Vincent Pons

Universitat de València

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D. Michael Heinekey

University of Washington

Karen I. Goldberg

University of Pennsylvania

Travis J. Hebden

University of Washington

R. Tom Baker

University of Ottawa

M.C. Denney

University of Washington

S. Beaumont

P. Dauban

R.H. Dodd

Centre National de la Recherche Scientifique

François Malbosc

Sanofi (France)

C.Serra-Le Berre

Laboratoire de Chimie de Coordination

Cooperative Institutions

University of Washington

Los Alamos National Laboratory

Centre National de la Recherche Scientifique

Argonne National Laboratory

University of Oxford

Pacific Northwest National Laboratory

Université Toulouse III - Paul Sabatier

Rutherford Appleton Laboratory

Laboratoire de Chimie de Coordination

Los Alamos Medical Center

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Lösliche hochpolymere Bor‐Stickstoff‐Verbindungen durch Metallkomplex‐katalysierte Dehydrierungen von Amin‐Boran‐Addukten

Angewandte Chemie (2008)

Vincent Pons R. Tom Baker

In die richtigen Bahnen lenken lassen sich nach den Befunden von Manners et al. Reaktionen von Boranen unter homogener Katalyse. Dabei entstehen aus Addukten primärer Amine mit Boranen lösliche Aminoboran-Polymere und -Copolymere (siehe Schema; pocop=ϰ3-1,3-(OPtBu2)2C6H3). Solche metallkatalysierten Dehydrokupplungen zur Synthese neuartiger B-N-Analoga von α-Olefinen sind von großer Bedeutung für die Materialwissenschaften.

10.1002/ange.200803089

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Citations (23)

Efficient Catalysis of Ammonia Borane Dehydrogenation

Journal of the American Chemical Society (2006)

M.C. Denney Vincent Pons Travis J. Hebden D. Michael Heinekey Karen I. Goldberg

In the presence of an iridium pincer complex, dehydrogenation of ammonia borane (H3NBH3) occurs rapidly at room temperature in tetrahydrofuran to generate 1.0 equivalent of H2 and [NH2BH2]5. A metal borohydride complex has been isolated as a dormant form of the catalyst which can be reactivated by reaction with H2.

Ammonia Borane

Borohydride

Tetrahydrofuran

Boranes

10.1021/ja062419g

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Citations (608)

CCDC 756163: Experimental Crystal Structure Determination

The Cambridge Structural Database (2010)

S. Beaumont Vincent Pons P. Retailleau R.H. Dodd P. Dauban

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/cctcvcc

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An Elongated Dihydrogen Complex of Iridium

Journal of the American Chemical Society (2003)

Vincent Pons D. Michael Heinekey

Reaction of [Cp*Ir(dmpm)Cl]Cl with [Et3Si]B(ArF)4 (dmpm = bisdimethyl-phosphinomethane; ArF = C6F5) under hydrogen gas affords the dicationic complex [Cp*Ir(dmpm)H2]2+ (1), which is readily deprotonated by weak bases to give [Cp*Ir(dmpm)H]+. Complex 1 exists as a mixture of two isomers (97:3). On the basis of the magnitude of 2JH-P couplings and T1 measurements, a cis-dihydride or dihydrogen complex structure is suggested for the predominant isomer 1-cis (2JH-P = 6 Hz), with the minor isomer assigned a transoid structure 1-trans (2JH-P = 20 Hz). When the preparative reaction is carried out with HD gas, the resonance in the 1H NMR spectrum assigned to 1-cis-d1 exhibits1JH-D = 9.0 Hz. The observed values of 1JH-D vary significantly with temperature, increasing from 7.0 Hz at 223K to 9.0 Hz at 300 K. The observed chemical shift of 1-cis-d1 also varies significantly with temperature. These observations are interpreted in terms of a dynamic equilibrium between a cis-dihydride and a dihydrogen complex.

