151
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Ramírez-Contreras R, Cosio MN, Park S, Bhuvanesh N, Ozerov OV. Arene Coordination Induces Migration of a Hydride to a Ru-Bound Carbene of a Pincer Ligand. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.121747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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152
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Elahi SM, Raizada M, Sahu PK, Konar S. Terpyridine-Based 3D Metal-Organic-Frameworks: A Structure-Property Correlation. Chemistry 2021; 27:5858-5870. [PMID: 33258175 DOI: 10.1002/chem.202004651] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Indexed: 12/13/2022]
Abstract
Design, synthesis, and applications of metal-organic frameworks (MOFs) are among the most salient fields of research in modern inorganic and materials chemistry. As the structure and physical properties of MOFs are mostly dependent on the organic linkers or ligands, the choice of ligand system is of utmost importance in the design of MOFs. One such crucial organic linker/ligand is terpyridine (tpy), which can adopt various coordination modes to generate an enormous number of metal-organic frameworks. These frameworks generally carry physicochemical characteristics induced by the π-electron-rich (basically N-electron-rich moiety) terpyridines. In this minireview, the construction of 3D MOFs associated with symmetrical terpyridines is discussed. These ligands can be easily derivatized at the lateral phenyl (4'-phenyl) position and incorporate additional organic functionalities. These functionalities lead to some different binding modes and form higher dimensional (3D) frameworks. Therefore, these 3D MOFs can carry multiple features along with the characteristics of terpyridines. Some properties of these MOFs, like photophysical, chemical selectivity, photocatalytic degradation, proton conductivity, and magnetism, etc. have also been discussed and correlated with their frameworks.
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Affiliation(s)
- Syed Meheboob Elahi
- Department of Chemistry, IISER Bhopal, Bhopal By-Pass Road, Bhopal, 462066, Madhya Pradesh, India
| | - Mukul Raizada
- Department of Chemistry, IISER Bhopal, Bhopal By-Pass Road, Bhopal, 462066, Madhya Pradesh, India
| | - Pradip Kumar Sahu
- Department of Chemistry, IISER Bhopal, Bhopal By-Pass Road, Bhopal, 462066, Madhya Pradesh, India
| | - Sanjit Konar
- Department of Chemistry, IISER Bhopal, Bhopal By-Pass Road, Bhopal, 462066, Madhya Pradesh, India
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153
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Anafcheh M, Zahedi M. Computational Design of New Hydroborane Fullerene-Based Pincer Ligands. J CLUST SCI 2021. [DOI: 10.1007/s10876-021-02051-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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154
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Liu J, Wei Z, Jiao H. Catalytic Activity of Aliphatic PNP Ligated Co III/I Amine and Amido Complexes in Hydrogenation Reaction—Structure, Stability, and Substrate Dependence. ACS Catal 2021. [DOI: 10.1021/acscatal.0c05562] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Jiali Liu
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China
- National Energy Center for Coal to Liquids, Synfuels China Company, Limited, Huairou District, Beijing 101400, P. R. China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, P. R. China
| | - Zhihong Wei
- Institute of Molecular Science, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Shanxi University, Taiyuan 030006, P. R. China
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Straße 29a, Rostock 18059, Germany
| | - Haijun Jiao
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Straße 29a, Rostock 18059, Germany
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155
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Hung MU, Press LP, Bhuvanesh N, Ozerov OV. Examination of a Series of Ir and Rh PXL Pincer Complexes as (Pre)catalysts for Aromatic C–H Borylation. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00081] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ming-Uei Hung
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - Loren P. Press
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - Oleg V. Ozerov
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
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156
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Sharma MK, Rottschäfer D, Neumann B, Stammler HG, Danés S, Andrada DM, van Gastel M, Hinz A, Ghadwal RS. Metalloradical Cations and Dications Based on Divinyldiphosphene and Divinyldiarsene Ligands. Chemistry 2021; 27:5803-5809. [PMID: 33470468 PMCID: PMC8048781 DOI: 10.1002/chem.202100213] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Indexed: 01/09/2023]
Abstract
Metalloradicals are key species in synthesis, catalysis, and bioinorganic chemistry. Herein, two iron radical cation complexes (3‐E)GaCl4 [(3‐E).+ = [{(IPr)C(Ph)E}2Fe(CO)3].+, E = P or As; IPr = C{(NDipp)CH}2, Dipp = 2,6‐iPr2C6H3] are reported as crystalline solids. Treatment of the divinyldipnictenes {(IPr)C(Ph)E}2 (1‐E) with Fe2(CO)9 affords [{(IPr)C(Ph)E}2Fe(CO)3] (2‐E), in which 1‐E binds to the Fe atom in an allylic (η3‐EECvinyl) fashion and functions as a 4e donor ligand. Complexes 2‐E undergo 1e oxidation with GaCl3 to yield (3‐E)GaCl4. Spin density analysis revealed that the unpaired electron in (3‐E).+ is mainly located on the Fe (52–64 %) and vinylic C (30–36 %) atoms. Further 1e oxidation of (3‐E)GaCl4 leads to unprecedented η3‐EECvinyl to η3‐ECvinylCPh coordination shuttling to form the dications (4‐E)(GaCl4)2.
