1
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Paenurk E, Chen P. Modeling Gas-Phase Unimolecular Dissociation for Bond Dissociation Energies: Comparison of Statistical Rate Models within RRKM Theory. J Phys Chem A 2021; 125:1927-1940. [PMID: 33635061 DOI: 10.1021/acs.jpca.1c00183] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The Rice-Ramsperger-Kassel-Marcus (RRKM) theory provides a simple yet powerful rate theory for calculating microcanonical rate constants. In particular, it has found widespread use in combination with gas-phase kinetic experiments of unimolecular dissociations to extract experimental bond dissociation energies (BDEs). We have previously found several discrepancies between the computed BDE values and the respective experimental ones, obtained with our empirical rate model, named L-CID. To investigate the reliability of our rate model, we conducted a theoretical analysis and comparison of the performance of conventional rate models and L-CID within the RRKM framework. Using the previously published microcanonical rate data as well as reaction cross-section data, we show that the BDE values obtained with the L-CID model agree with the ones from the other rate models within the expected uncertainty bounds. Based on this agreement, we discuss the possible rationalization of the good performance of the L-CID model.
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Affiliation(s)
- Eno Paenurk
- Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland
| | - Peter Chen
- Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland
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2
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Bot M, Gorbachev V, Tsybizova A, Chen P. Bond Dissociation Energies in the Gas Phase for Large Molecular Ions by Threshold Collision-Induced Dissociation Experiments: Stretching the Limits. J Phys Chem A 2020; 124:8692-8707. [PMID: 32955888 DOI: 10.1021/acs.jpca.0c05712] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Accurate bond dissociation energies for large molecules are difficult to obtain by either experimental or computational methods. The former methods are hampered by a range of physical and practical limitations in gas-phase measurement techniques, while the latter require incorporation of multiple approximations whose impact on accuracy may not always be clear. When internal benchmarks are not available, one hopes that experiment and theory can mutually support each other. A recent report found, however, a large discrepancy between gas-phase bond dissociation energies, measured mass spectrometrically, and the corresponding quantities computed using density functional theory (DFT)-D3 and DLPNO-CCSD(T) methods. With the widespread application of these computational methods to large molecular systems, the discrepancy needs to be resolved. We report a series of experimental studies that validate the mass spectrometric methods from small to large ions and find that bond dissociation energies extracted from threshold collision-induced dissociation experiments on large ions do indeed behave correctly. The implications for the computational studies are discussed.
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Affiliation(s)
- Marek Bot
- Laboratorium für Organische Chemie, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zürich, Switzerland
| | - Vladimir Gorbachev
- Laboratorium für Organische Chemie, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zürich, Switzerland
| | - Alexandra Tsybizova
- Laboratorium für Organische Chemie, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zürich, Switzerland
| | - Peter Chen
- Laboratorium für Organische Chemie, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zürich, Switzerland
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3
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Tsybizova A, Fritsche L, Gorbachev V, Miloglyadova L, Chen P. Cryogenic ion vibrational predissociation (CIVP) spectroscopy of a gas-phase molecular torsion balance to probe London dispersion forces in large molecules. J Chem Phys 2019; 151:234304. [DOI: 10.1063/1.5124227] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Affiliation(s)
| | - Lukas Fritsche
- Laboratorium für Organische Chemie, ETH Zürich, Zürich, Switzerland
| | | | | | - Peter Chen
- Laboratorium für Organische Chemie, ETH Zürich, Zürich, Switzerland
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4
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Corinti D, Crestoni ME, Fornarini S, Ponte F, Russo N, Sicilia E, Gabano E, Osella D. Elusive Intermediates in the Breakdown Reactivity Patterns of Prodrug Platinum(IV) Complexes. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:1881-1894. [PMID: 30980381 DOI: 10.1007/s13361-019-02186-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 03/01/2019] [Accepted: 03/05/2019] [Indexed: 06/09/2023]
Abstract
Kinetically inert platinum(IV) complexes are receiving growing attention as promising candidates in the effort to develop safe and valid alternatives to classical square-planar Pt(II) complexes currently used in antineoplastic therapy. Their antiproliferative activity requires intracellular Pt(IV)-Pt(II) reduction (activation by reduction). In the present work, a set of five Pt(IV) complexes has been assayed using mass spectrometry-based techniques, i.e., collision-induced dissociation (CID), and IR multiple photon dissociation (IRMPD) spectroscopy, together with ab initio theoretical investigations. Breakdown and reduction mechanisms are observed that lead to Pt(II) species. Evidence is found for typically transient Pt(III) intermediates along the dissociation paths of isolated, negatively charged (electron-rich) Pt(IV) prodrug complexes.