Dihydrogen complex

Cis–trans isomerism

10.1021/ja035555j

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Citations (29)

Effect of compost amendment on soil organic matter and humic substances

EGUGA (2009)

Luis Roca‐Pérez C. Gil M.M. Jurado Vincent Pons Rafael Boluda

Amendment

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Synthesis and Characterization of a Dicationic Dihydrogen Complex of Iridium with a Bis-carbene Ligand Set

Organometallics (2005)

Matthias Vogt Vincent Pons D. Michael Heinekey

Reaction of [Cp*Ir(CH3CN)3][PF6]2 with methylenebis(N-methylimidazolium) iodide in the presence of Et3N affords [Cp*Ir(C−C)I]PF6 (1) (C−C = bis-carbene). The structure of complex 1 was confirmed by X-ray crystallography. The chloride analogue [Cp*Ir(C−C)Cl]X (2) was similarly prepared from [Cp*Ir(CH3CN)3][PF6]2 (X = PF6) or [Cp*IrCl2]2 (X = Cl) and methylenebis(N-methylimidazolium) chloride. Reaction of 2 (X = Cl) with Et3SiB(C6F5)4 under hydrogen gas gives the dicationic dihydrogen complex [Cp*Ir(C−C)(H2)]2+ (3). Complex 3 is identified as a dihydrogen complex based on T1(min) = 37 ms for the hydride resonance (240 K, 750 MHz) and JHD = 23.5 Hz in the partially deuterated analogue.

Dihydrogen complex

Hydrogen iodide

10.1021/om049045p

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Citations (70)

σ-Borane Complexes of Iridium: Synthesis and Structural Characterization

Journal of the American Chemical Society (2008)

Travis J. Hebden M.C. Denney Vincent Pons P.M.B. Piccoli Thomas F. Koetzle

Reaction of NaBH4 with (tBuPOCOP)IrHCl affords the previously reported complex (tBuPOCOP)IrH2(BH3) (1) (tBuPOCOP = kappa(3)-C6H3-1,3-[OP(tBu)2]2). The structure of 1 determined from neutron diffraction data contains a B-H sigma-bond to iridium with an elongated B-H bond distance of 1.45(5) A. Compound 1 crystallizes in the space group P1 (Z = 2) with a = 8.262 (5) A, b = 12.264 (5) A, c = 13.394 (4) A, and V = 1256.2 (1) A(3) (30 K). Complex 1 can also be prepared by reaction of BH3 x THF with (tBuPOCOP)IrH2. Reaction of (tBuPOCOP)IrH2 with pinacol borane gave initially complex 2, which is assigned a structure analogous to that of 1 based on spectroscopic measurements. Complex 2 evolves H2 at room temperature leading to the borane complex 3, which is formed cleanly when 2 is subjected to dynamic vacuum. The structure of 3 has been determined by X-ray diffraction and consists of the (tBuPOCOP)Ir core with a sigma-bound pinacol borane ligand in an approximately square planar complex. Compound 3 crystallizes in the space group C2/c (Z = 4) with a = 41.2238 (2) A, b = 11.1233 (2) A, c = 14.6122 (3) A, and V = 6700.21 (19) A(3) (130 K). Reaction of (tBuPOCOP)IrH2 with 9-borobicyclononane (9-BBN) affords complex 4. Complex 4 displays (1)H NMR resonances analogous to 1 and exists in equilibrium with (tBuPOCOP)IrH2 in THF solutions.

Boranes

Pinacol

10.1021/ja801898m

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Citations (116)

CHEMICAL HYDROGEN STORAGE AT LOS ALAMOS

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2007)

John C. Gordon R. Tom Baker Anthony K. Burrell Benjamin L. Davis H.V.K. Diyabalanage

National laboratory

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Coordination of aminoborane, NH2BH2, dictates selectivity and extent of H2 release in metal-catalysed ammonia borane dehydrogenation

Chemical Communications (2008)

Vincent Pons R. Tom Baker Nathaniel K. Szymczak David J. Heldebrant John C. Linehan

In situ(11)B NMR monitoring, computational modeling, and external trapping studies show that selectivity and extent of H(2) release in metal-catalysed dehydrogenation of ammonia borane, NH(3)BH(3), are determined by coordination of reactive aminoborane, NH(2)BH(2), to the metal center.

Ammonia Borane

Boranes

10.1039/b809190k

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Citations (173)

CCDC 716149: Experimental Crystal Structure Determination

The Cambridge Structural Database (2009)

Travis J. Hebden M.C. Denney Vincent Pons P.M.B. Piccoli Thomas F. Koetzle

10.5517/ccs16ll

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