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Affiliation(s)
- Mahendra K Sharma
- Molecular Inorganic Chemistry and Catalysis, Inorganic and Structural Chemistry, Center for Molecular Materials, Faculty of Chemistry, Universität Bielefeld, Universitätsstrasse 25, 33615, Bielefeld, Germany
| | - Dennis Rottschäfer
- Molecular Inorganic Chemistry and Catalysis, Inorganic and Structural Chemistry, Center for Molecular Materials, Faculty of Chemistry, Universität Bielefeld, Universitätsstrasse 25, 33615, Bielefeld, Germany
| | - Beate Neumann
- Molecular Inorganic Chemistry and Catalysis, Inorganic and Structural Chemistry, Center for Molecular Materials, Faculty of Chemistry, Universität Bielefeld, Universitätsstrasse 25, 33615, Bielefeld, Germany
| | - Hans-Georg Stammler
- Molecular Inorganic Chemistry and Catalysis, Inorganic and Structural Chemistry, Center for Molecular Materials, Faculty of Chemistry, Universität Bielefeld, Universitätsstrasse 25, 33615, Bielefeld, Germany
| | - Sergi Danés
- Allgemeine und Anorganische Chemie, Universität des Saarlandes, Campus C4.1, 66123, Saarbrücken, Germany
| | - Diego M Andrada
- Allgemeine und Anorganische Chemie, Universität des Saarlandes, Campus C4.1, 66123, Saarbrücken, Germany
| | - Maurice van Gastel
- Max-Planck-Institut für Kohlenforschung Molecular Theory and Spectroscopy, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany
| | - Alexander Hinz
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131, Karlsruhe, Germany
| | - Rajendra S Ghadwal
- Molecular Inorganic Chemistry and Catalysis, Inorganic and Structural Chemistry, Center for Molecular Materials, Faculty of Chemistry, Universität Bielefeld, Universitätsstrasse 25, 33615, Bielefeld, Germany
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157
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Alawisi H, Arman HD, Tonzetich ZJ. Catalytic Hydrogenation of Alkenes and Alkynes by a Cobalt Pincer Complex: Evidence of Roles for Both Co(I) and Co(II). Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00053] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Hussah Alawisi
- Department of Chemistry, University of Texas at San Antonio (UTSA), San Antonio, Texas 78249, United States
- Department of Chemistry, King Faisal University, Al Hofuf, Kingdom of Saudi Arabia
| | - Hadi D. Arman
- Department of Chemistry, University of Texas at San Antonio (UTSA), San Antonio, Texas 78249, United States
| | - Zachary J. Tonzetich
- Department of Chemistry, University of Texas at San Antonio (UTSA), San Antonio, Texas 78249, United States
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158
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Müller I, Werncke CG. Reductive Coupling of (Fluoro)pyridines by Linear 3d-Metal(I) Silylamides of Cr-Co: A Tale of C-C Bond Formation, C-F Bond Cleavage and a Pyridyl Radical Anion. Chemistry 2021; 27:4932-4938. [PMID: 33453071 PMCID: PMC7986091 DOI: 10.1002/chem.202004852] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 12/21/2020] [Indexed: 01/10/2023]
Abstract
Herein, we disclose the facile reduction of pyridine (and its derivatives) by linear 3d-metal(I) silylamides (M=Cr-Co). This reaction resulted in intermolecular C-C coupling to give dinuclear metal(II) complexes bearing a bridging 4,4'-dihydrobipyridyl ligand. For iron, we demonstrated that the C-C coupling is reversible in solution, either directly or by reaction with substrates, via a presumed monomeric metal(II) complex bearing a pyridyl radical anion. In the course of this investigation, we also observed that the dinuclear metal(II) complex incorporating iron facilitated the isomerisation of 1,4-cyclohexadiene to 1,3-cyclohexadiene as well as equimolar amounts of benzene and cyclohexene. Furthermore, we synthesised and structurally characterised a non-3d-metal-bound pyridyl radical anion. The reactions of the silylamides with perfluoropyridine led to C-F bond cleavage with the formation of metal(II) fluoride complexes of manganese, iron and cobalt along with the homocoupling or reductive degradation of the substrate. In the case of cobalt, the use of lesser fluorinated pyridines led to C-F bond cleavage but no homocoupling. Overall, in this paper we provide insights into the multifaceted behaviour of simple (fluoro)pyridines in the presence of moderately to highly reducing metal complexes.
