1
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Gupta R, Negi A, Pal AK. A Bichromophoric Approach to Induce Luminescence - A Blend of Experimental and Theoretical Studies. Chem Asian J 2024; 19:e202400270. [PMID: 38742860 DOI: 10.1002/asia.202400270] [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: 03/09/2024] [Revised: 05/11/2024] [Accepted: 05/14/2024] [Indexed: 05/16/2024]
Abstract
Two homoleptic terpyridyl complexes of Ru(II), 1 and Fe(II), 2 were synthesized using a ligand L1 that contained a phenyl spacer between an anthracenyl (An) and a terpyridyl (tpy) moiety. An equilibrated-bichromophoric strategy was adopted to induce photoluminescence in 1 and 2. A glimpse into the excited state photophysical properties of 1 and 2 revealed that 1 exhibited NIR emission at ~700 nm with an excited state lifetime components of 1.33 and 6.52 ns. On the other hand, 2 was found to be non-luminescent. The origin of emission in case of 1 was attributed to the effect of phenyl spacer which rendered the 3An state to be nearly isoenergetic to the emissive 3MLCT state of 1 facilitating 3MLCT-3An equilibrium. This fact was supported by experimental (photocurrent generation) and theoretical (potential energy diagram) evidences.
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Affiliation(s)
- Rahat Gupta
- Department of Chemistry, Indian Institute of Technology Jammu, Nagrota Bypass Road, Jammu and Kashmir, 181221, India
| | - Anshul Negi
- Department of Chemistry, Indian Institute of Technology Jammu, Nagrota Bypass Road, Jammu and Kashmir, 181221, India
| | - Amlan K Pal
- Department of Chemistry, Indian Institute of Technology Jammu, Nagrota Bypass Road, Jammu and Kashmir, 181221, India
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2
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Singh A, Singh B, Dey S, Indra A, Lahiri GK. Ruthenium Azobis(benzothiazole): Electronic Structure and Impact of Substituents on the Electrocatalytic Single-Site Water Oxidation Process. Inorg Chem 2023; 62:2769-2783. [PMID: 36719385 DOI: 10.1021/acs.inorgchem.2c03906] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The present article deals with the structurally and spectroelectrochemically characterized newer class of ruthenium-azoheteroarenes [RuII(Ph-trpy)(Cl)(L)]ClO4, [1]ClO4-[3]ClO4 (Ph-trpy: 4'-phenyl-2,2':6',2″-terpyridine; L1: 2,2'-azobis(benzothiazole) ([1]ClO4); L2: 2,2'-azobis(6-methylbenzothiazole) ([2]ClO4); L3: 2,2'-azobis(6-chlorobenzothiazole) ([3]ClO4)). A collective consideration of experimental (i.e., structural and spectroelectrochemical) and theoretical (DFT calculations) results of [1]ClO4-[3]ClO4 established selective stabilization of (i) the unperturbed azo (N═N)0 function of L, (ii) the exclusive presence of the isomeric form involving the N(azo) donor of L trans to Cl, and (iii) the presence of extended, hydrogen-bonded trimeric units in the asymmetric unit of [2]ClO4 (CH---O) via the involvement of ClO4- anions. The detailed electrochemical studies revealed metal-based oxidation of [RuII(Ph-trpy)(Cl)(L)]+ (1+-3+) to [RuIII(Ph-trpy)(Cl)(L)]2+ (12+-32+); however, the electronic form of the first reduced state (1-3) could be better represented by its mixed RuII(Ph-trpy)(Cl)(L•-)/RuIII(Ph-trpy)(Cl)(L2-) state. Both native (1+-3+) and reduced (1-3) states exhibited weak lower energy transitions within the range of 1000-1200 nm. Further, [1]ClO4-[3]ClO4 delivered an electrochemical OER (oxygen evolution reaction) process in alkaline medium on immobilizing them to a carbon cloth support, which divulged an amplified water oxidation feature for [2]ClO4 due to the presence of electron-donating methyl groups in the L2 backbone. The faster OER kinetics and high catalytic stability of [2]ClO4 could also be rationalized by its lowest Tafel slope (85 mV dec-1) and choronoamperometric experiment (stable up to 12 h), respectively, along with high Faradic efficiency (∼97%). A comparison of [2]ClO4 with the reported analogous ruthenium complexes furnished its excellent intrinsic water oxidation activity.
