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Staff information

R Morris Bullock

Lab Fellow, Chemist
Pacific Northwest National Laboratory
PO Box 999
MSIN: K2-12
Richland, WA 99352

Biography

Morris Bullock is the Director of the Center for Molecular Electrocatalysis, an Energy Frontier Research Center. He is a Laboratory Fellow in the Physical Sciences Division at Pacific Northwest National Laboratory. From 1985-2006, he was in the Chemistry Department at Brookhaven National Laboratory (Long Island, New York).

Research Interests

  • Research in the Center for Molecular Electrocatalysis focuses on the development of molecular transition metal electrocatalysts for multi-proton, multi-electron reactions that are needed for a secure energy future. Our research seeks to understand how proton relays can regulate the movement of protons and electrons to enhance the rates of electrocatalysts. Proton relays are typically pendant amines in the second coordination sphere of the metal catalyst. The focus of our studies are on catalysts for oxidation of hydrogen and production of hydrogen through reduction of protons. New studies focus on approaches to reduction of nitrogen to ammonia.
  • Research interests include synthetic, kinetic, and mechanistic aspects of transition metal organometallic complexes and their use as homogeneous catalysts. Much of his work focuses on the reactivity of metal hydrides, and the factors that influence the cleavage of the M-H bond as a proton, a hydride, or a hydrogen atom.
  • He and his co-workers have been interested for many years in the development of catalysts based on abundant, inexpensive metals as alternatives to the widespread use of precious metals ("Cheap Metals for Noble Tasks"). They have developed homogeneous hydrogenation catalysts that are based on molybdenum or tungsten. These catalysts function through an ionic hydrogenation mechanism, in which H2 is added to the C=O bond of a ketone by H+ transfer from a cationic dihydride complex, followed by H- transfer from a neutral metal hydride. Related interests include development of new catalysts for hydrosilylation, use of alternative resources as feedstock, and readily recyclable catalysts.
  • In addition to these studies that focus on heterolytic bond cleavage pathways (proton and hydride transfers), studies are also being carried out on fundamental aspects of homolytic bond cleavage reactions. While metal-to-carbon hydrogen atom transfers are well-known, few studies have focused on the opposite reaction, carbon-to-metal hydrogen atom transfer. We have discovered examples in which such reactions can be directly observed by time-resolved infrared spectroscopy. Our studies seek to address fundamental questions about the thermodynamics and kinetics of these reactions.

Education and Credentials

  • B.S., Chemistry, University of North Carolina at Chapel Hill, 1979
  • Ph.D., Chemistry, University of Wisconsin-Madison, 1984 (Chuck Casey's group)
  • Postdoctoral Research Associate with Prof. Jack Norton at Colorado State University (1984-1985)

Awards and Recognitions

  • Member of the Editorial Advisory Board (2005-2007) for the American Chemical Society journal Inorganic Chemistry, and a member of the Editorial Advisory Board (2000-2002) for the American Chemical Society journal Organometallics.
  • Chairman of the Gordon Conference on Organometallic Chemistry in 2003. Organizer of two symposia at American Chemical Society meetings.
  • Received the Science and Technology Award in 2002 from Brookhaven Science Associates.
  • Editor of Catalysis Without Precious Metals, 2010.
  • American Chemical Society Fellow, 2012
  • Royal Society of Chemistry Homogeneous Catalysis Award, 2013
  • Fellow of the Royal Society of Chemistry, 2013
  • 2015 ACS Catalysis Lectureship for the Advancement of Catalytic Science, (shared honor with Daniel DuBois and the PNNL Hydrogen Catalysis Team)

PNNL Publications

2018

  • Chambers G.M., E.S. Wiedner, and R.M. Bullock. 2018. "H2 Oxidation Electrocatalysis Enabled by Metal-to-Metal Hydrogen Atom Transfer: A Homolytic Approach to a Heterolytic Reaction." Angewandte Chemie International Edition 57, no. 41:13523-13527. PNNL-SA-131196. doi:10.1002/anie.201807510