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Affiliation(s)
- Igor Müller
- Fachbereich Chemie/Department of ChemistryPhilipps-Universität MarburgHans-Meerwein-Strasse 435037MarburgGermany
| | - Christian Gunnar Werncke
- Fachbereich Chemie/Department of ChemistryPhilipps-Universität MarburgHans-Meerwein-Strasse 435037MarburgGermany
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159
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Hood TM, Chaplin AB. Synthesis and reactivity of iridium complexes of a macrocyclic PNP pincer ligand. Dalton Trans 2021; 50:2472-2482. [PMID: 33511383 DOI: 10.1039/d0dt04303f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Having recently reported on the synthesis and rhodium complexes of the novel macrocyclic pincer ligand PNP-14, which is derived from lutidine and features terminal phosphine donors trans-substituted with a tetradecamethylene linker (Dalton Trans., 2020, 49, 2077-2086 and Dalton Trans., 2020, 49, 16649-16652), we herein describe our findings critically examining the chemistry of iridium homologues. The five-coordinate iridium(i) and iridium(iii) complexes [Ir(PNP-14)(η2:η2-cyclooctadiene)][BArF4] and [Ir(PNP-14)(2,2'-biphenyl)][BArF4] are readily prepared and shown to be effective precursors for the generation of iridium(iii) dihydride dihydrogen, iridium(i) bis(ethylene), and iridium(i) carbonyl derivatives that highlight important periodic trends by comparison to rhodium counterparts. Reaction of [Ir(PNP-14)H2(H2)][BArF4] with 3,3-dimethylbutene induced triple C-H bond activation of the methylene chain, yielding an iridium(iii) allyl hydride derivative [Ir(PNP-14*)H][BArF4], whilst catalytic homocoupling of 3,3-dimethylbutyne into Z-tBuC[triple bond, length as m-dash]CCHCHtBu could be promoted at RT by [Ir(PNP-14)(η2:η2-cyclooctadiene)][BArF4] (TOFinitial = 28 h-1). The mechanism of the latter is proposed to involve formation and direct reaction of a vinylidene derivative with HC[triple bond, length as m-dash]CtBu outside of the macrocyclic ring and this suggestion is supported experimentally by isolation and crystallographic characterisation of a catalyst deactivation product.
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Affiliation(s)
- Thomas M Hood
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK.
| | - Adrian B Chaplin
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK.
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160
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Arauzo A, Cabeza JA, Fernández I, García‐Álvarez P, García‐Rubio I, Laglera‐Gándara CJ. Reactions of Late First‐Row Transition Metal (Fe‐Zn) Dichlorides with a PGeP Pincer Germylene. Chemistry 2021; 27:4985-4992. [DOI: 10.1002/chem.202005289] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Indexed: 01/07/2023]
Affiliation(s)
- Ana Arauzo
- Instituto de Nanociencia y Materiales de Aragón (INMA) CSIC-Universidad de Zaragoza 50009 Zaragoza Spain
| | - Javier A. Cabeza
- Centro de Innovación en Química Avanzada (ORFEO-CINQA) Departamento de Química Orgánica e Inorgánica Universidad de Oviedo 33071 Oviedo Spain
| | - Israel Fernández
- Centro de Innovación en Química Avanzada (ORFEO-CINQA) Departamento de Química Orgánica I Facultad de Ciencias Químicas Universidad Complutense de Madrid 28040 Madrid Spain
| | - Pablo García‐Álvarez
- Centro de Innovación en Química Avanzada (ORFEO-CINQA) Departamento de Química Orgánica e Inorgánica Universidad de Oviedo 33071 Oviedo Spain
| | - Inés García‐Rubio
- Instituto de Nanociencia y Materiales de Aragón (INMA) CSIC-Universidad de Zaragoza 50009 Zaragoza Spain
- Academia General Militar Centro Universitario de la Defensa 50090 Zaragoza Spain
| | - Carlos J. Laglera‐Gándara
- Centro de Innovación en Química Avanzada (ORFEO-CINQA) Departamento de Química Orgánica e Inorgánica Universidad de Oviedo 33071 Oviedo Spain
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161
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Sun X, Zhu C. Synthesis, characterization and reactivity of a neutral antimony(III) complex. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2020.07.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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162
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Cabelof AC, Erny AM, Carta V, Pink M, Caulton KG. Anion metathesis and chlorination of late transition metal pincer complexes: Comparing Co, Rh and Zn. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2020.120118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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163
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Shendge P, Sharma S, Baral M, Patel A, Parekh S, Kanungo BK. Synthesis, characterization and application of molecular hammock and pincer type complexes. PHOSPHORUS SULFUR 2021. [DOI: 10.1080/10426507.2020.1825431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Pratidnya Shendge
- Department of Chemistry, National Institute of Technology Kurukshetra, Kurukshetra, Haryana, India
| | - Shailza Sharma
- Department of Chemistry, National Institute of Technology Kurukshetra, Kurukshetra, Haryana, India
| | - Minati Baral
- Department of Chemistry, National Institute of Technology Kurukshetra, Kurukshetra, Haryana, India
| | - Apurva Patel
- Deparment of Biotechnology, Veer Narmad South, Gujrat University, Surat, Gujarat, India
