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Wicker SA, Hutchison P, Musicante RG, Kiker MT, Suffern NC, Graham DK, Rhodes LM, Binu AP, Jean-Francois SA, Graves AS, Brennessel WW, Eckenhoff WT. Hydrogen Production Using a Nickel Catalyst Combining Redox Activity and Pendent Base Effects. Inorg Chem 2024; 63:451-461. [PMID: 38113512 DOI: 10.1021/acs.inorgchem.3c03308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
With the mounting need for clean and renewable energy, catalysts for hydrogen production based on earth abundant elements are of great interest. Herein, we describe the synthesis, characterization, and catalytic activity of two nickel complexes based on the pyridinediimine ligand that possess basic nitrogen moieties of pyridine and imidazole that could potentially serve as pendent bases to enhance catalysis. Although these ligands have previously been reported to be complexed to some metal ions, they have not been applied to nickel. The nickel complex with the pendent pyridines was found to be the most active of the two, catalyzing proton reduction electrochemically with an overpotential of 490 mV. The appearance of a wave that preceded the Ni(I/0) redox couple in the presence of protons suggests that protonation of a dissociated pyridine was likely. Further evidence of this was provided with density functional theory calculations, and a mechanism of hydrogen production is proposed. Furthermore, in a light-driven system containing Ru(bpy)32+ and ascorbic acid, TON of 1400 were obtained.
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Affiliation(s)
- Scott A Wicker
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Phillips Hutchison
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Robert G Musicante
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Meghan T Kiker
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Nicholas C Suffern
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Daniel K Graham
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Liam M Rhodes
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Aby P Binu
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Stephan A Jean-Francois
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Alex S Graves
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - William W Brennessel
- Department of Chemistry, University of Rochester, 120 Trustee Road, Rochester, New York 14627, United States
| | - William T Eckenhoff
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
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2
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Synthesis, electronic structures, and reactivity of mononuclear and dinuclear low-valent molybdenum complexes in iminopyridine and bis(imino)pyridine ligand environments. J Inorg Biochem 2022; 230:111744. [DOI: 10.1016/j.jinorgbio.2022.111744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 01/18/2022] [Accepted: 01/22/2022] [Indexed: 11/22/2022]
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3
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Buss JA, Shida N, He T, Agapie T. Carbon Dioxide Reduction with Dihydrogen and Silanes at Low-Valent Molybdenum Terphenyl Diphosphine Complexes: Reductant Identity Dictates Mechanism. ACS Catal 2021. [DOI: 10.1021/acscatal.1c02922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Joshua A. Buss
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard MC 127-72, Pasadena, California 91125, United States
| | - Naoki Shida
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard MC 127-72, Pasadena, California 91125, United States
| | - Tianyi He
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard MC 127-72, Pasadena, California 91125, United States
| | - Theodor Agapie
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard MC 127-72, Pasadena, California 91125, United States
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4
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Pal R, Kim S, Lee W, Mena MR, Khurshid A, Ghosh C, Groy TL, Chizmeshya AVG, Baik MH, Trovitch RJ. Reaction of a Molybdenum Bis(dinitrogen) Complex with Carbon Dioxide: A Combined Experimental and Computational Investigation. Inorg Chem 2021; 60:7708-7718. [PMID: 34008966 DOI: 10.1021/acs.inorgchem.1c00003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Refluxing Mo(CO)6 in the presence of the phosphine-functionalized α-diimine ligand Ph2PPrDI allowed for substitution and formation of the dicarbonyl complex, (Ph2PPrDI)Mo(CO)2. Oxidation with I2 followed by heating resulted in further CO dissociation and isolation of the corresponding diiodide complex, (Ph2PPrDI)MoI2. Reduction of this complex under a N2 atmosphere afforded the corresponding bis(dinitrogen) complex, (Ph2PPrDI)Mo(N2)2. The solid-state structures of all three compounds were found to feature a tetradentate chelate and cis-monodentate ligands. Notably, the addition of CO2 to (Ph2PPrDI)Mo(N2)2 is proposed to result in head-to-tail CO2 coupling to generate the corresponding metallacycle and ultimately a mixture of (Ph2PPrDI)Mo(CO)2 and the bis(oxo) dimer, [(κ3-Ph2PPrDI)Mo(O)(μ-O)]2. Computational studies have been performed to gain insight into the reaction and evaluate the importance of cis-coordination sites for selective head-to-tail CO2 reductive coupling, CO deinsertion, disproportionation, and stepwise CO2 deinsertion.