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Affiliation(s)
- Aditi Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Baghendra Singh
- Department of Chemistry, Indian Institute of Technology (BHU), Varanasi, Uttar Pradesh 221005, India
| | - Sanchaita Dey
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Arindam Indra
- Department of Chemistry, Indian Institute of Technology (BHU), Varanasi, Uttar Pradesh 221005, India
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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3
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East NR, Förster C, Carrella LM, Rentschler E, Heinze K. The Full d 3-d 5 Redox Series of Mononuclear Manganese Complexes: Geometries and Electronic Structures of [Mn(dgpy) 2] n. Inorg Chem 2022; 61:14616-14625. [PMID: 36070611 DOI: 10.1021/acs.inorgchem.2c01680] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Although manganese ions exhibit a rich redox chemistry, redox processes are often accompanied by structural reorganization and a high propensity for ligand substitution, so that no complete structurally characterized manganese(II,III,IV) complex series without significant ligand sphere reorganization akin to the manganese(II,III,IV) oxides exists. We present here the series of pseudo-octahedral homoleptic manganese complexes [Mn(dgpy)2]n+ (n = 2-4) with the adaptable tridentate push-pull ligand 2,6-diguanidylpyridine (dgpy). Mn-N bond lengths and N-Mn-N bond angles change characteristically from n = 2 to n = 4, while the overall [MnN6] coordination sphere is preserved. The manganese(III) complex [Mn(dgpy)2]3+ exhibits a Jahn-Teller elongated octahedron and a negative D = -3.84 cm-1. Concomitantly with the consecutive oxidation of [Mn(dgpy)2]2+ to [Mn(dgpy)2]4+, the optical properties evolve with increasing ligand-to-metal charge transfer character of the absorption bands culminating in the panchromatic absorption of the purple-black manganese(IV) complex [Mn(dgpy)2]4+.
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Affiliation(s)
- Nathan R East
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Christoph Förster
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Luca M Carrella
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Eva Rentschler
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Katja Heinze
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
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4
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Moll J, Förster C, König A, Carrella LM, Wagner M, Panthöfer M, Möller A, Rentschler E, Heinze K. Panchromatic Absorption and Oxidation of an Iron(II) Spin Crossover Complex. Inorg Chem 2022; 61:1659-1671. [PMID: 35020386 DOI: 10.1021/acs.inorgchem.1c03511] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In order to expand and exploit the useful properties of d6-iron(II) and d5-iron(III) complexes in potential magnetic, photophysical, or magnetooptical applications, crucial ligand-controlled parameters are the ligand field strength in a given coordination mode and the availability of suitable metal and ligand frontier orbitals for charge-transfer processes. The push-pull ligand 2,6-diguanidylpyridine (dgpy) features low-energy π* orbitals at the pyridine site and strongly electron-donating guanidinyl donors combined with the ability to form six-membered chelate rings for optimal metal-ligand orbital overlap. The electronic ground states of the pseudo-octahedral d6- and d5-complexes mer-[Fe(dgpy)2]2+, cis-fac-[Fe(dgpy)2]2+, and mer-[Fe(dgpy)2]3+ as well as their charge-transfer (CT) and metal-centered (MC) excited states are probed by variable temperature UV/vis absorption, NMR, EPR, and Mössbauer spectroscopy, magnetic susceptibility measurements at variable temperature as well as quantum chemical calculations.
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Affiliation(s)
- Johannes Moll
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Christoph Förster
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Alexandra König
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Luca M Carrella
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Manfred Wagner
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Martin Panthöfer
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Angela Möller
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Eva Rentschler
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Katja Heinze
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
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5
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Rupp MT, Shevchenko N, Hanan GS, Kurth DG. Enhancing the photophysical properties of Ru(II) complexes by specific design of tridentate ligands. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214127] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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6
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Rupp M, Auvray T, Rousset E, Mercier GM, Marvaud V, Kurth DG, Hanan GS. Photocatalytic Hydrogen Evolution Driven by a Heteroleptic Ruthenium(II) Bis(terpyridine) Complex. Inorg Chem 2019; 58:9127-9134. [PMID: 31247814 DOI: 10.1021/acs.inorgchem.9b00698] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Since the initial report by Lehn et al. in 1979, ruthenium tris(bipyridine) ([Ru(bpy)3]2+) and its numerous derivatives were applied as photosensitizers (PSs) in a large panel of photocatalytic conditions while the bis(terpyridine) analogues were disregarded because of their low quantum yields and short excited-state lifetimes. In this study, we prepared a new terpyridine ligand, 4'-(4-bromophenyl)-4,4‴:4″,4‴'-dipyridinyl- 2,2':6',2″-terpyridine (Bipytpy) and used it to prepare the heteroleptic complex [Ru(Tolyltpy)(Bipytpy)](PF6)2 (1; Tolyltpy = 4'-tolyl-2,2':6',2'-terpyridine). Complex 1 exhibits enhanced photophysical properties with a higher quantum yield (7.4 × 10-4) and a longer excited-state lifetime (3.8 ns) compared to those of [Ru(Tolyltpy)2](PF6)2 (3 × 10-5 and 0.74 ns, respectively). These enhanced photophysical characteristics and the potential for PS-catalyst interaction through the peripheral pyridines led us to apply the complex for visible-light-driven hydrogen evolution. The photocatalytic system based on 1 as the PS, triethanolamine as a sacrificial donor, and cobaloxime as a catalyst exhibits sustained activity over more than 10 days under blue-light irradiation (light-emitting diode centered at 450 nm). A maximum turnover number of 764 was obtained after 12 days.