| | - Smita Parekh
- Deparment of Biotechnology, Veer Narmad South, Gujrat University, Surat, Gujarat, India
| | - B. K Kanungo
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal, Punjab, India
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164
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Das PK, Bhunia S, Chakraborty P, Chatterjee S, Rana A, Peramaiah K, Alsabban MM, Dutta I, Dey A, Huang KW. Electrocatalytic Water Oxidation by a Phosphorus-Nitrogen O═PN 3-Pincer Cobalt Complex. Inorg Chem 2021; 60:614-622. [PMID: 33236627 DOI: 10.1021/acs.inorgchem.0c02376] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Water oxidation is a primary step in natural as well as artificial photosynthesis to convert renewable solar energy into chemical energy/fuels. Electrocatalytic water oxidation to evolve O2, utilizing suitable low-cost catalysts and renewable electricity, is of fundamental importance considering contemporary energy and environmental issues, yet it is kinetically challenging owing to the complex multiproton/electron transfer processes. Herein, we report the first cobalt-based pincer catalyst for catalytic water oxidation at neutral pH with high efficiency under electrochemical conditions. Most importantly, ligand (pseudo)aromaticity is identified to play an important role during electrocatalysis. A significant potential jump (∼300 mV) was achieved toward a lower positive value when the aromatized cobalt complex was transformed into a (pseudo)dearomatized cobalt species. The dearomatized species catalyzes the water oxidation reaction to evolve oxygen at a much lower overpotential (∼340 mV) on the basis of the onset potential (at a current density of 0.5 mA/cm2) of catalysis at pH 10.5, outperforming other Co-based molecular catalysts reported to date. These observations may provide a new strategy for the judicious design of earth-abundant transition-metal-based water oxidation catalysts.
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Affiliation(s)
- Pradip K Das
- KAUST Catalysis Center and Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Sarmistha Bhunia
- School of Chemical Science, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Priyanka Chakraborty
- KAUST Catalysis Center and Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Sudipta Chatterjee
- KAUST Catalysis Center and Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Atanu Rana
- School of Chemical Science, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Karthik Peramaiah
- KAUST Catalysis Center and Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Merfat M Alsabban
- KAUST Catalysis Center and Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Indranil Dutta
- KAUST Catalysis Center and Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Abhishek Dey
- School of Chemical Science, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Kuo-Wei Huang
- KAUST Catalysis Center and Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
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165
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Recent progress on group 10 metal complexes of pincer ligands: From synthesis to activities and catalysis. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2021. [DOI: 10.1016/bs.adomc.2021.04.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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166
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Arora V, Narjinari H, Nandi PG, Kumar A. Recent advances in pincer-nickel catalyzed reactions. Dalton Trans 2021; 50:3394-3428. [PMID: 33595564 DOI: 10.1039/d0dt03593a] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Organometallic catalysts have played a key role in accomplishing numerous synthetically valuable organic transformations that are either otherwise not possible or inefficient. The use of precious, sparse and toxic 4d and 5d metals are an apparent downside of several such catalytic systems despite their immense success over the last several decades. The use of complexes containing Earth-abundant, inexpensive and less hazardous 3d metals, such as nickel, as catalysts for organic transformations has been an emerging field in recent times. In particular, the versatile nature of the corresponding pincer-metal complexes, which offers great control of their reactivity via countless variations, has garnered great interest among organometallic chemists who are looking for greener and cheaper alternatives. In this context, the current review attempts to provide a glimpse of recent developments in the chemistry of pincer-nickel catalyzed reactions. Notably, there have been examples of pincer-nickel catalyzed reactions involving two electron changes via purely organometallic mechanisms that are strikingly similar to those observed with heavier Pd and Pt analogues. On the other hand, there have been distinct differences where the pincer-nickel complexes catalyze single-electron radical reactions. The applicability of pincer-nickel complexes in catalyzing cross-coupling reactions, oxidation reactions, (de)hydrogenation reactions, dehydrogenative coupling, hydrosilylation, hydroboration, C-H activation and carbon dioxide functionalization has been reviewed here from synthesis and mechanistic points of view. The flurry of global pincer-nickel related activities offer promising avenues in catalyzing synthetically valuable organic transformations.
