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Luo P, Karsenti PL, Brisard G, Marsan B, Harvey PD. Ultrafast Electron Transfers in Organometallic Supramolecular Assemblies Built with a NIR-Fluorescent Tetrabenzoporphyrine Dye and the Unsaturated Cluster Pd3(dppm)3(CO)2+. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00050] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peng Luo
- Département
de Chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
| | | | - Gessie Brisard
- Département
de Chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
| | - Benoit Marsan
- Département
de Chimie, Université du Québec à Montréal, Montréal, QC H2X 2J6, Canada
| | - Pierre D. Harvey
- Département
de Chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
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Luo P, Karsenti PL, Brisard G, Marsan B, Harvey PD. Electron-Transfer Kinetics within Supramolecular Assemblies of Donor Tetrapyrrolytic Dyes and an Acceptor Palladium Cluster. Inorg Chem 2016; 55:1894-904. [PMID: 26812277 DOI: 10.1021/acs.inorgchem.5b02788] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
9,18,27,36-Tetrakis[meso-(4-carboxyphenyl)]tetrabenzoporphyrinatozinc(II) (TCPBP, as a sodium salt) was prepared in order to compare its photoinduced electron-transfer behavior toward unsaturated cluster Pd3(dppm)3(CO)(2+) ([Pd3(2+)]; dppm = Ph2PCH2PPh2 as a PF6(-) salt) with that of 5,10,15,20-tetrakis[meso-(4-carboxyphenyl)]porphyrinatozinc(II) (TCPP) in nonluminescent assemblies of the type dye···[Pd3(2+)]x (x = 0-4; dye = TCPP and TCPBP) using femtosecond transient absorption spectroscopy. Binding constants extracted from UV-vis titration methods are the same as those extracted from fluorescence quenching measurements (static model), and both indicate that the TCPBP···[Pd3(2+)]x assemblies (K14 = 36000 M(-1)) are slightly more stable than those for TCPP···[Pd3(2+)]x (K14 = 27000 M(-1)). Density functional theory computations (B3LYP) corroborate this finding because the average ionic Pd···O distance is shorter in the TCPBP···[Pd3(2+)] assembly compared to that for TCPP···[Pd3(2+)]. Despite the difference in the binding constants and excited-state driving forces for the photoinduced electron transfer in dye*···[Pd3(2+)] → dye(•+)···[Pd3(•+)], the time scale for this process is ultrafast in both cases (<85 fs). The time scales for the back electron transfers (dye(•+)···[Pd3(•+)] → dye···[Pd3(2+)]) occurring in the various observed species (dye···[Pd3(2+)]x; x = 0-4) are the same for both series of assemblies. It is concluded that the structural modification on going from porphyrin to tetrabenzoporphyrin does not greatly affect the kinetic behavior in these processes.
