsay France
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35
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Chararalambidis G, Das S, Trapali A, Quaranta A, Orio M, Halime Z, Fertey P, Guillot R, Coutsolelos A, Leibl W, Aukauloo A, Sircoglou M. Water Molecules Gating a Photoinduced One-Electron Two-Protons Transfer in a Tyrosine/Histidine (Tyr/His) Model of Photosystem II. Angew Chem Int Ed Engl 2018; 57:9013-9017. [DOI: 10.1002/anie.201804498] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Georgios Chararalambidis
- Laboratory of Bioinorganic Chemistry; Chemistry Department; University of Crete; PO Box 2208 71003 Heraklion Crete Greece
| | - Shyamal Das
- Institut des Sciences du vivant Frédéric Joliot/Institut de Biologie Intégrative de la Cellule, UMR 9198; CEA; CNRS; Université Paris Sud; Université Paris-Saclay; 91191 Gif-sur-Yvette France
| | - Adelais Trapali
- Laboratory of Bioinorganic Chemistry; Chemistry Department; University of Crete; PO Box 2208 71003 Heraklion Crete Greece
| | - Annamaria Quaranta
- Institut des Sciences du vivant Frédéric Joliot/Institut de Biologie Intégrative de la Cellule, UMR 9198; CEA; CNRS; Université Paris Sud; Université Paris-Saclay; 91191 Gif-sur-Yvette France
| | - Maylis Orio
- Aix Marseille Univ; iSm2; CNRS; Cent Marseille; 13397 Marseille France
| | - Zakaria Halime
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS; Université Paris Sud; Université Paris-Saclay; 91405 Orsay France
| | - Pierre Fertey
- Synchrotron SOLEIL; BP 48, L'Orme des Merisiers, Saint Aubin 91192 Gif-sur-Yvette Cedex France
| | - Régis Guillot
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS; Université Paris Sud; Université Paris-Saclay; 91405 Orsay France
| | - Athanassios Coutsolelos
- Laboratory of Bioinorganic Chemistry; Chemistry Department; University of Crete; PO Box 2208 71003 Heraklion Crete Greece
| | - Winfried Leibl
- Institut des Sciences du vivant Frédéric Joliot/Institut de Biologie Intégrative de la Cellule, UMR 9198; CEA; CNRS; Université Paris Sud; Université Paris-Saclay; 91191 Gif-sur-Yvette France
| | - Ally Aukauloo
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS; Université Paris Sud; Université Paris-Saclay; 91405 Orsay France
- Institut des Sciences du vivant Frédéric Joliot/Institut de Biologie Intégrative de la Cellule, UMR 9198; CEA; CNRS; Université Paris Sud; Université Paris-Saclay; 91191 Gif-sur-Yvette France
| | - Marie Sircoglou
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS; Université Paris Sud; Université Paris-Saclay; 91405 Orsay France
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36
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Gaynor JD, Khalil M. Signatures of vibronic coupling in two-dimensional electronic-vibrational and vibrational-electronic spectroscopies. J Chem Phys 2018; 147:094202. [PMID: 28886647 DOI: 10.1063/1.4991745] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Two-Dimensional Electronic-Vibrational (2D EV) spectroscopy and Two-Dimensional Vibrational-Electronic (2D VE) spectroscopy are new coherent four-wave mixing spectroscopies that utilize both electronically resonant and vibrationally resonant field-matter interactions to elucidate couplings between electronic and vibrational degrees of freedom. A system Hamiltonian is developed here to lay a foundation for interpreting the 2D EV and 2D VE signals that arise from a vibronically coupled molecular system in the condensed phase. A molecular system consisting of one anharmonic vibration and two electronic states is modeled. Equilibrium displacement of the vibrational coordinate and vibrational frequency shifts upon excitation to the first electronic excited state are included in our Hamiltonian through linear and quadratic vibronic coupling terms. We explicitly consider the nuclear dependence of the electronic transition dipole moment and demonstrate that these spectroscopies are sensitive to non-Condon effects. A series of simulations of 2D EV and 2D VE spectra obtained by varying parameters of the system, system-bath, and interaction Hamiltonians demonstrate that one of the following conditions must be met to observe signals: (1) non-zero linear and/or quadratic vibronic coupling in the electronic excited state, (2) vibrational-coordinate dependence of the electronic transition dipole moment, or (3) electronic-state-dependent vibrational dephasing dynamics. We explore how these vibronic interactions are manifested in the positions, amplitudes, and line shapes of the peaks in 2D EV and 2D VE spectroscopies.