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Affiliation(s)
- Vinay Arora
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India.
| | - Himani Narjinari
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India.
| | - Pran Gobinda Nandi
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India.
| | - Akshai Kumar
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India. and Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
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167
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Castillo-García AA, González-Sebastián L, Lomas-Romero L, Hernandez-Ortega S, Toscano RA, Morales-Morales D. Novel meta-benzothiazole and benzimidazole functionalised POCOP-Ni( ii) pincer complexes as efficient catalysts in the production of diarylketones. NEW J CHEM 2021. [DOI: 10.1039/d1nj01348c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Novel meta-benzothiazole and benzimidazole functionalised POCOP-Ni(ii) pincer complexes were synthesized and used as effcient catalysts for the production of diarylketones.
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Affiliation(s)
- Antonio A. Castillo-García
- Instituto de Química
- Universidad Nacional Autónoma de México
- Circuito Exterior
- Ciudad Universitaria
- Ciudad de México
| | | | - Leticia Lomas-Romero
- Departamento de Química
- Universidad Autónoma Metropolitana-Iztapalapa
- Ciudad de México
- Mexico
| | - Simon Hernandez-Ortega
- Instituto de Química
- Universidad Nacional Autónoma de México
- Circuito Exterior
- Ciudad Universitaria
- Ciudad de México
| | - Ruben A. Toscano
- Instituto de Química
- Universidad Nacional Autónoma de México
- Circuito Exterior
- Ciudad Universitaria
- Ciudad de México
| | - David Morales-Morales
- Instituto de Química
- Universidad Nacional Autónoma de México
- Circuito Exterior
- Ciudad Universitaria
- Ciudad de México
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168
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Jung HJ, Cho Y, Kim D, Mehrkhodavandi P. Cationic aluminum, gallium, and indium complexes in catalysis. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01741h] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The introduction of cationic charge allows cationic group 13 complexes to be excellent Lewis acid catalysts. Cationic aluminum, gallium, and indium complexes in catalysis are comprehensively reviewed based on the reaction type.
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Affiliation(s)
- Hyuk-Joon Jung
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
| | - Youngjung Cho
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
| | - Diana Kim
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
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169
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Gitnes RM, Wang M, Bao Y, Scheuermann ML. In Situ Generation of Catalytically Relevant Nanoparticles from a Molecular Pincer Iridium Precatalyst during Polyol Deoxygenation. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03180] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rachael M. Gitnes
- Department of Chemistry, Western Washington University, 516 High Street—MS-9150, Bellingham, Washington 98225, United States
| | - Maggie Wang
- Department of Chemistry, Western Washington University, 516 High Street—MS-9150, Bellingham, Washington 98225, United States
| | - Ying Bao
- Department of Chemistry, Western Washington University, 516 High Street—MS-9150, Bellingham, Washington 98225, United States
| | - Margaret L. Scheuermann
- Department of Chemistry, Western Washington University, 516 High Street—MS-9150, Bellingham, Washington 98225, United States
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170
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Feuerstein W, Holzer C, Gui X, Neumeier L, Klopper W, Breher F. Synthesis of New Donor-Substituted Biphenyls: Pre-ligands for Highly Luminescent (C^C^D) Gold(III) Pincer Complexes. Chemistry 2020; 26:17156-17164. [PMID: 32735695 PMCID: PMC7821303 DOI: 10.1002/chem.202003271] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Revised: 07/31/2020] [Indexed: 12/31/2022]
Abstract
We herein report on new synthetic strategies for the preparation of pyridine and imidazole substituted 2,2'-dihalo biphenyls. These structures are pre-ligands suitable for the preparation of respective stannoles. The latter can successfully be transmetalated to K[AuCl4 ] forming non-palindromic [(C^C^D)AuIII ] pincer complexes featuring a lateral pyridine (D=N) or N-heterocyclic carbene (NHC, D=C') donor. The latter is the first report on a pincer complex with two formally anionic sp2 and one carbenic carbon donor. The [(C^C^D)AuIII ] complexes show intense phosphorescence in solution at room temperature. We discuss the developed multistep strategy and touch upon synthetic challenges. The prepared complexes have been fully characterized including X-ray diffraction analysis. The gold(III) complexes' photophysical properties have been investigated by absorption and emission spectroscopy as well as quantum chemical calculations on the quasi-relativistic two-component TD-DFT and GW/Bethe-Salpeter level including spin-orbit coupling. Thus, we shed light on the electronic influence of the non-palindromic pincer ligand and reveal non-radiative relaxation pathways of the different ligands employed.