2014

  • Bullock R.M., A.M. Appel, and M.L. Helm. 2014. "Production of Hydrogen by Electrocatalysis: Making the H-H Bond by Combining Protons and Hydrides." Chemical Communications 50, no. 24:3125-3143. PNNL-SA-97704. doi:10.1039/c3cc46135a
  • Chen S., M. Ho, R.M. Bullock, D.L. DuBois, M. Dupuis, R.J. Rousseau, and S. Raugei. 2014. "Computing Free Energy Landscapes: Application to Ni-based Electrocatalysts with Pendant Amines for H2 Production and Oxidation." ACS Catalysis 4, no. 1:229-242. PNNL-SA-98868. doi:10.1021/cs401104w
  • Darmon J.M., S. Raugei, T.L. Liu, E.B. Hulley, C.J. Weiss, R.M. Bullock, and M.L. Helm. 2014. "Iron Complexes for the Electrocatalytic Oxidation of Hydrogen: Tuning Primary and Secondary Coordination Spheres." ACS Catalysis 4, no. 4:1246-1260. PNNL-SA-100586. doi:10.1021/cs500290w
  • Das P., M. Ho, M.J. O'Hagan, W.J. Shaw, R.M. Bullock, S. Raugei, and M.L. Helm. 2014. "Controlling Proton Movement: Electrocatalytic Oxidation of Hydrogen by a Nickel(II) Complex Containing Proton Relays in the Second and Outer Coordination Spheres." Dalton Transactions 43, no. 7:2744-2754. PNNL-SA-99116. doi:10.1039/c3dt53074d
  • Heiden Z.M., S. Chen, L. Labios, R.M. Bullock, E.D. Walter, E.L. Tyson, and M.T. Mock. 2014. "Proton and Electron Additions to Iron (II) Dinitrogen Complexes Containing Pendant Amines." Organometallics 33, no. 6:1333-1336. PNNL-SA-97307. doi:10.1021/om401089d
  • Hou J., M. Fang, A.J. Cardenas, W.J. Shaw, M.L. Helm, R.M. Bullock, and J.A. Roberts, et al. 2014. "Electrocatalytic H2 production with a turnover frequency >107 s-1: The medium provides an increase in rate but not overpotential." Energy and Environmental Science 7, no. 12:4013 - 4017. PNNL-SA-103498. doi:10.1039/c4ee01899k
  • Hulley E.B., M.L. Helm, and R.M. Bullock. 2014. "Heterolytic Cleavage of H2 by Bifunctional Manganese(I) Complexes: Impact of Ligand Dynamics, Electrophilicity, and Base Positioning." Chemical Science 5, no. 12:4729-4741. PNNL-SA-103386. doi:10.1039/c4sc01801j
  • Laws D.R., R.M. Bullock, R. Lee, K. Huang, and W.J. Geiger. 2014. "Comparison of the One-electron Oxidations of CO-Bridged vs Unbridged Bimetallic Complexes: Electron-transfer Chemistry of Os2Cp2(CO)4 and Os2Cp*2(µ-CO)2(CO)2 (Cp = ?5-C5H5, Cp* = ?5-C5Me5)." Organometallics 33, no. 18:4716-4728. PNNL-SA-100195. doi:10.1021/om401213y
  • Lercher J.A., A.M. Appel, T. Autrey, R.M. Bullock, D.M. Camaioni, H.M. Cho, and D.A. Dixon, et al. 2014. "Multifunctional Catalysts to Synthesize and Utilize Energy Carriers." In Frontiers at the Interface between Homogeneous and Heterogeneous Catalysis, II, 207-219. Washington, District Of Columbia:U.S. Department of Energy, Office of Science. PNNL-SA-103068.
  • Lewandowska-Androlojc A., D.C. Grills, J. Zhang, R.M. Bullock, A. Miyazawa, Y. Kawanishi, and E. Fujita. 2014. "Kinetic and Mechanistic Studies of Carbon-to-Metal Hydrogen Atom Transfer Involving Os-Centered Radicals: Evidence for Tunneling." Journal of the American Chemical Society 135, no. 9:3572-3578. PNNL-SA-99794. doi:10.1021/ja4123076
  • Liu T.L., M. Rakowski DuBois, D.L. DuBois, and R.M. Bullock. 2014. "Electrochemical Oxidation of H2 Catalyzed by Ruthenium Hydride Complexes Bearing P2N2 Ligands With Pendant Amines as Proton Relays." Energy and Environmental Science 7, no. 11:3630-3639. PNNL-SA-101826. doi:10.1039/C4EE01262C
  • Liu T.L., X. Wang, C. Hoffmann, D.L. DuBois, and R.M. Bullock. 2014. "Heterolytic Cleavage of Hydrogen by an Iron Hydrogenase Model: An Fe-H - - - H-N Dihydrogen Bond Characterized by Neutron Diffraction." Angewandte Chemie International Edition 53, no. 21:5300-5304. PNNL-SA-99391. doi:10.1002/anie.201402090
  • Weiss C.J., J.D. Egbert, S. Chen, M.L. Helm, R.M. Bullock, and M.T. Mock. 2014. "Protonation Studies of a Tungsten Dinitrogen Complex Supported by a Diphosphine Ligand Containing a Pendant Amine." Organometallics 33, no. 9:21859-2200. PNNL-SA-99401. doi:10.1021/om401127v