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Affiliation(s)
- Raja Pal
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Suyeon Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.,Center for Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea
| | - Woojong Lee
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.,Center for Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea
| | - Matthew R Mena
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Afshan Khurshid
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Chandrani Ghosh
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Thomas L Groy
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Andrew V G Chizmeshya
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Mu-Hyun Baik
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.,Center for Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea
| | - Ryan J Trovitch
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
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5
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Ghosh C, Kim S, Mena MR, Kim JH, Pal R, Rock CL, Groy TL, Baik MH, Trovitch RJ. Efficient Cobalt Catalyst for Ambient-Temperature Nitrile Dihydroboration, the Elucidation of a Chelate-Assisted Borylation Mechanism, and a New Synthetic Route to Amides. J Am Chem Soc 2019; 141:15327-15337. [PMID: 31462037 DOI: 10.1021/jacs.9b07529] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
N,N-Diborylamines have emerged as promising reagents in organic synthesis; however, their efficient preparation and full synthetic utility have yet to be realized. To address both shortcomings, an effective catalyst for nitrile dihydroboration was sought. Heating CoCl2 in the presence of PyEtPDI afforded the six-coordinate Co(II) salt, [(PyEtPDI)CoCl][Cl]. Upon adding 2 equiv of NaEt3BH, hydride transfer to one chelate imine functionality was observed, resulting in the formation of (κ4-N,N,N,N-PyEtIPCHMeNEtPy)Co. Single-crystal X-ray diffraction and density functional theory calculations revealed that this compound possesses a low-spin Co(II) ground state featuring antiferromagnetic coupling to a singly reduced imino(pyridine) moiety. Importantly, (κ4-N,N,N,N-PyEtIPCHMeNEtPy)Co was found to catalyze the dihydroboration of nitriles using HBPin with turnover frequencies of up to 380 h-1 at ambient temperature. Stoichiometric addition experiments revealed that HBPin adds across the Co-Namide bond to generate a hydride intermediate that can react with additional HBPin or nitriles. Computational evaluation of the reaction coordinate revealed that the B-H addition and nitrile insertion steps occur on the antiferromagnetically coupled triplet spin manifold. Interestingly, formation of the borylimine intermediate was found to occur following BPin transfer from the borylated chelate arm to regenerate (κ4-N,N,N,N-PyEtIPCHMeNEtPy)Co. Borylimine reduction is in turn facile and follows the same ligand-assisted borylation pathway. The independent hydroboration of alkyl and aryl imines was also demonstrated at 25 °C. With a series of N,N-diborylamines in hand, their addition to carboxylic acids allowed for the direct synthesis of amides at 120 °C, without the need for an exogenous coupling reagent.
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Affiliation(s)
- Chandrani Ghosh
- School of Molecular Sciences , Arizona State University , Tempe , Arizona 85287 , United States
| | - Suyeon Kim
- Department of Chemistry , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea.,Center for Catalytic Hydrocarbon Functionalizations , Institute for Basic Science (IBS) , Daejeon 34141 , Republic of Korea
| | - Matthew R Mena
- School of Molecular Sciences , Arizona State University , Tempe , Arizona 85287 , United States
| | - Jun-Hyeong Kim
- Department of Chemistry , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea.,Center for Catalytic Hydrocarbon Functionalizations , Institute for Basic Science (IBS) , Daejeon 34141 , Republic of Korea
| | - Raja Pal
- School of Molecular Sciences , Arizona State University , Tempe , Arizona 85287 , United States
| | - Christopher L Rock
- School of Molecular Sciences , Arizona State University , Tempe , Arizona 85287 , United States
| | - Thomas L Groy
- School of Molecular Sciences , Arizona State University , Tempe , Arizona 85287 , United States
| | - Mu-Hyun Baik