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Affiliation(s)
- Wolfram Feuerstein
- Institute of Inorganic ChemistryKarlsruhe Institute of, Technology (KIT)Engesserstr. 1576131KarlsruheGermany
| | - Christof Holzer
- Institute of Theoretical Solid State PhysicsKarlsruhe Institute of, Technology (KIT)Wolfgang-Gaede-Straße 176131KarlsruheGermany
| | - Xin Gui
- Institute of Physical ChemistryKarlsruhe Institute of, Technology (KIT)Fritz-Haber-Weg 276131KarlsruheGermany
| | - Lilly Neumeier
- Institute of Inorganic ChemistryKarlsruhe Institute of, Technology (KIT)Engesserstr. 1576131KarlsruheGermany
| | - Wim Klopper
- Institute of Physical ChemistryKarlsruhe Institute of, Technology (KIT)Fritz-Haber-Weg 276131KarlsruheGermany
| | - Frank Breher
- Institute of Inorganic ChemistryKarlsruhe Institute of, Technology (KIT)Engesserstr. 1576131KarlsruheGermany
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171
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Wang Y, Zhang B, Guo S. Transition Metal Complexes Supported by N‐Heterocyclic Carbene‐Based Pincer Platforms: Synthesis, Reactivity and Applications. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000911] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Yidan Wang
- Department of Chemistry Capital Normal University Beijing 100048 China
| | - Bo Zhang
- Department of Chemistry Capital Normal University Beijing 100048 China
| | - Shuai Guo
- Department of Chemistry Capital Normal University Beijing 100048 China
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172
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Huang M, Lee W, Zou X, Lee C, Hong S, Liang L. Amido PNP pincer complexes of palladium(II) and platinum(II): Synthesis, structure, and reactivity. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.6128] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Mei‐Hui Huang
- Department of Chemistry National Sun Yat‐sen University Kaohsiung Taiwan
| | - Wei‐Ying Lee
- Department of Chemistry National Sun Yat‐sen University Kaohsiung Taiwan
| | - Xue‐Ru Zou
- Department of Chemistry National Sun Yat‐sen University Kaohsiung Taiwan
| | - Chia‐Chin Lee
- Department of Chemistry National Sun Yat‐sen University Kaohsiung Taiwan
| | - Sheng‐Bo Hong
- Department of Chemistry National Sun Yat‐sen University Kaohsiung Taiwan
| | - Lan‐Chang Liang
- Department of Chemistry National Sun Yat‐sen University Kaohsiung Taiwan
- Department of Medicinal and Applied Chemistry Kaohsiung Medical University Kaohsiung Taiwan
- School of Pharmacy Kaohsiung Medical University Kaohsiung Taiwan
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173
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Idelson C, Webster L, Krämer T, Chadwick FM. Asymmetric bis-PNP pincer complexes of zirconium and hafnium - a measure of hemilability. Dalton Trans 2020; 49:16653-16656. [PMID: 33191415 DOI: 10.1039/d0dt03544k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Asymmetrically-bound pyrrolide-based bis-PNP pincer complexes of zirconium and hafnium have been formed. The [κ2-PNPPh][κ3-PNPPh]MCl2 species are in direct contrast to previous zirconium PNP pincer complexes. The pincer ligands are fluxional in their binding and the energy barrier for exchange has been approximated using VT-NMR spectroscopy and the result validated by DFT calculations.
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Affiliation(s)
- Celia Idelson
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City, Shepherds Bush, London, W12 0BZ, UK.