2013

  • Bullock R.M. 2013. "Abundant Metals Give Precious Hydrogenation Performance." Science 342, no. 6162:1054-1055. PNNL-SA-99146. doi:10.1126/science.1247240
  • Das A.K., M.H. Engelhard, F. Liu, R.M. Bullock, and J.A. Roberts. 2013. "The Electrode as Organolithium Reagent: Catalyst-Free Covalent Attachment of Electrochemically Active Species to an Azide-Terminated Glassy Carbon Electrode Surface." Inorganic Chemistry 52, no. 23:13674-13684. PNNL-SA-97311. doi:10.1021/ic402247n
  • Franz J.A., M.J. O'Hagan, M. Ho, T.L. Liu, M.L. Helm, S. Lense, and D.L. DuBois, et al. 2013. "Conformational Dynamics and Proton Relay Positioning in Nickel Catalysts for Hydrogen Production and Oxidation." Organometallics 32, no. 23:7034-7042. PNNL-SA-97203. doi:10.1021/om400695w
  • Heiden Z.M., S. Chen, M.T. Mock, W.G. Dougherty, W.S. Kassel, R.J. Rousseau, and R.M. Bullock. 2013. "Protonation of Ferrous Dinitrogen Complexes Containing a Diphosphine Ligand with a Pendant Amine." Inorganic Chemistry 52, no. 7:4026-4039. PNNL-SA-92776. doi:10.1021/ic4000704
  • Ho M., S. Chen, R.J. Rousseau, M. Dupuis, R.M. Bullock, and S. Raugei. 2013. "Bio-Inspired Molecular Catalysts for Hydrogen Oxidation and Hydrogen Production." In Application of Molecular Modeling to Challenges in Clean Energy. ACS Symposium Series, edited by G Fitzgerald and N Govind. 89-111. Washington, District Of Columbia:American Chemical Society. PNNL-SA-92715.
  • Ho M., S. Raugei, R.J. Rousseau, M. Dupuis, and R.M. Bullock. 2013. "Evaluation of the Role of Water in the H2 Bond Formation by Ni(II)-based Electrocatalysts." Journal of Chemical Theory and Computation 9, no. 8:3505-3514. PNNL-SA-95935. doi:10.1021/ct400396s
  • Hoffert W.A., J.A. Roberts, R.M. Bullock, and M.L. Helm. 2013. "Production of H2 at Fast Rates Using a Nickel Electrocatalyst in Water/Acetonitrile Solutions." Chemical Communications 49, no. 71:7767-7769. PNNL-SA-94210. doi:10.1039/c3cc43203c
  • Hulley E.B., K.D. Welch, A.M. Appel, D.L. DuBois, and R.M. Bullock. 2013. "Rapid, Reversible Heterolytic Cleavage of Bound H2." Journal of the American Chemical Society 135, no. 32:11736-11739. PNNL-SA-94418. doi:10.1021/ja405755j
  • Liu T.L., D.L. DuBois, and R.M. Bullock. 2013. "An iron complex with pendant amines as a molecular electrocatalyst for oxidation of hydrogen." Nature Chemistry 5, no. 3:228-233. PNNL-SA-88258. doi:10.1038/NCHEM.1571
  • Mock M.T., S. Chen, M.J. O'Hagan, R.J. Rousseau, W.G. Dougherty, W.S. Kassel, and R.M. Bullock. 2013. "Dinitrogen Reduction by a Chromium(0) Complex Supported by a 16-membered Phosphorus Macrocycle." Journal of the American Chemical Society 135, no. 31:11493-11496. PNNL-SA-95191. doi:10.1021/ja405668u