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Affiliation(s)
- Mira Rupp
- Lehrstuhl für Chemische Technologie der Materialsynthese , Julius-Maximilians-Universität Würzburg , Röntgenring 11 , D-97070 Würzburg , Germany.,Département de Chimie , Université de Montréal , Montréal H3C 3J7 , Québec Canada
| | - Thomas Auvray
- Département de Chimie , Université de Montréal , Montréal H3C 3J7 , Québec Canada
| | - Elodie Rousset
- Département de Chimie , Université de Montréal , Montréal H3C 3J7 , Québec Canada.,Institut Parisien de Chimie Moléculaire , Sorbonne Université, CNRS UMR 8232 , 4 place Jussieu , 75252 Paris Cedex 05 , France
| | - Gabriel M Mercier
- Département de Chimie , Université de Montréal , Montréal H3C 3J7 , Québec Canada
| | - Valérie Marvaud
- Institut Parisien de Chimie Moléculaire , Sorbonne Université, CNRS UMR 8232 , 4 place Jussieu , 75252 Paris Cedex 05 , France
| | - Dirk G Kurth
- Lehrstuhl für Chemische Technologie der Materialsynthese , Julius-Maximilians-Universität Würzburg , Röntgenring 11 , D-97070 Würzburg , Germany
| | - Garry S Hanan
- Département de Chimie , Université de Montréal , Montréal H3C 3J7 , Québec Canada
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7
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Abstract
Novel heteroleptic Ru(ii)-polypyridyl complexes were synthesised that exhibit panchromatic absorption up to 750 nm and 3MLCT NIR emission at λem > 830 nm.
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Affiliation(s)
- Amlan K. Pal
- Organic Semiconductor Centre
- School of Chemistry
- University of St Andrews
- St Andrews
- UK
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8
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Allen JE, Kassel WS, Piro NA. Synthesis, structures and characterization of complexes containing a 2,6-bis(guanidinyl)pyridine ligand on iron(II), cobalt(II), nickel(II), copper(I), copper(II) and zinc(II). Polyhedron 2018. [DOI: 10.1016/j.poly.2018.08.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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9
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Rana PJS, Singh P. Interaction of semiconducting TiO2 colloidal nanoparticles with Ruthenium bis(Terpyridine) complexes: Experimental and theoretical evidences. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.05.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Pal AK, Li C, Hanan GS, Zysman‐Colman E. Blue‐Emissive Cobalt(III) Complexes and Their Use in the Photocatalytic Trifluoromethylation of Polycyclic Aromatic Hydrocarbons. Angew Chem Int Ed Engl 2018; 57:8027-8031. [DOI: 10.1002/anie.201802532] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 04/09/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Amlan K. Pal
- Département de ChimieUniversité de Montréal Montréal Québec H3T 1J4 Canada
- Organic Semiconductor CenterEaStCHEM School of ChemistryUniversity of St Andrews St Andrews Fife KY16 9ST UK
| | - Chenfei Li
- Organic Semiconductor CenterEaStCHEM School of ChemistryUniversity of St Andrews St Andrews Fife KY16 9ST UK
| | - Garry S. Hanan
- Département de ChimieUniversité de Montréal Montréal Québec H3T 1J4 Canada
| | - Eli Zysman‐Colman
- Organic Semiconductor CenterEaStCHEM School of ChemistryUniversity of St Andrews St Andrews Fife KY16 9ST UK
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11
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Pal AK, Li C, Hanan GS, Zysman‐Colman E. Blue‐Emissive Cobalt(III) Complexes and Their Use in the Photocatalytic Trifluoromethylation of Polycyclic Aromatic Hydrocarbons. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201802532] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Amlan K. Pal
- Département de ChimieUniversité de Montréal Montréal Québec H3T 1J4 Canada
- Organic Semiconductor CenterEaStCHEM School of ChemistryUniversity of St Andrews St Andrews Fife KY16 9ST UK
| | - Chenfei Li
- Organic Semiconductor CenterEaStCHEM School of ChemistryUniversity of St Andrews St Andrews Fife KY16 9ST UK
| | - Garry S. Hanan
- Département de ChimieUniversité de Montréal Montréal Québec H3T 1J4 Canada
| | - Eli Zysman‐Colman
- Organic Semiconductor CenterEaStCHEM School of ChemistryUniversity of St Andrews St Andrews Fife KY16 9ST UK
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12
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Cerfontaine S, Marcélis L, Laramee-Milette B, Hanan GS, Loiseau F, De Winter J, Gerbaux P, Elias B. Converging Energy Transfer in Polynuclear Ru(II) Multiterpyridine Complexes: Significant Enhancement of Luminescent Properties. Inorg Chem 2018; 57:2639-2653. [DOI: 10.1021/acs.inorgchem.7b03040] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Simon Cerfontaine