- Department of Chemistry , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea.,Center for Catalytic Hydrocarbon Functionalizations , Institute for Basic Science (IBS) , Daejeon 34141 , Republic of Korea
| | - Ryan J Trovitch
- School of Molecular Sciences , Arizona State University , Tempe , Arizona 85287 , United States
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6
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Römelt C, Weyhermüller T, Wieghardt K. Structural characteristics of redox-active pyridine-1,6-diimine complexes: Electronic structures and ligand oxidation levels. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2018.09.018] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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7
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Abstract
In recent years, interest in homogeneous manganese catalyst development has intensified because of the earth-abundant and nontoxic nature of this metal. Although compounds of Mn have largely been utilized for epoxidation reactions, recent efforts have revealed that Mn catalysts can mediate a broad range of reductive transformations. Low-valent Mn compounds have proven to be particularly effective for the hydrosilylation of carbonyl- and carboxylate-containing substrates, and this Account aims to highlight my research group's contributions to this field. In our initial 2014 communication, we reported that the bis(imino)pyridine-supported compound (Ph2PPrPDI)Mn mediates ketone hydrosilylation with exceptional activity under solvent-free conditions. Silanes including Ph2SiH2, (EtO)3SiH, (EtO)2MeSiH, and (EtO)Me2SiH were found to partially reduce cyclohexanone in the presence of (Ph2PPrPDI)Mn, while turnover frequencies of up to 1280 min-1 were observed using PhSiH3. This led us to evaluate the hydrosilylation of 11 additional ketones and allowed for the atom-efficient preparation of tertiary and quaternary silanes. At that time, it was also discovered that (Ph2PPrPDI)Mn catalyzes the dihydrosilylation of esters (by way of acyl C-O bond hydrosilylation) to yield a mixture of silyl ethers with modest activity. Earlier this year, the scope of these transformations was extended to aldehydes and formates, and the observed hydrosilylation activities are among the highest obtained for any transition-metal catalyst. The effectiveness of three related catalysts has also been evaluated: (Ph2PPrPDI)MnH, (PyEtPDEA)Mn, and [(Ph2PEtPDI)Mn]2. To our surprise, (Ph2PPrPDI)MnH was found to exhibit higher carboxylate dihydrosilylation activity than (Ph2PPrPDI)Mn, while (PyEtPDEA)Mn demonstrated remarkable carbonyl hydrosilylation activity considering that it lacks a redox-active supporting ligand. The evaluation of [(Ph2PEtPDI)Mn]2 revealed competitive aldehyde hydrosilylation and formate dihydrosilylation turnover frequencies; however, this catalyst is significantly inhibited by pyridine and alkene donor groups. In our efforts to fully understand how (Ph2PPrPDI)Mn operates, a thorough electronic structure evaluation was conducted, and the ground-state doublet calculated for this compound was found to exhibit nonclassical features consistent with a low-spin Mn(II) center supported by a singlet PDI dianion and an intermediate-spin Mn(II) configuration featuring antiferromagnetic coupling to PDI diradical dianion. A comprehensive mechanistic investigation of (Ph2PPrPDI)Mn- and (Ph2PPrPDI)MnH-mediated hydrosilylation has revealed two operable pathways, a modified Ojima pathway that is more active for carbonyl hydrosilylation and an insertion pathway that is more effective for carboxylate reduction. Although these efforts represent a small fraction of the recent advances made in Mn catalysis, this work has proven to be influential for the development of Mn-based reduction catalysts and is likely to inform future efforts to develop Mn catalysts that can be used to prepare silicones.
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Affiliation(s)
- Ryan J. Trovitch
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
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8
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Mukhopadhyay TK, Rock CL, Hong M, Ashley DC, Groy TL, Baik MH, Trovitch RJ. Mechanistic Investigation of Bis(imino)pyridine Manganese Catalyzed Carbonyl and Carboxylate Hydrosilylation. J Am Chem Soc 2017; 139:4901-4915. [DOI: 10.1021/jacs.7b00879] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Tufan K. Mukhopadhyay