  • Roberts J.A., and R.M. Bullock. 2013. "Direct Determination of Equilibrium Potentials for Hydrogen Oxidation/Production by Open Circuit Potential Measurements in Acetonitrile." Inorganic Chemistry 52, no. 7:3825-3835. PNNL-SA-92041. doi:10.1021/ic302461q
  • Stewart M.P., M. Ho, S. Wiese, M.L. Lindstrom, C.E. Thogerson, S. Raugei, and R.M. Bullock, et al. 2013. "High Catalytic Rates for Hydrogen Production Using Nickel Electrocatalysts with Seven-Membered Diphosphine Ligands Containing One Pendent Amine." Journal of the American Chemical Society 135, no. 16:6033-6046. PNNL-SA-92846. doi:10.1021/ja400181a
  • van der Eide E.F., G. Hou, S. Deng, H. Wen, P. Yang, R.M. Bullock, and X.B. Wang. 2013. "Metal-Centered 17-Electron Radicals CpM(CO)3· (M = Cr, Mo, W): A Combined Negative Ion Photoelectron Spectroscopic and Theoretical Study." Organometallics 32, no. 7:2084-2091. PNNL-SA-91192. doi:10.1021/om3011454
  • van der Eide E.F., M.L. Helm, E.D. Walter, and R.M. Bullock. 2013. "Structural and Spectroscopic Characterization of 17- and 18-Electron Piano-Stool Complexes of Chromium. Thermochemical Analyses of Weak Cr-H Bonds." Inorganic Chemistry 52, no. 3:1591-1603. PNNL-SA-91915. doi:10.1021/ic302460y
  • van der Eide E.F., P. Yang, and R.M. Bullock. 2013. "Isolation of Two Agostic Isomers of an Organometallic Cation: Different Structures and Colors." Angewandte Chemie International Edition 52, no. 39:10190-10194. PNNL-SA-95582. doi:10.1002/anie.201305032
  • Wiedner E.S., A.M. Appel, D.L. DuBois, and R.M. Bullock. 2013. "Thermochemical and Mechanistic Studies of Electrocatalytic Hydrogen Production by Cobalt Complexes Containing Pendant Amines." Inorganic Chemistry 52, no. 24:14391-14403. PNNL-SA-98467. doi:10.1021/ic4025475
  • Wiedner E.S., J.A. Roberts, W.G. Dougherty, W.S. Kassel, D.L. DuBois, and R.M. Bullock. 2013. "Synthesis and Electrochemical Studies of Cobalt(III) Monohydride Complexes Containing Pendant Amines." Inorganic Chemistry 52, no. 17:9975-9988. PNNL-SA-95739. doi:10.1021/ic401232g
  • Yang J.Y., S.E. Smith, T.L. Liu, W.G. Dougherty, W.A. Hoffert, W.S. Kassel, and M. Rakowski DuBois, et al. 2013. "Two Pathways for Electrocatalytic Oxidation of Hydrogen by a Nickel Bis(diphosphine) Complex with Pendant Amines in the Second Coordination Sphere." Journal of the American Chemical Society 135, no. 26:9700-9712. PNNL-SA-92342. doi:10.1021/ja400705a