- Institut de la Matière Condensée et des Nanosciences (IMCN) − Molécules, Solides et Réactivité (MOST), Université catholique de Louvain, Place Louis Pasteur 1, bte L4.01.02, B-1348 Louvain-la-Neuve, Belgium
| | - Lionel Marcélis
- Institut de la Matière Condensée et des Nanosciences (IMCN) − Molécules, Solides et Réactivité (MOST), Université catholique de Louvain, Place Louis Pasteur 1, bte L4.01.02, B-1348 Louvain-la-Neuve, Belgium
| | - Baptiste Laramee-Milette
- Département de Chimie, Université de Montréal 2900 Edouard-Montpetit, Montréal, Québec H3T-1J4, Canada
| | - Garry S. Hanan
- Département de Chimie, Université de Montréal 2900 Edouard-Montpetit, Montréal, Québec H3T-1J4, Canada
| | - Frédérique Loiseau
- Département de Chimie Moléculaire, Université Grenoble-Alpes, CNRS UMR 5250, BP53 38041 Grenoble, France
| | - Julien De Winter
- Organic Synthesis and Mass Spectrometry Laboratory, University of Mons − UMons, 23 Place du Parc, B-7000 Mons, Belgium
| | - Pascal Gerbaux
- Organic Synthesis and Mass Spectrometry Laboratory, University of Mons − UMons, 23 Place du Parc, B-7000 Mons, Belgium
| | - Benjamin Elias
- Institut de la Matière Condensée et des Nanosciences (IMCN) − Molécules, Solides et Réactivité (MOST), Université catholique de Louvain, Place Louis Pasteur 1, bte L4.01.02, B-1348 Louvain-la-Neuve, Belgium
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13
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Jacques A, Auvray T, Bevernaegie R, Loiseau F, Cibian M, Hanan GS, Kirsch-De Mesmaeker A, Elias B. Proton sensitive charge-transfer excited states in bis-terdentate cyclometalated Ir(III) complexes: Spectroscopic and theoretical investigation. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.10.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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Schott O, Pal AK, Chartrand D, Hanan GS. A Bisamide Ruthenium Polypyridyl Complex as a Robust and Efficient Photosensitizer for Hydrogen Production. CHEMSUSCHEM 2017; 10:4436-4441. [PMID: 28945951 DOI: 10.1002/cssc.201701543] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 09/21/2017] [Indexed: 06/07/2023]
Abstract
A photosensitizer based on a ruthenium complex of a bisamide-polypyridyl ligand gives rise to a large improvement in photocatalytic stability, rate of activity, and efficiency in photocatalytic H2 production compared to [Ru(bpy)3 ]2+ (bpy=2,2'-bpyridine). The bisamide ruthenium polypyridyl complex combined with a cobaltoxime-based photocatalyst was found to be highly efficient under blue-light (turnover number (TON)=7800) and green-light irradiation (TON=7200) whereas [Ru(bpy)3 ]2+ was significantly less effective with a TON of 2600 and 1100, respectively. The greatest improvement was under red-light-emitting diodes, with bisamide ruthenium polypyridyl complex and cobaltoxime exhibiting a TON of 4200 compared to [Ru(bpy)3 ]2+ and cobaltoxime at a TON of only 71.
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Affiliation(s)
- Olivier Schott
- Départment de Chimie, Université de Montréal, 2900 Edouard-Montpetit, Montréal, Québec, H3T-1J4, Canada
| | - Amlan K Pal
- Départment de Chimie, Université de Montréal, 2900 Edouard-Montpetit, Montréal, Québec, H3T-1J4, Canada
- Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St Andrews, St Andrews, Fife, KY16 9ST, United Kingdom
| | - Daniel Chartrand
- LAMP-Laboratoire d'Analyse pour les Molécules et Matériaux Photoactifs-Laboratory for the Analysis of Molecules' and Materials' Photoactivity, Université de Montréal, 5155 Chemin de la Rampe, Montréal, Québec, H3T 2B1, Canada
| | - Garry S Hanan
- Départment de Chimie, Université de Montréal, 2900 Edouard-Montpetit, Montréal, Québec, H3T-1J4, Canada
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15
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Benavides PA, Matias TA, Araki K. Unexpected lability of the [Ru III(phtpy)Cl 3] complex. Dalton Trans 2017; 46:15567-15572. [PMID: 29091091 DOI: 10.1039/c7dt03658b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Ruthenium(iii) complexes are known for their high stability and inertness. To the best of our knowledge, the only well-characterized example of a labile Ru(iii) complex is [RuIII(edta)(H2O)] as a consequence of an intramolecular hydrogen bonding leading to the formation of a large opening in the molecule front, thus changing the mechanism from dissociative to associative. Compelling experimental evidence is presented demonstrating that the [RuIII(phtpy)Cl3] complex is labile, also indicating that the Ru(iii)-phtpy bond is much weaker than expected, in contrast to the strongly π-back-bonding stabilized Ru(ii)-phtpy bond.