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Christopher L. Rock
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Mannkyu Hong
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea
| | - Daniel C. Ashley
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Thomas L. Groy
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Mu-Hyun Baik
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea
| | - Ryan J. Trovitch
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
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9
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Wei Y, Liu SX, Mueller-Bunz H, Albrecht M. Synthesis of Triazolylidene Nickel Complexes and Their Catalytic Application in Selective Aldehyde Hydrosilylation. ACS Catal 2016. [DOI: 10.1021/acscatal.6b02269] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yingfei Wei
- Department
of Chemistry and Biochemistry, University of Bern, Freiestrasse
3, 3012 Bern, Switzerland
- School of Chemistry & Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland
| | - Shi-Xia Liu
- Department
of Chemistry and Biochemistry, University of Bern, Freiestrasse
3, 3012 Bern, Switzerland
| | - Helge Mueller-Bunz
- School of Chemistry & Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland
| | - Martin Albrecht
- Department
of Chemistry and Biochemistry, University of Bern, Freiestrasse
3, 3012 Bern, Switzerland
- School of Chemistry & Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland
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10
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Pal R, Cherry BR, Flores M, Groy TL, Trovitch RJ. Isolation of a bis(imino)pyridine molybdenum(i) iodide complex through controlled reduction and interconversion of its reaction products. Dalton Trans 2016; 45:10024-33. [PMID: 27095635 DOI: 10.1039/c6dt00301j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Analysis of previously reported [((Ph2PPr)PDI)MoI][I] by cyclic voltammetry revealed a reversible wave at -1.20 V vs. Fc(+/0), corresponding to the Mo(ii)/Mo(i) redox couple. Reduction of [((Ph2PPr)PDI)MoI][I] using stoichiometric K/naphthalene resulted in ligand deprotonation rather than reduction to yield a Mo(ii) monoiodide complex featuring a Mo-C bond to the α-position of one imine substituent, (κ(6)-P,N,N,N,C,P-(Ph2PPr)PDI)MoI. Successful isolation of the inner-sphere Mo(i) monoiodide complex, ((Ph2PPr)PDI)MoI, was achieved via reduction of [((Ph2PPr)PDI)MoI][I] with equimolar Na/naphthalene. This complex was found to have a near octahedral coordination geometry by single crystal X-ray diffraction and electron paramagnetic resonance (EPR) spectroscopy revealed an unpaired Mo-based electron which is highly delocalized onto the PDI chelate core. Attempts to prepare a Mo(i) monohydride complex upon adding NaEt3BH to ((Ph2PPr)PDI)MoI resulted in disproportionation to yield an equimolar quantity of (κ(6)-P,N,N,N,C,P-(Ph2PPr)PDI)MoH and newly identified ((Ph2PPr)PDI)MoH2. Independent preparation of ((Ph2PPr)PDI)MoH2 was achieved by adding 2 equiv. NaEt3BH to [((Ph2PPr)PDI)MoI][I] and a minimum hydride resonance T1 of 176 ms suggests that the Mo-bound H atoms are best described as classical hydrides. Interestingly, ((Ph2PPr)PDI)MoH2 can be converted to (κ(6)-P,N,N,N,C,P-(Ph2PPr)PDI)MoI upon iodomethane addition, while ((Ph2PPr)PDI)MoH2 is prepared from (κ(6)-P,N,N,N,C,P-(Ph2PPr)PDI)MoI in the presence of excess NaEt3BH. Similarly, (κ(6)-P,N,N,N,C,P-(Ph2PPr)PDI)MoI can be converted to (κ(6)-P,N,N,N,C,P-(Ph2PPr)PDI)MoH with 1 equiv. of NaEt3BH, while the opposite transformation occurs following iodomethane addition to (κ(6)-P,N,N,N,C,P-(Ph2PPr)PDI)MoH. Facile interconversion between [((Ph2PPr)PDI)MoI][I], (κ(6)-P,N,N,N,C,P-(Ph2PPr)PDI)MoI, (κ(6)-P,N,N,N,C,P-(Ph2PPr)PDI)MoH, and ((Ph2PPr)PDI)MoH2 is expected to guide future reactivity studies on this unique set of compounds.
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Affiliation(s)
- Raja Pal
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, USA.
| | - Brian R Cherry
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, USA.
| | - Marco Flores
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, USA.
| | - Thomas L Groy
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, USA.
| | - Ryan J Trovitch
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, USA.