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Affiliation(s)
- James D Gaynor
- Department of Chemistry, University of Washington, P.O. Box 351700, Seattle, Washington 98195, USA
| | - Munira Khalil
- Department of Chemistry, University of Washington, P.O. Box 351700, Seattle, Washington 98195, USA
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37
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Thiyagarajan SK, Suresh R, Ramanan V, Ramamurthy P. Deciphering the incognito role of water in a light driven proton coupled electron transfer process. Chem Sci 2018; 9:910-921. [PMID: 29629158 PMCID: PMC5873145 DOI: 10.1039/c7sc03161k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 11/10/2017] [Indexed: 01/26/2023] Open
Abstract
Light induced multisite electron proton transfer in two different phenol (simple and phenol carrying an intramolecularly hydrogen bonded base) pendants on acridinedione dye (ADD) and an NADH analogue was studied by following fluorescence quenching dynamics in an ultrafast timescale. In a simple phenol derivative (ADDOH), photo-excited acridinedione acquires an electron from phenol intramolecularly, coupled with the transfer of a proton to solvent water. But in a phenol carrying hydrogen bonded base (ADDDP), both electron and proton transfer occur completely intramolecularly. The sequence of this electron and proton transfer process was validated by discerning the pH dependency of the reaction kinetics. Since photo-excited ADDs are stronger oxidants, the sequential electron first proton transfer mechanism (ETPT) was observed in ADDOH and hence there is no change in the PCET reaction kinetics kETPT ∼ 6.57 × 109 s-1 in the entire pH range (pH 2-12). But the phenol carrying hydrogen bonded base (ADDDP) unleashes concerted electron proton transfer where the PCET reaction rate decreases upon decreasing the pH below its pKa. Noticeably, the concerted EPT process in ADDDP mimics the donor side of photosystem II and it occurs by two distinct pathways: (i) through direct intramolecular hydrogen bonding between the phenol and amine, kDEPT ∼ 12.5 × 1010 s-1 and (ii) through the bidirectional hydrogen bond extended by the water molecule trapped in between the proton donor and acceptor, which mediates the proton transfer and serves as a proton wire, kWMEPT ∼ 2.85 × 1010 s-1. These results unravel the incognito role played by water in mediating the proton transfer process when the structural elements do not favor direct hydrogen bonding between the proton donor and acceptor in a concerted PCET reaction.
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Affiliation(s)
- Senthil Kumar Thiyagarajan
- National Centre for Ultrafast Processes , University of Madras , Taramani Campus , Chennai - 600 113 , India .
| | - Raghupathy Suresh
- National Centre for Ultrafast Processes , University of Madras , Taramani Campus , Chennai - 600 113 , India .
| | - Vadivel Ramanan
- National Centre for Ultrafast Processes , University of Madras , Taramani Campus , Chennai - 600 113 , India .
| | - Perumal Ramamurthy
- National Centre for Ultrafast Processes , University of Madras , Taramani Campus , Chennai - 600 113 , India .
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38
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Weissman A, Amir D, Elias Y, Pinkas I, Mathias JL, Benisvy L, Salomon A. Bio-inspired Photocatalytic Ruthenium Complexes: Synthesis, Optical Properties, and Solvatochromic Effect. Chemphyschem 2018; 19:220-226. [PMID: 29194896 DOI: 10.1002/cphc.201701061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 11/27/2017] [Indexed: 11/11/2022]
Abstract
We report the synthesis, characterization, and photo-physical properties of two new rutheniumII -phenol-imidazole complexes. These bio-mimetic complexes have potential as photocatalysts for water splitting. Owing to their multiple phenol-imidazole groups, they have a higher probability of light-induced radical formation than existing complexes. The newly synthesized complexes show improved overlap with the solar spectrum compared to other rutheniumII -phenol-imidazole complexes, and their measured lifetimes are suitable for light-induced radical formation. In addition, we conducted solvatochromic absorption measurements, which elegantly follow Marcus theory, and demonstrate the symmetry differences between the two complexes. The solvatochromic measurements further imply electron localization onto one of the ligands. The new complexes may find applications in photocatalysis, dye-sensitized solar cells, biomedicine, and sensing. Moreover, their multiple chelating units make them promising candidates for light-activated metal organic radical frameworks, i.e. metal-organic frameworks that contain organic radicals activated by light.