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Affiliation(s)
- Paola A Benavides
- Department of Chemistry, Institute of Chemistry, University of São Paulo, Av. Lineu Prestes 748, Butantã, São Paulo, SP 05508-000, Brazil.
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16
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Laramée-Milette B, Hanan GS. Going against the flow: Os(ii)-to-Ru(ii) energy transfer in rod-like polypyridyl chromophore. Chem Commun (Camb) 2017; 53:10496-10499. [PMID: 28787049 DOI: 10.1039/c7cc03541a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The judicious design of a unique mixed-metal Ru-Os molecular rod led to the first photoinduced energy transfer from osmium-to-ruthenium in a polypyridyl complex. The absorbed light is directed from the osmium metal center to the peripheral ruthenium moieties, where only the low energy luminescence from the heteroleptic ruthenium phen-hpp complex was observed.
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Affiliation(s)
- Baptiste Laramée-Milette
- Département de chimie, Université de Montréal, 5155 Ch. de la rampe, Pavillon J.-A. Bombardier, H3T2B1, Montréal, QC, Canada.
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17
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Wirelike dinuclear ruthenium(II)polyterpyridine complexes based on D–P–A architecture: Experimental and theoretical investigation. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.03.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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18
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Meng TT, Wang H, Zheng ZB, Wang KZ. pH-Switchable "Off-On-Off" Near-Infrared Luminescence Based on a Dinuclear Ruthenium(II) Complex. Inorg Chem 2017; 56:4775-4779. [PMID: 28387505 DOI: 10.1021/acs.inorgchem.7b00223] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The pH-switchable room-temperature near-infrared (NIR) phosphorescence emission based on ruthenium(II) polypyridyl complexes has been very rarely reported, even though it is very desirable for applications in sensing, switching, and logic molecular devices and bioimaging. Here we report a novel dinuclear ruthenium(II) complex in an aerated acetonitrile solution featuring a bright NIR emission centered at 760 nm with an absolute quantum yield of 1.03%, a large Stokes shift of 254 nm, and a long emission lifetime of 108.3 ± 0.4 ns. The complex in a Britton-Roberson buffer also exhibited pH-induced "off-on-off" NIR luminescent switches with a maximum intensity enhancement factor of 41 and one of the switching events occurring near the physiological pH range.
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Affiliation(s)
- Ting-Ting Meng
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University , Beijing 100875, P. R. China
| | - Hao Wang
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University , Beijing 100875, P. R. China
| | - Ze-Bao Zheng
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University , Beijing 100875, P. R. China
| | - Ke-Zhi Wang
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University , Beijing 100875, P. R. China
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19
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Norouzi-Arasi H, Pal AK, Nag S, Chartrand D, Hanan GS. Synthesis and photophysical properties of C 3-symmetric tris(pyridyl)truxene scaffolds of Ru(ii) and Re(i). Chem Commun (Camb) 2016; 52:12159-12162. [PMID: 27711311 DOI: 10.1039/c6cc06496e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Facial Ru(ii)- and Re(i)-complexes of a novel face-capping tris(pyridyl)truxene ligand were synthesised and characterised by various analytical techniques including single crystal XRD. The Ru(ii) complex exhibits unusual green phosphorescence with a long excited-state lifetime.
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Affiliation(s)
- Hassan Norouzi-Arasi
- Département de Chimie, Université de Montréal, Montréal, Québec H3T 1J4, Canada.
| | - Amlan K Pal
- Département de Chimie, Université de Montréal, Montréal, Québec H3T 1J4, Canada.
| | - Samik Nag
- Département de Chimie, Université de Montréal, Montréal, Québec H3T 1J4, Canada. and Department of Chemistry, Acharya Prafulla Chandra Roy Government College, Himachal Bihar, Matigara, Silguri-734010, West Bengal, India
| | - Daniel Chartrand
- Département de Chimie, Université de Montréal, Montréal, Québec H3T 1J4, Canada.
| | - Garry S Hanan
- Département de Chimie, Université de Montréal, Montréal, Québec H3T 1J4, Canada.