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11
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Asako S, Ishikawa S, Takai K. Synthesis of Linear Allylsilanes via Molybdenum-Catalyzed Regioselective Hydrosilylation of Allenes. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00627] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sobi Asako
- Division of Applied Chemistry,
Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Sae Ishikawa
- Division of Applied Chemistry,
Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Kazuhiko Takai
- Division of Applied Chemistry,
Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
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12
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McLeod NA, Kuzmina LG, Korobkov I, Howard JAK, Nikonov GI. Hydridosilylamido complexes of Ta and Mo isolobal with Berry's zirconocenes: syntheses, β-Si-H agostic interactions, catalytic hydrosilylation, and insight into mechanism. Dalton Trans 2016; 45:2554-61. [PMID: 26727669 DOI: 10.1039/c5dt04548g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The syntheses of novel Group 5 and Group 6 hydrosilylamido complexes of the type R(ArN[double bond, length as m-dash])M{N((t)Bu)SiMe2-H}X (M = Ta, R = Cp; M = Mo, R = ArN; X = Cl, H, OBn, Me) are described. The various substituents in the X position seem to play the key role in determining the extent of β-agostic interaction with the Si-H bond. The Mo agostic hydrido complex (ArN[double bond, length as m-dash])2Mo{η(3)-N((t)Bu)SiMe2-H}H is a pre-catalyst for the hydrosilylation of carbonyls. The stoichiometric reaction between benzaldehyde and (ArN[double bond, length as m-dash])2Mo{η(3)-N((t)Bu)SiMe2-H}H gives the benzoxy complex (ArN[double bond, length as m-dash])2Mo{N((t)Bu)SiMe2-H}(OBn), which showed a similar catalytic reactivity compared to the parent hydride. Mechanistic studies suggest that a non-hydride mechanism is operative.
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Affiliation(s)
- Nicolas A McLeod
- Chemistry Department, Brock University, Niagara Region, 1812 Sir Isaac Brock Way, St. Catharines, ON L2S 3A1, Canada.
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13
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Pal R, Laureanti JA, Groy TL, Jones AK, Trovitch RJ. Hydrogen production from water using a bis(imino)pyridine molybdenum electrocatalyst. Chem Commun (Camb) 2016; 52:11555-8. [DOI: 10.1039/c6cc04946j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Reduction of [(Ph2PPrPDI)MoO][PF6]2 affords an unusual Mo(ii) oxo compound that mediates the electrocatalytic reduction of water.
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Affiliation(s)
- Raja Pal
- School of Molecular Sciences
- Arizona State University
- Tempe
- USA
| | | | - Thomas L. Groy
- School of Molecular Sciences
- Arizona State University
- Tempe
- USA
| | - Anne K. Jones
- School of Molecular Sciences
- Arizona State University
- Tempe
- USA
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Ghosh C, Mukhopadhyay TK, Flores M, Groy TL, Trovitch RJ. A Pentacoordinate Mn(II) Precatalyst That Exhibits Notable Aldehyde and Ketone Hydrosilylation Turnover Frequencies. Inorg Chem 2015; 54:10398-406. [DOI: 10.1021/acs.inorgchem.5b01825] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chandrani Ghosh
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Tufan K. Mukhopadhyay
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Marco Flores
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Thomas L. Groy
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Ryan J. Trovitch
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
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15
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Pal R, Groy TL, Trovitch RJ. Conversion of Carbon Dioxide to Methanol Using a C–H Activated Bis(imino)pyridine Molybdenum Hydroboration Catalyst. Inorg Chem 2015. [DOI: 10.1021/acs.inorgchem.5b01102] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Raja Pal
- Department of Chemistry and
Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Thomas L. Groy
- Department of Chemistry and
Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Ryan J. Trovitch
- Department of Chemistry and
Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
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16
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Mukhopadhyay TK, MacLean NL, Gan L, Ashley DC, Groy TL, Baik MH, Jones AK, Trovitch RJ. Carbon Dioxide Promoted H+ Reduction Using a Bis(imino)pyridine Manganese Electrocatalyst. Inorg Chem 2015; 54:4475-82. [DOI: 10.1021/acs.inorgchem.5b00315] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tufan K. Mukhopadhyay
- Department of Chemistry & Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Nicholas L. MacLean
- Department of Chemistry & Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Lu Gan
- Department of Chemistry & Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Daniel C. Ashley
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Thomas L. Groy
- Department of Chemistry & Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Mu-Hyun Baik
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Anne K. Jones
- Department of Chemistry & Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Ryan J. Trovitch
- Department of Chemistry & Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
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Anderson NH, Odoh SO, Williams UJ, Lewis AJ, Wagner GL, Lezama Pacheco J, Kozimor SA, Gagliardi L, Schelter EJ, Bart SC. Investigation of the electronic ground states for a reduced pyridine(diimine) uranium series: evidence for a ligand tetraanion stabilized by a uranium dimer. J Am Chem Soc 2015; 137:4690-700. [PMID: 25830409 DOI: 10.1021/ja511867a] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The electronic structures of a series of highly reduced uranium complexes bearing the redox-active pyridine(diimine) ligand, (Mes)PDI(Me) ((Mes)PDI(Me) = 2,6-(2,4,6-Me3-C6H2-N═CMe)2C5H3N) have been investigated. The complexes, ((Mes)PDI(Me))UI3(THF) (1), ((Mes)PDI(Me))UI2(THF)2 (2), [((Mes)PDI(Me))UI]2 (3), and [((Mes)PDI(Me))U(THF)]2 (4), were examined using electronic and X-ray absorption spectroscopies, magnetometry, and computational analyses. Taken together, these studies suggest that all members of the series contain uranium(IV) centers with 5f (2) configurations and reduced ligand frameworks, specifically [(Mes)PDI(Me)](•/-), [(Mes)PDI(Me)](2-), [(Mes)PDI(Me)](3-) and [(Mes)PDI(Me)](4-), respectively. In the cases of 2, 3, and 4 no unpaired spin density was found on the ligands, indicating a singlet diradical ligand in monomeric 2 and ligand electron spin-pairing through dimerization in 3 and 4. Interaction energies, representing enthalpies of dimerization, of -116.0 and -144.4 kcal mol(-1) were calculated using DFT for the monomers of 3 and 4, respectively, showing there is a large stabilization gained by dimerization through uranium-arene bonds. Highlighted in these studies is compound 4, bearing a previously unobserved pyridine(diimine) tetraanion, that was uniquely stabilized by backbonding between uranium cations and the η(5)-pyridyl ring.