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Affiliation(s)
- Peng Luo
- Département de chimie, Université de Sherbrooke , Sherbrooke, Quebec J1K 2R1, Canada
| | - Paul-Ludovic Karsenti
- Département de chimie, Université de Sherbrooke , Sherbrooke, Quebec J1K 2R1, Canada
| | - Gessie Brisard
- Département de chimie, Université de Sherbrooke , Sherbrooke, Quebec J1K 2R1, Canada
| | - Benoit Marsan
- Département de chimie, Université du Québec à Montréal , Montréal, Quebec H2X 2J6, Canada
| | - Pierre D Harvey
- Département de chimie, Université de Sherbrooke , Sherbrooke, Quebec J1K 2R1, Canada
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Molin SD, Mugnier Y, Fortin D, Harvey PD. The Pd3(dppm)3(CO)n clusters (n = 1−,2−); rare cases of anionic palladium species. Dalton Trans 2010; 39:8976-81. [DOI: 10.1039/c0dt00616e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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The First C 3-Symmetric P-Stereogenic Diphosphinomethane Trinuclear Palladium Clusters: Synthesis and Characterization. J CLUST SCI 2009. [DOI: 10.1007/s10876-009-0244-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Cugnet C, Molin SD, Brevet D, Lucas D, Mugnier Y, Harvey PD, Boeré RT. Alkyne adducts of paramagnetic and diamagnetic tripalladium clusters supported by dppm ligands. CAN J CHEM 2009. [DOI: 10.1139/v08-105] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The unsaturated redox-active cluster [Pd3(dppm)3(CO)]n+ (n = 0,1, or 2) reacts with ethylene dicarboxylic esters and a variety of terminal acetylenes (but not PhC≡CPh) in all three charge states. In particular, the radical cations [Pd3(dppm)3(CO)(RC≡CR′)].+ can be produced by several routes: one-electron electrochemical reduction of the dication adducts, comproportionation of the neutral and dicationic adducts, as well as the direct complexation of alkyne to the known radical cation [Pd3(dppm)3(CO)].+. Compared with the latter, each of the adducts have significantly extended lifetimes and classify as persistent radicals in solution. The alkyne adducts have been characterized by voltammetry (cyclic and rotating disk electrode), by UV – vis titrations and by MALDI-TOF mass spectra from dithranol matrices. Isotropic solution EPR spectra of the adducts with R = R′ = MeOC(O) and EtOC(O), as well as those with R′ = H and R = C6H5, FC6H4, HC≡CC6H4, and EtO have been obtained. Full line shape fitting simulations demonstrate that all display coupling to six different 31P (I = 1/2) and to one to three 106Pd (I = 5/2) nuclei. The A(31P) values range from a low of 3.0 × 104 to a high of 180.5 × 104 cm–1; this variation is caused by changes in the contribution of P s orbitals to the SOMO resulting from structural distortions of the Pd3P6 core upon alkyne coordination.Key words: electrochemistry, redox state, electron paramagnetic resonance, catalytic model, palladium, bridging phosphine.
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Dal Molin S, Cugnet C, Brevet D, Lucas D, Mugnier Y, Fortin D, Boeré RT, Harvey PD. Enhanced Stability of a Paramagnetic Palladium Complex Promoted by Interactions with Ethynyl Substrates. Organometallics 2007. [DOI: 10.1021/om700377a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sophie Dal Molin
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR CNRS 5260, Faculté des Sciences Mirande, Université de Bourgogne, 9 Avenue Alain Savary, BP 47870, 21078 Dijon Cedex, France, Département de Chimie, Université de Sherbrooke, Sherbrooke J1K 2R1, Québec, Canada, and the Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge T1K 3M4, Alberta, Canada
| | - Cyril Cugnet
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR CNRS 5260, Faculté des Sciences Mirande, Université de Bourgogne, 9 Avenue Alain Savary, BP 47870, 21078 Dijon Cedex, France, Département de Chimie, Université de Sherbrooke, Sherbrooke J1K 2R1, Québec, Canada, and the Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge T1K 3M4, Alberta, Canada
| | - David Brevet
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR CNRS 5260, Faculté des Sciences Mirande, Université de Bourgogne, 9 Avenue Alain Savary, BP 47870, 21078 Dijon Cedex, France, Département de Chimie, Université de Sherbrooke, Sherbrooke J1K 2R1, Québec, Canada, and the Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge T1K 3M4, Alberta, Canada