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Affiliation(s)
- Davide Corinti
- Dipartimento di Chimica e Tecnologie del Farmaco, Università di Roma "La Sapienza", P.le A. Moro 5, 00185, Rome, Italy
| | - Maria Elisa Crestoni
- Dipartimento di Chimica e Tecnologie del Farmaco, Università di Roma "La Sapienza", P.le A. Moro 5, 00185, Rome, Italy
| | - Simonetta Fornarini
- Dipartimento di Chimica e Tecnologie del Farmaco, Università di Roma "La Sapienza", P.le A. Moro 5, 00185, Rome, Italy.
| | - Fortuna Ponte
- Department of Chemistry and Chemical Technologies, Università della Calabria, Ponte P. Bucci Cubo 14c, 87036, Arcavacata di Rende, Italy
| | - Nino Russo
- Department of Chemistry and Chemical Technologies, Università della Calabria, Ponte P. Bucci Cubo 14c, 87036, Arcavacata di Rende, Italy
| | - Emilia Sicilia
- Department of Chemistry and Chemical Technologies, Università della Calabria, Ponte P. Bucci Cubo 14c, 87036, Arcavacata di Rende, Italy.
| | - Elisabetta Gabano
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Viale T. Michel 11, 15121, Alessandria, Italy
| | - Domenico Osella
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Viale T. Michel 11, 15121, Alessandria, Italy.
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5
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Yu JL, Zhang SQ, Hong X. Stepwise versus Concerted Reductive Elimination Mechanisms in the Carbon–Iodide Bond Formation of (DPEphos)RhMeI2 Complex. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00723] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jing-Lu Yu
- Department of Chemistry, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Shuo-Qing Zhang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Xin Hong
- Department of Chemistry, Zhejiang University, Hangzhou 310027, People’s Republic of China
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6
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Parchomyk T, Koszinowski K. Electronic and Steric Effects on the Reductive Elimination of Anionic Arylferrate(III) Complexes. Chemistry 2018; 24:16342-16347. [PMID: 29969518 DOI: 10.1002/chem.201801003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Indexed: 11/11/2022]
Abstract
Arylferrate(III) complexes Ph3 FeR- (R=para- and ortho-substituted aryl) are proposed as model systems for the in-depth investigation of reductive eliminations from organoiron(III) species. Electrospray ionization transfers the arylferrate complexes prepared in situ from solution into the gas phase, where mass selection ensures a well-defined population of reactant ions. Upon gas-phase fragmentation, the arylferrate complexes undergo reductive elimination of the cross-coupling product PhR as well as the homo-coupling product Ph2 . The measured branching ratios between the two competing reaction channels are used to construct a Hammett plot, which shows that electron-donating aryl groups R favor the formation of the cross-coupling product. In this way, the complexes avoid the build-up of too much electron density at the iron center during the reductive elimination. ortho Substitution in R increases the fraction of the homo-coupling product, presumably by hindering the approach between the two aryl groups participating in the reductive elimination. The obtained mechanistic insight substantially advances our understanding of one of the central elementary steps of transition-metal-catalyzed cross-coupling reactions.
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Affiliation(s)
- Tobias Parchomyk
- Institut für Organische und Biomolekulare Chemie, Universität Göttingen, Tammannstr. 2, 37077, Göttingen, Germany
| | - Konrad Koszinowski
- Institut für Organische und Biomolekulare Chemie, Universität Göttingen, Tammannstr. 2, 37077, Göttingen, Germany
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7
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Weske S, Hardin RA, Auth T, O'Hair RAJ, Koszinowski K, Ogle CA. Argentate(i) and (iii) complexes as intermediates in silver-mediated cross-coupling reactions. Chem Commun (Camb) 2018; 54:5086-5089. [PMID: 29708564 DOI: 10.1039/c8cc01707g] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Despite the potential of silver to mediate synthetically valuable cross-coupling reactions, the operating mechanisms have remained unknown. Here, we use a combination of rapid-injection NMR spectroscopy, electrospray-ionization mass spectrometry, and quantum chemical calculations to demonstrate that these transformations involve argentate(i) and (iii) complexes as key intermediates.
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Affiliation(s)
- Sebastian Weske
- Institut für Organische und Biomolekulare Chemie, Universität Göttingen, Tammannstraße 2, 37077 Göttingen, Germany.
