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Doyle LR, Scott DJ, Hill PJ, Fraser DAX, Myers WK, White AJP, Green JC, Ashley AE. Reversible coordination of N 2 and H 2 to a homoleptic S = 1/2 Fe(i) diphosphine complex in solution and the solid state. Chem Sci 2018; 9:7362-7369. [PMID: 30542539 PMCID: PMC6237127 DOI: 10.1039/c8sc01841c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 07/17/2018] [Indexed: 01/22/2023] Open
Abstract
The synthesis and characterisation of the S = 1/2 Fe(i) complex [Fe(depe)2]+[BArF4]- ([1]+[BArF4]-), and the facile reversible binding of N2 and H2 in both solution and the solid state to form the adducts [1·N2]+ and [1·H2]+, are reported. Coordination of N2 in THF is thermodynamically favourable under ambient conditions (1 atm; ΔG 298 = -4.9(1) kcal mol-1), while heterogenous binding is more favourable for H2 than N2 by a factor of ∼300. [1·H2]+[BArF4]- represents a rare example of a well-defined, open-shell, non-classical dihydrogen complex, as corroborated by ESR spectroscopy. The rapid exchange between N2 and H2 coordination under ambient conditions is unique for a paramagnetic Fe complex.
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Affiliation(s)
- Laurence R Doyle
- Department of Chemistry , Imperial College London , London SW7 2AZ , UK .
| | - Daniel J Scott
- Department of Chemistry , Imperial College London , London SW7 2AZ , UK .
| | - Peter J Hill
- Department of Chemistry , Imperial College London , London SW7 2AZ , UK .
| | - Duncan A X Fraser
- Department of Chemistry , Imperial College London , London SW7 2AZ , UK .
| | - William K Myers
- Inorganic Chemistry Laboratory , University of Oxford , Oxford OX1 3QR , UK
| | - Andrew J P White
- Department of Chemistry , Imperial College London , London SW7 2AZ , UK .
| | - Jennifer C Green
- Inorganic Chemistry Laboratory , University of Oxford , Oxford OX1 3QR , UK
| | - Andrew E Ashley
- Department of Chemistry , Imperial College London , London SW7 2AZ , UK .
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2
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Lucier BEG, Zhang Y, Lee KJ, Lu Y, Huang Y. Grasping hydrogen adsorption and dynamics in metal-organic frameworks using (2)H solid-state NMR. Chem Commun (Camb) 2016; 52:7541-4. [PMID: 27181834 DOI: 10.1039/c6cc03205b] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Record greenhouse gas emissions have spurred the search for clean energy sources such as hydrogen (H2) fuel cells. Metal-organic frameworks (MOFs) are promising H2 adsorption and storage media, but knowledge of H2 dynamics and adsorption strengths in these materials is lacking. Variable-temperature (VT) (2)H solid-state NMR (SSNMR) experiments targeting (2)H2 gas (i.e., D2) shed light on D2 adsorption and dynamics within six representative MOFs: UiO-66, M-MOF-74 (M = Zn, Mg, Ni), and α-M3(COOH)6 (M = Mg, Zn). D2 binding is relatively strong in Mg-MOF-74, Ni-MOF-74, α-Mg3(COOH)6, and α-Zn3(COOH)6, giving rise to broad (2)H SSNMR powder patterns. In contrast, D2 adsorption is weaker in UiO-66 and Zn-MOF-74, as evidenced by the narrow (2)H resonances that correspond to rapid reorientation of the D2 molecules. Employing (2)H SSNMR experiments in this fashion holds great promise for the correlation of MOF structural features and functional groups/metal centers to H2 dynamics and host-guest interactions.
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Affiliation(s)
- Bryan E G Lucier
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada.