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Affiliation(s)
- Adam Weissman
- Department of Chemistry, Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Dan Amir
- Department of Life Sciences, Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Yuval Elias
- Department of Chemistry, Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Iddo Pinkas
- Faculty of Chemistry, Weizmann Institute of Science, Rehovot, 7610001, Israel
| | - Jenny-Lee Mathias
- Department of Chemistry, Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Laurent Benisvy
- Department of Chemistry, Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Adi Salomon
- Department of Chemistry, Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan, 5290002, Israel
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39
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Shao JY, Zhong YW. pH value-dependent electronic absorption and Ru(III/II) potential of bis-tridentate pincer ruthenium complexes. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.04.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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40
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Uraguchi D, Torii M, Ooi T. Acridinium Betaine as a Single-Electron-Transfer Catalyst: Design and Application to Dimerization of Oxindoles. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00265] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daisuke Uraguchi
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied
Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Masahiro Torii
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied
Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Takashi Ooi
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied
Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
- CREST,
Japan Science and Technology Agency (JST), Nagoya University, Nagoya 464-8601, Japan
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41
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Glover SD, Parada GA, Markle TF, Ott S, Hammarström L. Isolating the Effects of the Proton Tunneling Distance on Proton-Coupled Electron Transfer in a Series of Homologous Tyrosine-Base Model Compounds. J Am Chem Soc 2017; 139:2090-2101. [DOI: 10.1021/jacs.6b12531] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Starla D. Glover
- Department of Chemistry−Ångström, Uppsala University, Box
532, SE-751 20, Uppsala, Sweden
| | - Giovanny A. Parada
- Department of Chemistry−Ångström, Uppsala University, Box
532, SE-751 20, Uppsala, Sweden
| | - Todd F. Markle
- Department of Chemistry−Ångström, Uppsala University, Box
532, SE-751 20, Uppsala, Sweden
| | - Sascha Ott
- Department of Chemistry−Ångström, Uppsala University, Box
532, SE-751 20, Uppsala, Sweden
| | - Leif Hammarström
- Department of Chemistry−Ångström, Uppsala University, Box
532, SE-751 20, Uppsala, Sweden
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42
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Pannwitz A, Prescimone A, Wenger OS. Ruthenium(II)-Pyridylimidazole Complexes as Photoreductants and PCET Reagents. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201601403] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Andrea Pannwitz
- Department of Chemistry; University of Basel; St. Johanns-Ring 19 and Spitalstrasse 51 4056 Basel Switzerland
| | - Alessandro Prescimone
- Department of Chemistry; University of Basel; St. Johanns-Ring 19 and Spitalstrasse 51 4056 Basel Switzerland
| | - Oliver S. Wenger
- Department of Chemistry; University of Basel; St. Johanns-Ring 19 and Spitalstrasse 51 4056 Basel Switzerland
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43
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Materna KL, Crabtree RH, Brudvig GW. Anchoring groups for photocatalytic water oxidation on metal oxide surfaces. Chem Soc Rev 2017. [DOI: 10.1039/c7cs00314e] [Citation(s) in RCA: 153] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The synthesis, binding modes, water stability, and electron-transfer dynamics are compared for carboxylate, phosphonate, hydroxamate, and silatrane anchoring groups.
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Affiliation(s)
- Kelly L. Materna
- Department of Chemistry
- Yale University
- New Haven
- USA
- Yale Energy Sciences Institute
| | - Robert H. Crabtree
- Department of Chemistry
- Yale University
- New Haven
- USA
- Yale Energy Sciences Institute
| | - Gary W. Brudvig
- Department of Chemistry
- Yale University
- New Haven
- USA
- Yale Energy Sciences Institute
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44
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Kanti Seth S, Gupta P, Purkayastha P. Efficiency of photoinduced electron transfer in mono- and di-nuclear iridium complexes: a comparative study. NEW J CHEM 2017. [DOI: 10.1039/c7nj01423f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoinduced electron transfer in mono- and dinuclear Ir(iii) complexes is dominated by the mononuclear as compared to the dinuclear complex.
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Affiliation(s)
- Sourav Kanti Seth
- Department of Chemical Sciences
- Indian Institute of Science Education and Research (IISER) Kolkata
- Mohanpur 741246
- India
| | - Parna Gupta
- Department of Chemical Sciences
- Indian Institute of Science Education and Research (IISER) Kolkata
- Mohanpur 741246
- India
| | - Pradipta Purkayastha
- Department of Chemical Sciences
- Indian Institute of Science Education and Research (IISER) Kolkata
- Mohanpur 741246
- India
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