2012

  • Liu T.L., S. Chen, M.J. O'Hagan, M. Rakowski DuBois, R.M. Bullock, and D.L. DuBois. 2012. "Synthesis, Characterization and Reactivity of Fe Complexes Containing Cyclic Diazadiphosphine Ligands: The Role of the Pendant Base in Heterolytic Cleavage of H2." Journal of the American Chemical Society 134, no. 14:6257-6272. PNNL-SA-84310. doi:10.1021/ja211193j
  • O'Hagan M.J., M. Ho, J.Y. Yang, A.M. Appel, M. Rakowski DuBois, S. Raugei, and W.J. Shaw, et al. 2012. "Proton Delivery and Removal in [Ni(PR2NR'2)2]2+ Hydrogen Production and Oxidation Catalysts." Journal of the American Chemical Society 134, no. 47:19409-19424. PNNL-SA-88737. doi:10.1021/ja307413x
  • Pool D.H., M.P. Stewart, M.J. O'Hagan, W.J. Shaw, J.A. Roberts, R.M. Bullock, and D.L. DuBois. 2012. "Acidic Ionic Liquid/Water Solution as Both Medium and Proton Source for Electrocatalytic H2 Evolution by [Ni(P2N2)2]2+ Complexes." Proceedings of the National Academy of Sciences of the United States of America 109, no. 39:15634-15639. PNNL-SA-84646. doi:10.1073/pnas.1120208109
  • Raugei S., S. Chen, M. Ho, B. Ginovska-Pangovska, R.J. Rousseau, M. Dupuis, and D.L. DuBois, et al. 2012. "The Role of Pendant Amines in the Breaking and Forming of Molecular Hydrogen Catalyzed by Nickel Complexes." Chemistry - A European Journal 18, no. 21:6493-6506. PNNL-SA-83517. doi:10.1002/chem.201103346
  • Smith S.E., J.Y. Yang, D.L. DuBois, and R.M. Bullock. 2012. "Reversible Electrocatalytic Production and Oxidation of Hydrogen at Low Overpotentials by a Functional Hydrogenase Mimic." Angewandte Chemie International Edition 51, no. 13:3152-3155. PNNL-SA-84487. doi:10.1002/anie.201108461
  • van der Eide E.F., P. Yang, E.D. Walter, T.L. Liu, and R.M. Bullock. 2012. "Dinuclear Metalloradicals Featuring Unsupported Metal-Metal Bonds." Angewandte Chemie International Edition 51, no. 33:8361-8364. PNNL-SA-87602. doi:10.1002/anie.201203531
  • van der Eide E.F., T.L. Liu, D.M. Camaioni, E.D. Walter, and R.M. Bullock. 2012. "Facile Thermal W-W Bond Homolysis in the N-Heterocyclic Carbene-Containing Tungsten Dimer [CpW(CO)2(IMe)]2." Organometallics 31, no. 5:1775-1789. PNNL-SA-84309. doi:10.1021/om201162g
  • Weiss C.J., A.N. Groves, M.T. Mock, W.G. Dougherty, W.S. Kassel, M.L. Helm, and D.L. DuBois, et al. 2012. "Synthesis and reactivity of molybdenum and tungsten bis(dinitrogen) complexes supported by diphosphine chelates containing pendant amines." Dalton Transactions 41, no. 15:4517-4529. PNNL-SA-84204. doi:10.1039/C2DT12224C
  • Wiedner E.S., J.Y. Yang, S. Chen, S. Raugei, W.G. Dougherty, W.S. Kassel, and M.L. Helm, et al. 2012. "Stabilization of Nickel Complexes with Ni0···H-N Bonding Interactions Using Sterically Demanding Cyclic Diphosphine Ligands." Organometallics 31, no. 1:144-156. PNNL-SA-81603. doi:10.1021/om200709z
  • Wiese S., U.J. Kilgore, D.L. DuBois, and R.M. Bullock. 2012. "[Ni(PMe2NPh2)2](BF4)2 as an Electrocatalyst for H2 Production." ACS Catalysis 2, no. 5:720-727. PNNL-SA-85032. doi:10.1021/cs300019h