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8
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Husch T, Freitag L, Reiher M. Calculation of Ligand Dissociation Energies in Large Transition-Metal Complexes. J Chem Theory Comput 2018; 14:2456-2468. [PMID: 29595973 DOI: 10.1021/acs.jctc.8b00061] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The accurate calculation of ligand dissociation (or equivalently, ligand binding) energies is crucial for computational coordination chemistry. Despite its importance, obtaining accurate ab initio reference data is difficult, and density-functional methods of uncertain reliability are chosen for feasibility reasons. Here, we consider advanced coupled-cluster and multiconfigurational approaches to reinvestigate our WCCR10 set of 10 gas-phase ligand dissociation energies [ J. Chem. Theory Comput. 2014, 10, 3092]. We assess the potential multiconfigurational character of all molecules involved in these reactions with a multireference diagnostic [ Mol. Phys. 2017, 115, 2110] in order to determine where single-reference coupled-cluster approaches can be applied. For some reactions of the WCCR10 set, large deviations of density-functional results including semiclassical dispersion corrections from experimental reference data had been observed. This puzzling observation deserves special attention here, and we tackle the issue (i) by comparing to ab initio data that comprise dispersion effects on a rigorous first-principles footing and (ii) by a comparison of density-functional approaches that model dispersion interactions in various ways. For two reactions, species exhibiting nonnegligible static electron correlation were identified. These two reactions represent hard problems for electronic structure methods and also for multireference perturbation theories. However, most of the ligand dissociation reactions in WCCR10 do not exhibit static electron correlation effects, and hence, we may choose standard single-reference coupled-cluster approaches to compare with density-functional methods. For WCCR10, the Minnesota M06-L functional yielded the smallest mean absolute deviation of 13.2 kJ mol-1 out of all density functionals considered (PBE, BP86, BLYP, TPSS, M06-L, PBE0, B3LYP, TPSSh, and M06-2X) without additional dispersion corrections in comparison to the coupled-cluster results, and the PBE0-D3 functional produced the overall smallest mean absolute deviation of 4.3 kJ mol-1. The agreement of density-functional results with coupled-cluster data increases significantly upon inclusion of any type of dispersion correction. It is important to emphasize that different density-functional schemes available for this purpose perform equally well. The coupled-cluster dissociation energies, however, deviate from experimental results on average by 30.3 kJ mol-1. Possible reasons for these deviations are discussed.
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Affiliation(s)
- Tamara Husch
- Laboratorium für Physikalische Chemie , ETH Zürich , Vladimir-Prelog-Weg 2 , 8093 Zürich , Switzerland
| | - Leon Freitag
- Laboratorium für Physikalische Chemie , ETH Zürich , Vladimir-Prelog-Weg 2 , 8093 Zürich , Switzerland
| | - Markus Reiher
- Laboratorium für Physikalische Chemie , ETH Zürich , Vladimir-Prelog-Weg 2 , 8093 Zürich , Switzerland
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9
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Cuevas-Chávez CA, Zamora-Moreno J, Muñoz-Hernández MA, Bijani C, Sabo-Etienne S, Montiel-Palma V. Stabilization of Trans Disilyl Coordination at Square-Planar Platinum Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00566] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cynthia A. Cuevas-Chávez
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Col. Chamilpa, Cuernavaca, Morelos C. P. 62209, México
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099, F-31077 Toulouse Cedex 4, France
- Université de Toulouse, UPS, INPT, F-31077 Toulouse Cedex 4, France
| | - Julio Zamora-Moreno
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Col. Chamilpa, Cuernavaca, Morelos C. P. 62209, México
| | - Miguel A. Muñoz-Hernández
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Col. Chamilpa, Cuernavaca, Morelos C. P. 62209, México
| | - Christian Bijani
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099, F-31077 Toulouse Cedex 4, France
- Université de Toulouse, UPS, INPT, F-31077 Toulouse Cedex 4, France
| | - Sylviane Sabo-Etienne
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099, F-31077 Toulouse Cedex 4, France
- Université de Toulouse, UPS, INPT, F-31077 Toulouse Cedex 4, France
| | - Virginia Montiel-Palma
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Col. Chamilpa, Cuernavaca, Morelos C. P. 62209, México
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10
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Oeschger RJ, Chen P. Structure and Gas-Phase Thermochemistry of a Pd/Cu Complex: Studies on a Model for Transmetalation Transition States. J Am Chem Soc 2017; 139:1069-1072. [DOI: 10.1021/jacs.6b12152] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Raphael J. Oeschger
- Laboratorium für Organische
Chemie, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Peter Chen
- Laboratorium für Organische
Chemie, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
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11
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Anderson CM, Greenberg MW, Spano L, Servatius L, Tanski JM. Regioselective competition between the formation of seven-membered and five-membered cyclometalated platinacycles preceded by Csp2Csp3 reductive elimination. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.06.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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12