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174
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Lai Q, Bhuvanesh N, Ozerov OV. Unexpected B/Al Transelementation within a Rh Pincer Complex. J Am Chem Soc 2020; 142:20920-20923. [DOI: 10.1021/jacs.0c09344] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Qingheng Lai
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - Oleg V. Ozerov
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
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175
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Meyer T, Konrath R, Kamer PCJ, Wu X. Pincer Ligand Enhanced Rhodium‐Catalyzed Carbonylation of Formaldehyde: Direct Ethylene Glycol Production. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000573] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Tim Meyer
- Leibniz-Institut für Katalyse e.V. (LIKAT) an der Universität Rostock Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Robert Konrath
- Leibniz-Institut für Katalyse e.V. (LIKAT) an der Universität Rostock Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Paul C. J. Kamer
- Leibniz-Institut für Katalyse e.V. (LIKAT) an der Universität Rostock Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Xiao‐Feng Wu
- Leibniz-Institut für Katalyse e.V. (LIKAT) an der Universität Rostock Albert-Einstein-Straße 29a 18059 Rostock Germany
- Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics, Chinese Academy of Sciences 116023 Dalian Liaoning P. R. China
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176
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Storey CM, Gyton MR, Andrew RE, Chaplin AB. Terminal Alkyne Coupling Reactions Through a Ring: Effect of Ring Size on Rate and Regioselectivity. Chemistry 2020; 26:14715-14723. [PMID: 32677713 PMCID: PMC7756505 DOI: 10.1002/chem.202002962] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 07/15/2020] [Indexed: 01/11/2023]
Abstract
Terminal alkyne coupling reactions promoted by rhodium(I) complexes of macrocyclic NHC-based pincer ligands-which feature dodecamethylene, tetradecamethylene or hexadecamethylene wingtip linkers viz. [Rh(CNC-n)(C2 H4 )][BArF 4 ] (n=12, 14, 16; ArF =3,5-(CF3 )2 C6 H3 )-have been investigated, using the bulky alkynes HC≡CtBu and HC≡CAr' (Ar'=3,5-tBu2 C6 H3 ) as substrates. These stoichiometric reactions proceed with formation of rhodium(III) alkynyl alkenyl derivatives and produce rhodium(I) complexes of conjugated 1,3-enynes by C-C bond reductive elimination through the annulus of the ancillary ligand. The intermediates are formed with orthogonal regioselectivity, with E-alkenyl complexes derived from HC≡CtBu and gem-alkenyl complexes derived from HC≡CAr', and the reductive elimination step is appreciably affected by the ring size of the macrocycle. For the homocoupling of HC≡CtBu, E-tBuC≡CCH=CHtBu is produced via direct reductive elimination from the corresponding rhodium(III) alkynyl E-alkenyl derivatives with increasing efficacy as the ring is expanded. In contrast, direct reductive elimination of Ar'C≡CC(=CH2 )Ar' is encumbered relative to head-to-head coupling of HC≡CAr' and it is only with the largest macrocyclic ligand studied that the two processes are competitive. These results showcase how macrocyclic ligands can be used to interrogate the mechanism and tune the outcome of terminal alkyne coupling reactions, and are discussed with reference to catalytic reactions mediated by the acyclic homologue [Rh(CNC-Me)(C2 H4 )][BArF 4 ] and solvent effects.
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Affiliation(s)
- Caroline M. Storey
- Department of ChemistryUniversity of WarwickGibbet Hill RoadCoventryCV4 7ALUK
| | - Matthew R. Gyton
- Department of ChemistryUniversity of WarwickGibbet Hill RoadCoventryCV4 7ALUK
| | - Rhiann E. Andrew
- Department of ChemistryUniversity of WarwickGibbet Hill RoadCoventryCV4 7ALUK
| | - Adrian B. Chaplin
- Department of ChemistryUniversity of WarwickGibbet Hill RoadCoventryCV4 7ALUK
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177
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Li QZ, Hara N, Nakao Y, Sakaki S. Coordination Flexibility of the Rh(PXP) Complex to NH 3, CO, and C 2H 4 (PXP = Diphosphine-Based Pincer Ligand; X = B, Al, and Ga): Theoretical Insight. Inorg Chem 2020; 59:15862-15876. [PMID: 33054207 DOI: 10.1021/acs.inorgchem.0c02390] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The recently synthesized rhodium-aluminum bimetallic complex Rh(PAlP) 1 (PAlP = pincer-type diphosphino-aluminyl ligand Al{[N(C6H4)]2NMe}[CH2P(iPr)2]2) containing a unique Rh-Al direct bond exhibits coordination flexibility because Rh and Al can play the role of coordination site for the substrate. DFT calculations of NH3, CO, and C2H4 adducts with 1 show that the Rh atom is favorable for all these substrate but the Al atom is as favorable as the Rh atom for NH3 and unfavorable for CO and C2H4. NH3 and CO prefer the coordination at the Rh-axial (Ax) site to the Rh-equatorial (Eq) site, but C2H4 prefers coordination at the Rh-Eq site to the Rh-Ax site. Consequently, two CO and C2H4 molecules coordinate with 1 at the Rh-Ax and Rh-Eq sites to afford trigonal bipyramidal complexes Rh(PAlP)(CO)2 and Rh(PAlP)(C2H4)2, which is consistent with the experimental observation of Rh(PAlP)(CO)2. Energy decomposition analysis reveals that an electrostatic term plays an important role for NH3 coordination with the Al atom of 1, because Al has a significantly large positive charge and NH3 has a much negatively charged N atom and exhibits a considerably negative electrostatic potential at the Al position. In B and Ga analogues Rh(PBP) 2 and Rh(PGaP) 3, B and Ga atoms are not good for CO and C2H4 like the Al atom in 1. NH3 adducts with 2 and 3 at the B and Ga sites are less stable than those adducts at the Rh-Ax site unlike the NH3 adduct with 1 at the Al site. This difference in the NH3 adduct between Rh(PAlP) and others (Rh(PBP) and Rh(PGaP)) arises from much less positive charges of B and Ga and a smaller atomic size of B than that of Al. These results indicate that the significantly large electropositive nature and appropriate atomic size of Al are responsible for the characteristic coordination flexibility of Rh(PAlP).