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Prack E, O'Keefe CA, Moore JK, Lai A, Lough AJ, Macdonald PM, Conradi MS, Schurko RW, Fekl U. A Molecular Rotor Possessing an H-M-H "Spoke" on a P-M-P "Axle": A Platinum(II) trans-Dihydride Spins Rapidly Even at 75 K. J Am Chem Soc 2015; 137:13464-7. [PMID: 26448538 DOI: 10.1021/jacs.5b08213] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new class of low-barrier molecular rotors, metal trans-dihydrides, is suggested here. To test whether rapid rotation can be achieved, the known complex trans-H2Pt(P(t)Bu3)2 was experimentally studied by (2)H and (195)Pt solid-state NMR spectroscopy (powder pattern changes with temperature) and computationally modeled as a (t)Bu3P-Pt-P(t)Bu3 stator with a spinning H-Pt-H rotator. Whereas the related chloro-hydride complex, trans-H(Cl)Pt(P(t)Bu3)2, does not show rotational behavior at room temperature, the dihydride trans-H2Pt(P(t)Bu3)2 rotates fast on the NMR time scale, even at low temperatures down to at least 75 K. The highest barrier to rotation is estimated to be ∼3 kcal mol(-1), for the roughly 3 Å long rotator in trans-H2Pt(P(t)Bu3)2.
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Affiliation(s)
- Ernest Prack
- University of Toronto , Mississauga Campus, 3359 Mississauga Road, Mississauga, Ontario, Canada L5L 1C6
| | | | - Jeremy K Moore
- Washington University, St. Louis , One Brookings Drive, St. Louis, Missouri 63130-4899, United States
| | - Angel Lai
- University of Toronto , Mississauga Campus, 3359 Mississauga Road, Mississauga, Ontario, Canada L5L 1C6
| | - Alan J Lough
- University of Toronto , St. George Campus, 80 St. George St., Toronto, Ontario, Canada M5S 3H6
| | - Peter M Macdonald
- University of Toronto , Mississauga Campus, 3359 Mississauga Road, Mississauga, Ontario, Canada L5L 1C6
| | - Mark S Conradi
- Washington University, St. Louis , One Brookings Drive, St. Louis, Missouri 63130-4899, United States
| | - Robert W Schurko
- University of Windsor , 401 Sunset Ave., Windsor, Ontario, Canada , N9B 3P4
| | - Ulrich Fekl
- University of Toronto , Mississauga Campus, 3359 Mississauga Road, Mississauga, Ontario, Canada L5L 1C6
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Gutmann T, del Rosal I, Chaudret B, Poteau R, Limbach HH, Buntkowsky G. From Molecular Complexes to Complex Metallic Nanostructures-2H Solid-State NMR Studies of Ruthenium-Containing Hydrogenation Catalysts. Chemphyschem 2013; 14:3026-33. [DOI: 10.1002/cphc.201300200] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Indexed: 11/08/2022]
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Jiang Y, Hess J, Fox T, Berke H. Rhenium Hydride/Boron Lewis Acid Cocatalysis of Alkene Hydrogenations: Activities Comparable to Those of Precious Metal Systems. J Am Chem Soc 2010; 132:18233-47. [DOI: 10.1021/ja107187r] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yanfeng Jiang
- Anorganisch-Chemisches Institut, Universität Zürich, Winterthurerstrasse 190, CH-8037 Zürich, Switzerland
| | - Jeannine Hess
- Anorganisch-Chemisches Institut, Universität Zürich, Winterthurerstrasse 190, CH-8037 Zürich, Switzerland
| | - Thomas Fox
- Anorganisch-Chemisches Institut, Universität Zürich, Winterthurerstrasse 190, CH-8037 Zürich, Switzerland
| | - Heinz Berke
- Anorganisch-Chemisches Institut, Universität Zürich, Winterthurerstrasse 190, CH-8037 Zürich, Switzerland
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Gerber R, Fox T, Frech C. P Csp3 P and P Csp2 P Palladium(II) Hydride Pincer Complexes: Small Structural Difference-Large Effect on Reactivity. Chemistry 2010; 16:6771-5. [DOI: 10.1002/chem.201000247] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Macholl S, Matthes J, Limbach HH, Sabo-Etienne S, Chaudret B, Buntkowsky G. High-resolution 2H MAS NMR applied to deuterium analogs of hydrido eta2-dihydrogen complexes. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2009; 36:137-143. [PMID: 19781918 DOI: 10.1016/j.ssnmr.2009.08.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2009] [Revised: 08/03/2009] [Accepted: 08/14/2009] [Indexed: 05/28/2023]