2011

  • Appel A.M., D.H. Pool, M.J. O'Hagan, W.J. Shaw, J.Y. Yang, M. Rakowski DuBois, and D.L. DuBois, et al. 2011. "[Ni(PPh2NBn2)2(CH3CN)]2+ as an Electrocatalyst for H2 Production: Dependence on Acid Strength and Isomer Distribution." ACS Catalysis 1, no. 7:777-785. PNNL-SA-77921. doi:10.1021/cs2000939
  • Bullock R.M. 2011. "A Mercurial Route to a Cobalt Dihydrogen Complex." Angewandte Chemie International Edition 50, no. 18:4050-4052. PNNL-SA-76096. doi:10.1002/anie.201006731
  • Chen S., R.J. Rousseau, S. Raugei, M. Dupuis, D.L. DuBois, and R.M. Bullock. 2011. "Comprehensive Thermodynamics of Nickel Hydride Bis(Diphosphine) Complexes: A Predictive Model through Computations." Organometallics 30, no. 22:6108-6118. PNNL-SA-81337. doi:10.1021/om200645x
  • DuBois D.L., and R.M. Bullock. 2011. "Molecular Electrocatalysts for the Oxidation of Hydrogen and the Production of Hydrogen - The Role of Pendant Amines as Proton Relays." European Journal of Inorganic Chemistry 2011, no. 7:1017-1027. PNNL-SA-75690. doi:10.1002/ejic.201001081
  • Dupuis M., S. Chen, S. Raugei, D.L. DuBois, and R.M. Bullock. 2011. "Comment on 'New Insights in the Electrocatalytic Proton Reduction and Hydrogen Oxidation by Bioinspired Catalysts: A DFT Investigation'." Journal of Physical Chemistry A 115, no. 18:4861-4865. PNNL-SA-76591. doi:10.1021/jp111479z
  • Helm M.L., M.P. Stewart, R.M. Bullock, M. Rakowski DuBois, and D.L. DuBois. 2011. "A Synthetic Nickel Electrocatalyst With a Turnover Frequency Above 100,000 s-1 for H2 Production." Science 333, no. 6044:863-866. PNNL-SA-78670. doi:10.1126/science.1205864
  • Kilgore U.J., J.A. Roberts, D.H. Pool, A.M. Appel, M.P. Stewart, M. Rakowski DuBois, and W.G. Dougherty, et al. 2011. "[Ni(PPh2NC6H4X2)2]2+ Complexes as Electrocatalysts for H2 Production: Effect of Substituents, Acids, and Water on Catalytic Rates." Journal of the American Chemical Society 133, no. 15:5861-5872. PNNL-SA-76108. doi:10.1021/ja109755f
  • Kilgore U.J., M.P. Stewart, M.L. Helm, W.G. Dougherty, W.S. Kassel, M. Rakowski DuBois, and D.L. DuBois, et al. 2011. "Studies of a Series of [Ni(PR2NPh2)2(CH3CN)]2+ Complexes as Electrocatalysts for H2 Production: Substituent Variation at the Phosphorus Atom of the P2N2 Ligand." Inorganic Chemistry 50, no. 21:10908-10918. PNNL-SA-81181.
  • Mock M.T., S. Chen, R.J. Rousseau, M.J. O'Hagan, W.G. Dougherty, W.S. Kassel, and D.L. DuBois, et al. 2011. "A Rare Terminal Dinitrogen Complex of Chromium." Chemical Communications 47, no. 44:12212-12214. PNNL-SA-79701. doi:10.1039/C1CC15430C
  • O'Hagan M.J., W.J. Shaw, S. Raugei, S. Chen, J.Y. Yang, U.J. Kilgore, and D.L. DuBois, et al. 2011. "Moving Protons with Pendant Amines: Proton Mobility in a Nickel Catalyst for Oxidation of Hydrogen." Journal of the American Chemical Society 133, no. 36:14301-14312. PNNL-SA-77814. doi:10.1021/ja201838x
  • Roberts J.A., A.M. Appel, D.L. DuBois, and R.M. Bullock. 2011. "Comprehensive Thermochemistry of W-H Bonding in the Metal Hydrides CpW(CO)2(IMes)H, [CpW(CO)2(IMes)H]·+, and [CpW(CO)2(IMes)(H)2]+. Influence of an N-Heterocyclic Carbene Ligand on Metal Hydride Bond Energies." Journal of the American Chemical Society 133, no. 37:14604-14613. PNNL-SA-78855. doi:10.1021/ja202830w
  • Roberts J.A., D.L. DuBois, and R.M. Bullock. 2011. "Experimental and Digital Modeling Studies of the Electrochemical Oxidation of the Metal Anion [CpW(CO)2(IMes)]- and the 17-Electron Metal Radical CpW(CO)2(IMes)·. Kinetics and Thermodynamics of Capture and Release of MeCN by a Metal Radical and a Metal Cation." Organometallics 30, no. 17:4555-4563. PNNL-SA-78755. doi:10.1021/om2002816
  • Roberts J.A., J.A. Franz, E.F. van der Eide, E.D. Walter, J.L. Petersen, D.L. DuBois, and R.M. Bullock. 2011. "Comproportionation of Cationic and Anionic Tungsten Complexes Having an N-Heterocyclic Carbene Ligand to Give the Isolable 17-Electron Tungsten Radical, CpW(CO)2(IMes)·." Journal of the American Chemical Society 133, no. 37:14593-14603. PNNL-SA-78754. doi:10.1021/ja202754e
  • Yang J.Y., R.M. Bullock, M. Rakowski DuBois, and D.L. DuBois. 2011. "Fast and efficient molecular electrocatalysts for H2 production: Using hydrogenase enzymes as guides." MRS Bulletin 36, no. 1:39-47. PNNL-SA-75088. doi:10.1557/mrs.2010.8