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Rudakov ES, Shul'pin GB. Stable organoplatinum complexes as intermediates and models in hydrocarbon functionalization. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.01.032] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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13
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Schulz J, Shcherbachenko E, Roithová J. Investigation of Geminally Diaurated Arene Complexes in the Gas Phase. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00343] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jiří Schulz
- Department of Organic Chemistry,
Faculty of Science, Charles University in Prague, Hlavova 2030/8, 12843 Prague 2, Czech Republic
| | - Elena Shcherbachenko
- Department of Organic Chemistry,
Faculty of Science, Charles University in Prague, Hlavova 2030/8, 12843 Prague 2, Czech Republic
| | - Jana Roithová
- Department of Organic Chemistry,
Faculty of Science, Charles University in Prague, Hlavova 2030/8, 12843 Prague 2, Czech Republic
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14
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Oeschger RJ, Ringger DH, Chen P. Gas-Phase Investigations on the Transmetalation Step in Sonogashira Reactions. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00491] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Raphael J. Oeschger
- Laboratorium
für Organische Chemie, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - David H. Ringger
- Laboratorium
für Organische Chemie, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Peter Chen
- Laboratorium
für Organische Chemie, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
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15
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Vikse KL, McIndoe JS. Mechanistic insights from mass spectrometry: examination of the elementary steps of catalytic reactions in the gas phase. PURE APPL CHEM 2015. [DOI: 10.1515/pac-2014-1118] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractReal-time mass spectrometric monitoring of speciation in a catalytic reaction while it is occurring provides powerful insights into mechanistic aspects of the reaction, but cannot be expected to elucidate all details. However, mass spectrometers are not limited just to analysis: they can serve as reaction vessels in their own right, and given their powers of separation and activation in the gas phase, they are also capable of generating and isolating reactive intermediates. We can use these capabilities to help fill in our overall understanding of the catalytic cycle by examining the elementary steps that make it up. This article provides examples of how these simple reactions have been examined in the gas phase.
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Affiliation(s)
- Krista L. Vikse
- 1Laboratorium für Organische Chemie, ETH Zürich, HCI G 220, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - J. Scott McIndoe
- 2Department of Chemistry, University of Victoria, P.O. Box 3065 Victoria, BC V8W3V6, Canada
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16
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Zhugralin AR, Kobylianskii IJ, Chen P. Experimental Gas-Phase and in Silico Investigation of β-Methyl Elimination from Cationic Palladium Alkyl Species. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00043] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Adil R. Zhugralin
- Laboratorium für Organische
Chemie, ETH Zürich, Vladimir-Prelog-Strasse 2, 8093 Zürich, Switzerland
| | - Ilia J. Kobylianskii
- Laboratorium für Organische
Chemie, ETH Zürich, Vladimir-Prelog-Strasse 2, 8093 Zürich, Switzerland
| | - Peter Chen
- Laboratorium für Organische
Chemie, ETH Zürich, Vladimir-Prelog-Strasse 2, 8093 Zürich, Switzerland
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17
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McCready MS, Puddephatt RJ. The Platinum Center is a Stronger Nucleophile than the Free Nitrogen Donors in a Dimethylplatinum Complex with a Dipyridylpyridazine Ligand. Organometallics 2014. [DOI: 10.1021/om501023r] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Matthew S. McCready
- Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Richard J. Puddephatt
- Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7
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18
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Ringger DH, Kobylianskii IJ, Serra D, Chen P. Quantitative Description of Structural Effects on the Stability of Gold(I) Carbenes. Chemistry 2014; 20:14270-81. [DOI: 10.1002/chem.201403988] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Indexed: 01/28/2023]
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19
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Weymuth T, Couzijn EPA, Chen P, Reiher M. New Benchmark Set of Transition-Metal Coordination Reactions for the Assessment of Density Functionals. J Chem Theory Comput 2014; 10:3092-103. [DOI: 10.1021/ct500248h] [Citation(s) in RCA: 150] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thomas Weymuth
- ETH Zürich, Laboratorium für Physikalische
Chemie, Vladimir-Prelog-Weg
2, CH-8093 Zürich, Switzerland
| | - Erik P. A. Couzijn
- ETH Zürich, Laboratorium für Organische
Chemie, Vladimir-Prelog-Weg
2, CH-8093 Zürich, Switzerland
| | - Peter Chen
- ETH Zürich, Laboratorium für Organische
Chemie, Vladimir-Prelog-Weg
2, CH-8093 Zürich, Switzerland
| | - Markus Reiher
- ETH Zürich, Laboratorium für Physikalische
Chemie, Vladimir-Prelog-Weg
2, CH-8093 Zürich, Switzerland
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