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20
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Schwamm RJ, Vianello R, Maršavelski A, García MÁ, Claramunt RM, Alkorta I, Saame J, Leito I, Fitchett CM, Edwards AJ, Coles MP. (15)N NMR Spectroscopy, X-ray and Neutron Diffraction, Quantum-Chemical Calculations, and UV/vis-Spectrophotometric Titrations as Complementary Techniques for the Analysis of Pyridine-Supported Bicyclic Guanidine Superbases. J Org Chem 2016; 81:7612-25. [PMID: 27494395 DOI: 10.1021/acs.joc.6b01330] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Pyridine substituted with one and two bicyclic guanidine groups has been studied as a potential source of superbases. 2-{hpp}C5H4N (I) and 2,6-{hpp}2C5H3N (II) (hppH = 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine) were protonated using [HNEt3][BPh4] to afford [I-H][BPh4] (1a), [II-H][BPh4] (2), and [II-H2][BPh4]2 (3). Solution-state (1)H and (15)N NMR spectroscopy shows a symmetrical cation in 2, indicating a facile proton-exchange process in solution. Solid-state (15)N NMR data differentiates between the two groups, indicating a mixed guanidine/guanidinium. X-ray diffraction data are consistent with protonation at the imine nitrogen, confirmed for 1a by single-crystal neutron diffraction. The crystal structure of 1a shows association of two [I-H](+) cations within a cage of [BPh4](-) anions. Computational analysis performed in the gas phase and in MeCN solution shows that the free energy barrier to transfer a proton between imino centers in [II-H](+) is 1 order of magnitude lower in MeCN than in the gas phase. The results provide evidence that linking hpp groups with the pyridyl group stabilizes the protonation center, thereby increasing the intrinsic basicity in the gas phase, while the bulk prevents efficient cation solvation, resulting in diminished pKa(MeCN) values. Spectrophotometrically measured pKa values are in excellent agreement with calculated values and confirm that I and II are superbases in solution.
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Affiliation(s)
- Ryan J Schwamm
- School of Chemical and Physical Sciences, Victoria University of Wellington , P.O. Box 600, Wellington 6012, New Zealand
| | - Robert Vianello
- Computational Organic Chemistry and Biochemistry Group, Ruder Bošković Institute , Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Aleksandra Maršavelski
- Computational Organic Chemistry and Biochemistry Group, Ruder Bošković Institute , Bijenička cesta 54, 10000 Zagreb, Croatia
| | - M Ángeles García
- Departamento de Química Orgánica y Bio-Orgánica, Facultad de Ciencias, UNED , Paseo Senda del Rey 9, 28040 Madrid, Spain
| | - Rosa M Claramunt
- Departamento de Química Orgánica y Bio-Orgánica, Facultad de Ciencias, UNED , Paseo Senda del Rey 9, 28040 Madrid, Spain
| | - Ibon Alkorta
- Instituto de Química Médica (IQM-CSIC) , Juan de la Cierva 3, 28006 Madrid, Spain
| | - Jaan Saame
- Institute of Chemistry, University of Tartu , 14a Ravila Street, 50411, Tartu, Estonia
| | - Ivo Leito
- Institute of Chemistry, University of Tartu , 14a Ravila Street, 50411, Tartu, Estonia
| | | | - Alison J Edwards
- Bragg Institute, Australian Nuclear Science and Technology Organization, Locked Bag 2001, Kirrawee DC, NSW 2234, Australia
| | - Martyn P Coles
- School of Chemical and Physical Sciences, Victoria University of Wellington , P.O. Box 600, Wellington 6012, New Zealand
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21
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Byrne A, Dolan C, Moriarty RD, Martin A, Neugebauer U, Forster RJ, Davies A, Volkov Y, Keyes TE. Osmium(II) polypyridyl polyarginine conjugate as a probe for live cell imaging; a comparison of uptake, localization and cytotoxicity with its ruthenium(II) analogue. Dalton Trans 2016. [PMID: 26197944 DOI: 10.1039/c5dt01833a] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A first investigation into the application of a luminescent osmium(ii) bipyridine complex to live cell imaging is presented. Osmium(ii) (bis-2,2-bipyridyl)-2(4-carboxylphenyl) imidazo[4,5f][1,10]phenanthroline was prepared and conjugated to octaarginine, a cell penetrating peptide. The photophysics, cell uptake and cytotoxicity of this osmium complex conjugate were performed and compared with its ruthenium analogue. Cell uptake and distribution of both ruthenium and osmium conjugates were very similar with rapid transmembrane transport of the osmium probe (complete within approx. 20 min) and dispersion throughout the cytoplasm and organelles. The near-infrared (NIR) emission of the osmium complex (λmax 726 nm) coincides well with the biological optical window and this facilitated luminescent and luminescence lifetime imaging of the cell which was well resolved from cell autofluorescence. The large Stokes shift of the emission also permitted resonance Raman mapping of the dye within CHO cells. Rather surprisingly, the osmium conjugate exhibited very low cytotoxicity when incubated both in the dark and under visible irradiation. This was attributed to the remarkable stability of this complex which was reflected by the complete absence of photo-bleaching of the complex even under extended continuous irradiation. In addition, when compared to its ruthenium analogue its luminescence was short-lived in water therefore rendering it insensitive to O2.