2010

  • Bullock R.M. 2010. "Molybdenum and Tungsten Catalysts for Hydrogenation, Hydrosilylation and Hydrolysis." In Catalysis Without Precious Metals, edited by RM Bullock. 51-81. Hoboken, New Jersey:John Wiley & Sons, Inc. PNNL-SA-68550.
  • Bullock R.M. 2010. Catalysis Without Precious Metals. Hoboken, New Jersey:John Wiley & Sons, Inc. PNNL-SA-76174.
  • Chen S., S. Raugei, R.J. Rousseau, M. Dupuis, and R.M. Bullock. 2010. "Homogeneous Ni catalysts for H2 Oxidation and Production: An Assessment of Theoretical Methods, from Density Functional Theory to Post Hartree-Fock Correlated Wave-Function Theory." Journal of Physical Chemistry A 114, no. 48:12716-12724. PNNL-SA-73995. doi:10.1021/jp106800n
  • Cheng T., D.J. Szalda, J.A. Franz, and R.M. Bullock. 2010. "Structural and Computational Studies of Cp(CO)2(PCy3)MoFBF3, a Complex with a Bound BF4- Ligand." Inorganica Chimica Acta 363, no. 3:581-585. PNNL-SA-63229. doi:10.1016/j.ica.2009.02.028
  • Fagan P.J., M.H. Voges, and R.M. Bullock. 2010. "Catalytic Ionic Hydrogenation of Ketones by {[Cp*Ru(CO)2]2(? H)}+." Organometallics 29, no. 4:1045-1048. PNNL-SA-69639. doi:10.1021/om901005k
  • Welch K.D., W.G. Dougherty, W.S. Kassel, D.L. DuBois, and R.M. Bullock. 2010. "Synthesis, Structures, and Reactions of Manganese Complexes Containing Diphosphine Ligands With Pendant Amines." Organometallics 29, no. 20:4532-4540. PNNL-SA-73791. doi:10.1021/om100668e
  • Wiedner E.S., J.Y. Yang, W.G. Dougherty, W.S. Kassel, R.M. Bullock, M. Rakowski DuBois, and D.L. DuBois. 2010. "Comparison of Cobalt and Nickel Complexes with Sterically Demanding Cyclic Diphosphine Ligands: Electrocatalytic H2 Production by [Co(PtBu2NPh2)(CH3CN)3](BF4)2." Organometallics 29, no. 21:5390-5401. PNNL-SA-72956. doi:10.1021/om100395r
  • Yang J.Y., R.M. Bullock, W.G. Dougherty, W.S. Kassel, B. Twamley, D.L. DuBois, and M. Rakowski DuBois. 2010. "Reduction of Oxygen Catalyzed by Nickel Diphosphine Complexes with Positioned Pendant Amines." Dalton Transactions 39, no. 12:3001-3010. PNNL-SA-68965.
  • Yang J.Y., S. Chen, W.G. Dougherty, W.S. Kassel, R.M. Bullock, D.L. DuBois, and S. Raugei, et al. 2010. "Hydrogen Oxidation Catalysis by a Nickel Diphosphine Complex with Pendant tert-Butyl Amines." Chemical Communications 46. PNNL-SA-74657. doi:10.1039/C0CC03246H