Abstract
(2)H solid-state, variable temperature magic angle spinning (MAS) NMR spectra of precipitated samples of the deutero dideuterium complexes Ru(D)(2)(eta(2)-D(2))(2)(PCy(3))(2) and RuD(eta(2)-D(2))I(PCy(3))(2) [Cy=cyclohexyl] are presented. They show that even at moderate MAS speed, high resolution is achieved at 7 and 14T allowing (2)H chemical shifts and quadrupole couplings to be obtained and assigned to different solid and gaseous (2)H species. These two parameters allow identifying chemically different hydrogen species in the material. The analysis of these parameters in this study reveals the presence of three different species in the sample, namely the complexes RuD(eta(2)-D(2))I(PCy(3))(2) and RuD(eta(2)-D(2))(2)I(PCy(3))(2), and highly mobile HD/D(2). These assignments are supported by (2)H T(1) relaxation times and (31)P MAS NMR spectra. Moreover, variable temperature MAS NMR spectra reveal temperature-dependent line-shape changes, which are clear indications of intramolecular hydrogen exchange of the deutero and the dideuterium ligands and which give an estimate for the activation energy of this process.
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Affiliation(s)
- Sven Macholl
- Freie Universität Berlin, Institut für Chemie und Biochemie, Takustr. 3, 14195 Berlin, Germany.
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Field LD, Shaw WJ, Clentsmith GK. A quantitative measure of the ionicity of selected iron hydride species by examination of the deuterium quadrupole coupling constant (DQCC). J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2007.03.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Major Q, Lough AJ, Gusev DG. Substituents Effects in POP Pincer Complexes of Ruthenium. Organometallics 2005. [DOI: 10.1021/om050053v] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Quinn Major
- Department of Chemistry, Wilfrid Laurier University, Waterloo, Ontario, Canada N2L 3C5, and Department of Chemistry, University of Toronto, Toronto, Ontario, Canada M5S 3H6
| | - Alan J. Lough
- Department of Chemistry, Wilfrid Laurier University, Waterloo, Ontario, Canada N2L 3C5, and Department of Chemistry, University of Toronto, Toronto, Ontario, Canada M5S 3H6
| | - Dmitry G. Gusev
- Department of Chemistry, Wilfrid Laurier University, Waterloo, Ontario, Canada N2L 3C5, and Department of Chemistry, University of Toronto, Toronto, Ontario, Canada M5S 3H6
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Gusev DG. Effect of weak interactions on the H...H distance in stretched dihydrogen complexes. J Am Chem Soc 2004; 126:14249-57. [PMID: 15506792 DOI: 10.1021/ja0465956] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Computational and experimental results presented in this paper demonstrate that the H-H distance in stretched dihydrogen complexes can be hypersensitive to a variety of weak intra- and intermolecular interactions, including those with bulky ligands and solvent molecules, hydrogen-bonding interactions, or ion-pairing. Particularly, the complex IrH(H...H)Cl(2)(P(i)Pr(3))(2) which contains a stretched dihydrogen ligand in the crystalline form, as shown by neutron diffraction, is a trihydride in solution. The difference is due to the intermolecular Ir-Cl...H-Ir hydrogen bonding in the solid.
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Affiliation(s)
- Dmitry G Gusev
- Department of Chemistry, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5 Canada.