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Affiliation(s)
- Aisling Byrne
- School of Chemical Sciences, National Centre for Sensor Research, Dublin City University, Glasnevin, Dublin 9, Ireland.
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22
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Jacques A, Schott O, Robeyns K, Hanan GS, Elias B. Hydrogen Photoevolution from a Green-Absorbing Iridium(III)-Cobalt(III) Dyad. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501467] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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23
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Naik S, Kumar S, Mague JT, Balakrishna MS. A hybrid terpyridine-based bis(diphenylphosphino)amine ligand, terpy-C6H4N(PPh2)2: synthesis, coordination chemistry and photoluminescence studies. Dalton Trans 2016; 45:18434-18437. [DOI: 10.1039/c6dt03440c] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This paper describes the synthesis, metal complexes and photophysical studies of a novel hybrid ligand containing terpyridine and aminobis(phosphine) moieties.
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Affiliation(s)
- Susmita Naik
- Phosphorus Laboratory
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Saurabh Kumar
- Phosphorus Laboratory
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Joel T. Mague
- Department of Chemistry
- Tulane University
- New Orleans
- USA
| | - Maravanji S. Balakrishna
- Phosphorus Laboratory
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
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24
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Laramée-Milette B, Hanan GS. Ruthenium bistridentate complexes with non-symmetrical hexahydro-pyrimidopyrimidine ligands: a structural and theoretical investigation of their optical and electrochemical properties. Dalton Trans 2016; 45:12507-17. [DOI: 10.1039/c6dt02408d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The optical and electronic properties of six Ru complexes with non-symmetrical tridentate ligands have been investigated and, as corroborated by electrochemical data, the presence of the hpp ligand strongly affects the oxidation potential of the metal ion.
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Affiliation(s)
| | - Garry S. Hanan
- Département de Chimie
- Université de Montréal
- Montréal
- Canada
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25
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Bessette A, Auvray T, Désilets D, Hanan GS. Non-symmetric benzo[b]-fused BODIPYs as a versatile fluorophore platform reaching the NIR: a systematic study of the underlying structure–property relationship. Dalton Trans 2016; 45:7589-604. [DOI: 10.1039/c5dt04444h] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ten newly synthesized non-symmetric benzo[b]-fused BODIPYs are compared with an extended series of nine related families (23 compounds) to gain insights into their structure–property relationship.
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Affiliation(s)
- André Bessette
- Département de Chimie
- Université de Montréal
- Pavillon J.-A. Bombardier
- Montréal
- Canada
| | - Thomas Auvray
- Département de Chimie
- Université de Montréal
- Pavillon J.-A. Bombardier
- Montréal
- Canada
| | | | - Garry S. Hanan
- Département de Chimie
- Université de Montréal
- Pavillon J.-A. Bombardier
- Montréal
- Canada
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26
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Bessette A, Cibian M, Ferreira JG, DiMarco BN, Bélanger F, Désilets D, Meyer GJ, Hanan GS. Azadipyrromethene cyclometalation in neutral RuII complexes: photosensitizers with extended near-infrared absorption for solar energy conversion applications. Dalton Trans 2016; 45:10563-76. [DOI: 10.1039/c6dt00961a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
In the on-going quest to harvest near-infrared (NIR) photons for energy conversion applications, a novel family of neutral ruthenium(ii) sensitizers has been developed by cyclometalation of an azadipyrromethene chromophore.
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Affiliation(s)
- André Bessette
- Département de Chimie
- Université de Montréal
- Montréal
- Canada
- PCAS Canada Inc. (http://www.pcas.com)
| | - Mihaela Cibian
- Département de Chimie
- Université de Montréal
- Montréal
- Canada
| | | | - Brian N. DiMarco
- Departments of Chemistry and Materials Science & Engineering
- The University of North Carolina at Chapel Hill
- Chapel Hill
- USA
| | | | | | - Gerald J. Meyer
- Departments of Chemistry and Materials Science & Engineering
- The University of North Carolina at Chapel Hill
- Chapel Hill
- USA
| | - Garry S. Hanan
- Département de Chimie
- Université de Montréal
- Montréal
- Canada
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27
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Hasan K, Pal AK, Auvray T, Zysman-Colman E, Hanan GS. Blue-green emissive cationic iridium(iii) complexes using partially saturated strongly-donating guanidyl-pyridine/-pyrazine ancillary ligands. Chem Commun (Camb) 2015; 51:14060-3. [DOI: 10.1039/c5cc04069h] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A new class of cationic iridium(iii) complexes of the form [(C∧N)2Ir(N∧N)][PF6] is reported, where C∧N = cyclometallating 2-phenylpyridinato, ppy, or 2-(2,4-difluorophenyl)-5′-methylpyridinato, dFMeppy, and N∧N = guanidyl-pyridine, gpy, or -pyrazine, gpz, as the ancillary ligand.