| | - Dominique Lucas
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR CNRS 5260, Faculté des Sciences Mirande, Université de Bourgogne, 9 Avenue Alain Savary, BP 47870, 21078 Dijon Cedex, France, Département de Chimie, Université de Sherbrooke, Sherbrooke J1K 2R1, Québec, Canada, and the Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge T1K 3M4, Alberta, Canada
| | - Yves Mugnier
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR CNRS 5260, Faculté des Sciences Mirande, Université de Bourgogne, 9 Avenue Alain Savary, BP 47870, 21078 Dijon Cedex, France, Département de Chimie, Université de Sherbrooke, Sherbrooke J1K 2R1, Québec, Canada, and the Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge T1K 3M4, Alberta, Canada
| | - Daniel Fortin
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR CNRS 5260, Faculté des Sciences Mirande, Université de Bourgogne, 9 Avenue Alain Savary, BP 47870, 21078 Dijon Cedex, France, Département de Chimie, Université de Sherbrooke, Sherbrooke J1K 2R1, Québec, Canada, and the Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge T1K 3M4, Alberta, Canada
| | - René T. Boeré
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR CNRS 5260, Faculté des Sciences Mirande, Université de Bourgogne, 9 Avenue Alain Savary, BP 47870, 21078 Dijon Cedex, France, Département de Chimie, Université de Sherbrooke, Sherbrooke J1K 2R1, Québec, Canada, and the Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge T1K 3M4, Alberta, Canada
| | - Pierre D. Harvey
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR CNRS 5260, Faculté des Sciences Mirande, Université de Bourgogne, 9 Avenue Alain Savary, BP 47870, 21078 Dijon Cedex, France, Département de Chimie, Université de Sherbrooke, Sherbrooke J1K 2R1, Québec, Canada, and the Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge T1K 3M4, Alberta, Canada
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Cugnet C, Mugnier Y, Dal Molin S, Brevet D, Lucas D, Harvey PD. Thermal and Electrochemically Assisted Pd−Cl Bond Cleavage in the d9−d9 Pd2(dppm)2Cl2 Complex by Pd3(dppm)3(CO)n+ Clusters (n = 2, 1, 0). Inorg Chem 2007; 46:3083-8. [PMID: 17371010 DOI: 10.1021/ic061777h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new aspect of reactivity of the cluster [Pd3(dppm)3(micro3-CO)]n+, ([Pd3]n+, n = 2, 1, 0) with the low-valent metal-metal-bonded Pd2(dppm)2Cl2 dimer (Pd2Cl2) was observed using electrochemical techniques. The direct reaction between [Pd3]2+ and Pd2Cl2 in THF at room temperature leads to the known [Pd3(dppm)3(micro3-CO)(Cl)]+ ([Pd3(Cl)]+) adduct and the monocationic species Pd2(dppm)2Cl+ (very likely as Pd2(dppm)2(Cl)(THF)+, [Pd2Cl]+) as unambiguously demonstrated by UV-vis and 31P NMR spectroscopy. In this case, [Pd3]2+ acts as a strong Lewis acid toward the labile Cl- ion, which weakly dissociates from Pd2Cl2 (i.e., dissociative mechanism). Host-guest interactions between [Pd3]2+ and Pd2Cl2 seem unlikely on the basis of computer modeling because of the strong screening of the Pd-Cl fragment by the Ph-dppm groups in Pd2Cl2. The electrogenerated clusters [Pd3]+ and [Pd3]0 also react with Pd2Cl2 to unexpectedly form the same oxidized adduct, [Pd3(Cl)]+, despite the known very low affinity of [Pd3]+ and [Pd3]0 toward Cl- ions. The reduced biproduct in this case is the highly reactive zerovalent species "Pd2(dppm)2" or "Pd(dppm)" as demonstrated by quenching with CDCl3 (forming the well-known complex Pd(dppm)Cl2) or in presence of dppm (forming the known Pd2(dppm)3 d10-d10 dimer). To bring these halide-electron exchange reactions to completion for [Pd3]+ and [Pd3]0, 0.5 and 1.0 equiv of Pd2Cl2 are necessary, respectively, accounting perfectly for the number of exchanged electrons. The presence of a partial dissociation of Pd2Cl2 into the Cl- ion and the monocation [Pd2Cl]+, which is easier to reduce than Pd2Cl2, is suggested to explain the overall electrochemical results. It is possible to regulate the nature of the species formed from Pd2Cl2 by changing the state of charge of the title cluster.