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Kwak HT, Srinivasan P, Quine J, Massiot D, Gan Z. Satellite transition rotational resonance of homonuclear quadrupolar spins: magic-angle effect on spin-echo decay and inversion recovery. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00958-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Wi S, Logan JW, Sakellariou D, Walls JD, Pines A. Rotary resonance recoupling for half-integer quadrupolar nuclei in solid-state nuclear magnetic resonance spectroscopy. J Chem Phys 2002. [DOI: 10.1063/1.1506907] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Law JK, Mellows H, Heinekey DM. Synthesis and spectroscopic properties of elongated ruthenium dihydrogen complexes: temperature and isotope dependence of H-H distances. J Am Chem Soc 2002; 124:1024-30. [PMID: 11829611 DOI: 10.1021/ja0118284] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Several dihydrogen complexes of ruthenium of the form [Cp/Cp*Ru(P-P)H(2)](+) (P-P = chelating diphosphine ligand) have been prepared by reaction of the corresponding neutral chloride complexes with H(2) in the presence of NaB(ArF)(4). Treatment with D(2) or T(2) gas leads to incorporation of deuterium or tritium in the dihydrogen ligand. Measurement of the resulting H-D and H-T couplings as a function of the temperature and magnetic field gives results consistent with computational studies which predict that the H-H bond distance will increase with temperature and will be significantly shortened by isotopic substitution. The degree of the observed temperature dependence is found to be a critical function of the ancillary ligand set.
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Affiliation(s)
- James K Law
- Department of Chemistry, Box 351700, University of Washington, Seattle, Washington 98195-1700, USA
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Edén M, Frydman L. Quadrupolar-driven recoupling of homonuclear dipolar interactions in the nuclear magnetic resonance of rotating solids. J Chem Phys 2001. [DOI: 10.1063/1.1344886] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Bakhmutov VI, Bianchini C, Peruzzini M, Vizza F, Vorontsov EV. 1H- and 2H-T1 relaxation behavior of the rhodium dihydrogen complex [(triphos)Rh(eta 2-H2)H2]+. Inorg Chem 2000; 39:1655-60. [PMID: 12526550 DOI: 10.1021/ic990667q] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Protonation of the classical trihydride [(triphos)RhH3] (2) at 210 K in either THF or CH2Cl2 by either HBF4.OMe2 or CF3SO2OH gives the nonclassical eta 2-H2 complex [(triphos)Rh(eta 2-H2)H2]+ (1) [triphos = MeC(CH2PPh2)3]. Complex 1 is thermally unstable and highly fluxional in solution. In THF above 230 K, 1 transforms into the solvento dihydride complex [(triphos)Rh(eta 1-THF-d8)H2]+ (5) that, at room temperature, quickly converts to the stable dimer trans-[[(triphos)RhH]2(mu-H)2]2+ (trans-6). In CH2Cl2, 1 is stable up to 240 K. Above this temperature, the eta 2-H2 complex begins to convert into a mixture of trans- and cis-6, which, in turn, transform into the bridging-chloride dimers trans- and cis-[[(triphos)RhH]2(mu-Cl)2]2+ at room temperature. Complex 1 contains a fast-spinning H2 ligand with a T1min of 38.9 ms in CD2Cl2 (220 K, 400 MHz). An NMR analysis of the bis-deuterated isotopomer [(triphos)RhH2D2]+ (1-d2) did not provide a J(HD) value. At 190 K, the perdeuterated isotopomers [(triphos)RhD3] (2-d3) and 1-d4 show T1min values of 16.5 and 32.6 ms (76.753 MHz), respectively, for the rapidly exchanging deuterides. An analogous 2-fold elongation of T1min is also observed on going from [(triphos)IrD3] to [(triphos)Ir(eta 2-D2)D2]+. A rationale for the elongation of T1min in nonclassical polyhydrides is proposed on the basis of both the results obtained and recent literature reports.
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Affiliation(s)
- V I Bakhmutov
- Institute of Organo-Element Compounds of the Russian Academy of Sciences, 28 Vavilova, Moscow 117813, Russia
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