2009

  • Ghosh P., P.J. Fagan, W.J. Marshall, W.J. Marshall, E. Hauptman, and R.M. Bullock. 2009. "Synthesis of Ruthenium Carbonyl Complexes with Phosphine or Substituted Cp Ligands, and Their Activity in the Catalytic Deoxygenation of 1,2-Propanediol." Inorganic Chemistry 48, no. 14:6490-6500. PNNL-SA-63877. doi:10.1021/ic900413y
  • Schlaf M., P. Ghosh, P.J. Fagan, E. Hauptman, and R.M. Bullock. 2009. "Catalytic Deoxygenation of 1,2-Propanediol to Give n-Propanol." Advanced Synthesis & Catalysis 351, no. 5:789-800. PNNL-SA-62197.
  • Yang J.Y., R.M. Bullock, W.J. Shaw, B. Twamley, K. Fraze, K. Fraze, and M. Rakowski DuBois, et al. 2009. "Mechanistic Insights into Catalytic H2 Oxidation by Ni Complexes Containing a Diphosphine Ligand with a Positioned Amine Base." Journal of the American Chemical Society 131, no. 16:5935-5945. PNNL-SA-64310.

2008

  • Cheng T., D.J. Szalda, J.C. Hanson, J.T. Muckerman, and R.M. Bullock. 2008. "Four-Electron Donor Hemilabile n3-PPh3 Ligand that Binds Through a C = C Bond Rather than an Agostic C-H Interaction, and Displacement of the C = C by Methyl Iodide or Water." Organometallics 27, no. 15:3785-3795. PNNL-SA-59787. doi:10.1021/om800401d
  • Jacobsen G.M., J.Y. Yang, B. Twamley, A. Wilson, A. Wilson, R.M. Bullock, and M. Rakowski DuBois, et al. 2008. "Hydrogen Production Using Cobalt-Based Molecular Catalysts Containing a Proton Relay in the Second Coordination Sphere." Energy & Environmental Science 1, no. 1:167-174. PNNL-SA-59889. doi:10.1039/b805309j

2007

  • Bullock R.M. 2007. "An Iron Catalyst for Ketone Hydrogenations Under Mild Conditions." Angewandte Chemie International Edition 46, no. 39:7360-7363. PNNL-SA-56110. doi:10.1002/anie.200703053
  • Egbert J.D., R.M. Bullock, and D.M. Heinekey. 2007. "Cationic Dihydrogen/Dihydride Complexes of Osmium: Structure and Dynamics." Organometallics 26, no. 9:2291-2295. PNNL-SA-53600. doi:10.1021/om0700718
  • Wu F., V.K. Dioumaev, D.J. Szalda, J. Hanson, and R.M. Bullock. 2007. "A Tungsten Complex with a Bidentate, Hemilabile N-Heterocyclic Carbene Ligand, Facile Displacement of the Weakly Bound W-(C=C) Bond, and the Vulnerability of the NHC Ligand Toward Catalyst Deactivation During Ketone Hydrogenation." Organometallics 26, no. 20:5079-5090. PNNL-SA-55012. doi:10.1021/om700694e

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