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Affiliation(s)
- Kamrul Hasan
- Département de Chimie
- Université de Montréal
- Montréal
- Canada
| | - Amlan K. Pal
- Département de Chimie
- Université de Montréal
- Montréal
- Canada
| | - Thomas Auvray
- Département de Chimie
- Université de Montréal
- Montréal
- Canada
| | - Eli Zysman-Colman
- Organic Semiconductor Centre
- EaStCHEM School of Chemistry
- University of St Andrews
- St Andrews
- UK
| | - Garry S. Hanan
- Département de Chimie
- Université de Montréal
- Montréal
- Canada
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28
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Rousset E, Chartrand D, Ciofini I, Marvaud V, Hanan GS. Red-light-driven photocatalytic hydrogen evolution using a ruthenium quaterpyridine complex. Chem Commun (Camb) 2015; 51:9261-4. [DOI: 10.1039/c5cc02124c] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ruthenium tris-quaterpyridine complex, obtained in quantitative yield, is an excellent photosensitiser for photocatalytic hydrogen production, especially under red-light irradiation.
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Affiliation(s)
- E. Rousset
- Département de Chimie
- Université de Montréal
- Montréal
- Canada
- IPCM-CNRS UMR 8232
| | - D. Chartrand
- Département de Chimie
- Université de Montréal
- Montréal
- Canada
| | - I. Ciofini
- Laboratoire d'Electrochimie
- Chimie des Interfaces Modélisation pour l'Energie
- UMR CNRS-ENSCP-7575
- École Nationale Supérieure de Chimie de Paris
- Chimie ParisTech
| | - V. Marvaud
- IPCM-CNRS UMR 8232
- UPMC-Univ Paris 6
- 75252 Paris Cedex 05
- France
| | - G. S. Hanan
- Département de Chimie
- Université de Montréal
- Montréal
- Canada
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29
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Laramée-Milette B, Lussier F, Ciofini I, Hanan GS. A family of Ru(ii) complexes built on a novel sexipyridine building block: synthesis, photophysical properties and the rare structural characterization of a triruthenium species. Dalton Trans 2015; 44:11551-61. [DOI: 10.1039/c5dt00631g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A new sexipyridine ligand and its Ru(ii) family of complexes is described along with its characterization by electrochemical and photophysical methods as well as a rare X-ray analysis of a triruthenium polypyridine complex.
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Affiliation(s)
| | - Félix Lussier
- Département de Chimie
- Université de Montréal
- Montréal
- Canada
| | - Ilaria Ciofini
- PSL Research University
- Institut de Recherche de Chimie Paris IRCP
- CNRS – Chimie ParisTech
- F-75005 Paris
- France
| | - Garry S. Hanan
- Département de Chimie
- Université de Montréal
- Montréal
- Canada
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30
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Laramée-Milette B, Lachance-Brais C, Hanan GS. Synthesis of discrete Re(i) di- and tricarbonyl assemblies using a [4 × 1] directional bonding strategy. Dalton Trans 2015; 44:41-5. [DOI: 10.1039/c4dt03077j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Discrete assembly of two Re(i) squares was achieved by a simple [4 × 1] strategy where the complexes, [Re(4-pytpy-κ2N)(CO)3Br] and [Re(4-pytpy-κ3N)(CO)2Br], act as their own ligands. The properties of the assemblies and their precursors are described along with solid-state X-ray diffraction studies.
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Affiliation(s)
| | | | - Garry S. Hanan
- Départment de Chimie
- Université de Montréal
- Montréal
- Canada
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31
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Pal AK, Serroni S, Zaccheroni N, Campagna S, Hanan GS. Near infra-red emitting Ru(ii) complexes of tridentate ligands: electrochemical and photophysical consequences of a strong donor ligand with large bite angles. Chem Sci 2014. [DOI: 10.1039/c4sc01604a] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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32
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Pal AK, Hanan GS. Structural, electrochemical and photophysical investigations of Re(i)-complexes of κ3N-tridentate heterocyclic ligands. Dalton Trans 2014; 43:11811-4. [DOI: 10.1039/c4dt01454e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Pal AK, Hanan GS. Design, synthesis and excited-state properties of mononuclear Ru(ii) complexes of tridentate heterocyclic ligands. Chem Soc Rev 2014; 43:6184-97. [DOI: 10.1039/c4cs00123k] [Citation(s) in RCA: 136] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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34
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Pal AK, Laramée-Milette B, Hanan GS. Self-assembly of supramolecular triangles with neutral trans-PdCl2 directing units. RSC Adv 2014. [DOI: 10.1039/c4ra01596g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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