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Affiliation(s)
- Cyril Cugnet
- Institut de Chimie Moléculaire de l'Université de Bourgogne, UMR CNRS 5260, Université de Bourgogne, Faculté des Sciences Mirande, Dijon, France
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Cugnet C, Lucas D, Lemaître F, Collange E, Soldera A, Mugnier Y, Harvey PD. Unexpected reaction of the unsaturated cluster host and catalyst [Pd3(mu3-CO)(dppm)3]2+ with the hydroxide ion: spectroscopic and kinetic evidence of an inner-sphere mechanism. Chemistry 2006; 12:8386-95. [PMID: 16897803 DOI: 10.1002/chem.200600395] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The title cluster, [Pd(3)(mu(3)-CO)(dppm)(3)](2+) (dppm=bis(diphenylphosphino)methane), reacts with one equivalent of hydroxide anions (OH(-)), from tetrabutylammonium hydroxide (Bu(4)NOH), to give the paramagnetic [Pd(3)(mu(3)-CO)(dppm)(3)](+) species. Reaction with another equivalent of OH(-) leads to the zero-valent compound [Pd(3)(mu(3)-CO)(dppm)(3)](0). From electron paramagnetic resonance analysis of the reaction medium using the spin-trap agent 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), the 2-tetrahydrofuryl or methyl radicals, deriving from the tetrahydrofuran (THF) or dimethyl sulfoxide (DMSO) solvent, respectively, were detected. For both [Pd(3)(mu(3)-CO)(dppm)(3)](2+) and [Pd(3)(mu(3)-CO)(dppm)(3)](+), the mechanism involves, in a first equilibrated step, the formation of a hydroxide adduct, [Pd(3)(mu(3)-CO)(dppm)(3)(OH)]((n-1)+) (n=1, 2), which reacts irreversibly with the solvent. The kinetics were resolved by means of stopped-flow experiments and are consistent with the proposed mechanism. In the presence of an excess of Bu(4)NOH, an electrocatalytic process was observed with modest turnover numbers (7-8). The hydroxide adducts [Pd(3)(mu(3)-CO)(dppm)(3)(OH)]((n-1)+) (n=1, 2), which bear important similarities to the well-known corresponding halide adducts [Pd(3)(mu(3)-CO)(dppm)(3)(mu(3)-X)](n) (X=Cl, Br, I), have been studied by using density functional theory (DFT). Although the optimised geometry for the cluster in its +2 and 0 oxidation states (i.e., cation and anion clusters, respectively) is the anticipated mu(3)-OH form, the paramagnetic species, [Pd(3)(mu(3)-CO)(dppm)(3)(OH)](0), shows a mu(2)-OH form; this suggests an important difference in electronic structure between these three species.
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Affiliation(s)
- Cyril Cugnet
- Université de Bourgogne, Laboratoire de Synthèse et Electrosynthèse Organométalliques, CNRS UMR 5188, Faculté des Sciences Mirande, 9 Avenue Alain Savary, 21000 Dijon, France
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Lucas D, Lemaître F, Gallego‐Gómez B, Cugnet C, Richard P, Mugnier Y, Harvey PD. New Insights into the Stoichiometric and Catalytic Reactivity of Unsaturated Pd
3
(dppm)
3
CO
n
+
Clusters (
n
= 0, 1) Towards Halocarbons – First Evidence for Inorganic By‐Products. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200400594] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dominique Lucas
- Laboratoire de Synthèse et d'Electrosynthèse Organométalliques, CNRS UMR 5188, Faculté des Sciences Mirande, Université de Bourgogne, 9 avenue Alain Savary, 21100 Dijon, France, Fax: +33‐380‐39‐36‐64
| | - Frédéric Lemaître
- Laboratoire de Synthèse et d'Electrosynthèse Organométalliques, CNRS UMR 5188, Faculté des Sciences Mirande, Université de Bourgogne, 9 avenue Alain Savary, 21100 Dijon, France, Fax: +33‐380‐39‐36‐64
- Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1, Fax: +1‐819‐821‐8017
| | - Beatriz Gallego‐Gómez
- Laboratoire de Synthèse et d'Electrosynthèse Organométalliques, CNRS UMR 5188, Faculté des Sciences Mirande, Université de Bourgogne, 9 avenue Alain Savary, 21100 Dijon, France, Fax: +33‐380‐39‐36‐64
| | - Cyril Cugnet
- Laboratoire de Synthèse et d'Electrosynthèse Organométalliques, CNRS UMR 5188, Faculté des Sciences Mirande, Université de Bourgogne, 9 avenue Alain Savary, 21100 Dijon, France, Fax: +33‐380‐39‐36‐64
| | - Philippe Richard
- Laboratoire de Synthèse et d'Electrosynthèse Organométalliques, CNRS UMR 5188, Faculté des Sciences Mirande, Université de Bourgogne, 9 avenue Alain Savary, 21100 Dijon, France, Fax: +33‐380‐39‐36‐64
| | - Yves Mugnier
- Laboratoire de Synthèse et d'Electrosynthèse Organométalliques, CNRS UMR 5188, Faculté des Sciences Mirande, Université de Bourgogne, 9 avenue Alain Savary, 21100 Dijon, France, Fax: +33‐380‐39‐36‐64
| | - Pierre D. Harvey
- Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1, Fax: +1‐819‐821‐8017
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Mongrain P, Douville J, Gagnon J, Drouin M, Decken A, Fortin D, Harvey PD. New insights about the hostguest chemistry of the tungsten oxo complex of calix[4]arene, and novel "one pot" difunctionalizations of calix[4]arene using tetrachlorometal(VI) oxide (M = Mo, W). CAN J CHEM 2004. [DOI: 10.1139/v04-097] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The strong Lewis acid tungsten oxo complex of calix[4]arene can be obtained in both hydrated and non-hydrated forms. This complex coordinates a water molecule inside the cavity via strong O···W interactions with relatively short distances of 2.284(4) and 2.329(2) Å for the tungsten oxo complex of calix[4]arene··H2O·aniline (1), and the tungsten oxo complex of calix[4]arene·H2O·toluene (2·toluene), respectively. The strong interactions are also deduced by the relatively high H2O elimination temperature observed by TGA and DSC (above 200 °C). The coordinated water molecule inside the calix[4]arene cavity is characterized by a strong IR absorption at 3616 cm1, and a narrow resonance at ~1.2 ppm (the chemical shifts of the uncoordinated water are 1.55 and 1.60 ppm in C6D6 and CDCl3, respectively). This water molecule gives rise to H-bonds with aniline in 1. The tungsten oxo complex of 5,11,17,23-tetrabromocalix[4]arene (4), also binds H2O as the characteristic signatures are observed. The successful removal of H2O in 2, is performed under mild conditions using bis(tetrahydrofuran)-uranyl nitrate as a competitive Lewis acid. When this reaction is performed in acetonitrile, butyronitrile or tert-butylnitrile, the corresponding tungsten oxo complexes of calix[4]arene·acetonitrile (3), ·butyronitrile (5), and ·tert-butylnitrile (6) are obtained. The use of uranyl as a H2O abstractor is unprecedented. The X-ray structure of 3 consists of a tungsten oxo complex of calix[4]arene coordinated by an acetonitrile molecule (d(W···N = 2.412(2) Å). The tetra-5,11,17,23-choromethyl-25,26,27,28-tetrahydroxycalix[4]arene reacts with M(O)Cl4 (M = Mo, W) in a 1:1 stoichiometry, via a tetra FriedelCrafts addition of benzene or toluene, followed by a lower-rim complexation of the metal oxide, to form "flower-shaped" calix[4]arenes. This "one pot" double functionalization is unprecedented.Key words: calix[4]arene, tungsten, molybdenum, X-ray, hostguest, FriedelCrafts, Lewis acid, uranyl, DSC, TGA.
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