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Affiliation(s)
- Nickolas H Anderson
- †H.C. Brown Laboratory, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Samuel O Odoh
- ‡Department of Chemistry, Supercomputing Institute, and Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Ursula J Williams
- §P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Andrew J Lewis
- §P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Gregory L Wagner
- ∥Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Juan Lezama Pacheco
- ⊥School of Earth Sciences, Environmental Earth System Science Department, Stanford University, Stanford, California 94305-4216, United States
| | - Stosh A Kozimor
- ∥Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Laura Gagliardi
- ‡Department of Chemistry, Supercomputing Institute, and Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Eric J Schelter
- §P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Suzanne C Bart
- †H.C. Brown Laboratory, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
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Mukhopadhyay TK, Flores M, Feller RK, Scott BL, Taylor RD, Paz-Pasternak M, Henson NJ, Rein FN, Smythe NC, Trovitch RJ, Gordon JC. A New Spin on Cyclooctatetraene (COT) Redox Activity: Low-Spin Iron(I) Complexes That Exhibit Antiferromagnetic Coupling to a Singly Reduced η4-COT Ligand. Organometallics 2014. [DOI: 10.1021/om500909h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Tufan K. Mukhopadhyay
- Department of Chemistry & Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Marco Flores
- Department of Chemistry & Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Russell K. Feller
- Materials
Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Brian L. Scott
- Materials
Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - R. Dean Taylor
- Materials
Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Moshe Paz-Pasternak
- School
of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv, Israel
| | - Neil J. Henson
- Theoretical
Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Francisca N. Rein
- Chemistry
Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Nathan C. Smythe
- Chemistry
Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Ryan J. Trovitch
- Department of Chemistry & Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - John C. Gordon
- Chemistry
Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
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19
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Margulieux GW, Turner ZR, Chirik PJ. Synthesis and Ligand Modification Chemistry of a Molybdenum Dinitrogen Complex: Redox and Chemical Activity of a Bis(imino)pyridine Ligand. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201408725] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Margulieux GW, Turner ZR, Chirik PJ. Synthesis and ligand modification chemistry of a molybdenum dinitrogen complex: redox and chemical activity of a bis(imino)pyridine ligand. Angew Chem Int Ed Engl 2014; 53:14211-5. [PMID: 25324154 DOI: 10.1002/anie.201408725] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Indexed: 11/07/2022]
Abstract
The bis(imino)pyridine 2,6-(2,6-iPr2-C6H3N=CPh)2-C5H3N ((iPr)BPDI) molybdenum dinitrogen complex, [{((iPr)BPDI)Mo(N2)}2(μ2,η(1),η(1)-N2)] has been prepared and contains both weakly (terminal) and modestly (bridging) activated N2 ligands. Addition of ammonia resulted in sequential N-H bond activations, thus forming bridging parent imido (μ-NH) ligands with concomitant reduction of one of the imines of the supporting chelate. Using primary and secondary amines, model intermediates have been isolated that highlight the role of metal-ligand cooperativity in NH3 oxidation.
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Affiliation(s)
- Grant W Margulieux
- Department of Chemistry, Princeton University, Frick Laboratory 292, Princeton, 08544 (USA)
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