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Affiliation(s)
- Qiao-Zhi Li
- Fukui Institute for Fundamental Chemistry, Kyoto University, Takano-Nishi-hiraki-cho 34-4, Sakyo-ku, Kyoto 606-8103, Japan
| | - Naofumi Hara
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Yoshiaki Nakao
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Shigeyoshi Sakaki
- Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Goryo-Ohara 1-30, Nishikyo-ku, Kyoto 615-8510, Japan
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178
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König M, Rigo M, Chaoui N, Tran Ngoc T, Epping JD, Schmidt J, Pachfule P, Ye M, Trunk M, Teichert JF, Drieß M, Thomas A. Immobilization of an Iridium Pincer Complex in a Microporous Polymer for Application in Room‐Temperature Gas Phase Catalysis. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Michaela König
- Institut für Chemie Technische Universität Berlin Hardenbergstrasse 40 10623 Berlin Germany
| | - Massimo Rigo
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Germany
| | - Nicolas Chaoui
- Institut für Chemie Technische Universität Berlin Hardenbergstrasse 40 10623 Berlin Germany
| | - Trung Tran Ngoc
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Germany
| | - Jan Dirk Epping
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Germany
| | - Johannes Schmidt
- Institut für Chemie Technische Universität Berlin Hardenbergstrasse 40 10623 Berlin Germany
| | - Pradip Pachfule
- Institut für Chemie Technische Universität Berlin Hardenbergstrasse 40 10623 Berlin Germany
| | - Meng‐Yang Ye
- Institut für Chemie Technische Universität Berlin Hardenbergstrasse 40 10623 Berlin Germany
| | - Matthias Trunk
- Institut für Chemie Technische Universität Berlin Hardenbergstrasse 40 10623 Berlin Germany
| | - Johannes F. Teichert
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Germany
| | - Matthias Drieß
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Germany
| | - Arne Thomas
- Institut für Chemie Technische Universität Berlin Hardenbergstrasse 40 10623 Berlin Germany
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179
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König M, Rigo M, Chaoui N, Tran Ngoc T, Epping JD, Schmidt J, Pachfule P, Ye M, Trunk M, Teichert JF, Drieß M, Thomas A. Immobilization of an Iridium Pincer Complex in a Microporous Polymer for Application in Room-Temperature Gas Phase Catalysis. Angew Chem Int Ed Engl 2020; 59:19830-19834. [PMID: 32614513 PMCID: PMC7692909 DOI: 10.1002/anie.202004092] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 06/26/2020] [Indexed: 11/06/2022]
Abstract
An iridium dihydride pincer complex [IrH2 (POCOP)] is immobilized in a hydroxy-functionalized microporous polymer network using the concepts of surface organometallic chemistry. The introduction of this novel, truly innocent support with remote OH-groups enables the formation of isolated active metal sites embedded in a chemically robust and highly inert environment. The catalyst maintained high porosity and without prior activation exhibited efficacy in the gas phase hydrogenation of ethene and propene at room temperature and low pressure. The catalyst can be recycled for at least four times.
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Affiliation(s)
- Michaela König
- Institut für ChemieTechnische Universität BerlinHardenbergstrasse 4010623BerlinGermany
| | - Massimo Rigo
- Institut für ChemieTechnische Universität BerlinStraße des 17. Juni 11510623BerlinGermany
| | - Nicolas Chaoui
- Institut für ChemieTechnische Universität BerlinHardenbergstrasse 4010623BerlinGermany
| | - Trung Tran Ngoc
- Institut für ChemieTechnische Universität BerlinStraße des 17. Juni 11510623BerlinGermany
| | - Jan Dirk Epping
- Institut für ChemieTechnische Universität BerlinStraße des 17. Juni 11510623BerlinGermany
| | - Johannes Schmidt
- Institut für ChemieTechnische Universität BerlinHardenbergstrasse 4010623BerlinGermany
| | - Pradip Pachfule
- Institut für ChemieTechnische Universität BerlinHardenbergstrasse 4010623BerlinGermany
| | - Meng‐Yang Ye
- Institut für ChemieTechnische Universität BerlinHardenbergstrasse 4010623BerlinGermany
| | - Matthias Trunk
- Institut für ChemieTechnische Universität BerlinHardenbergstrasse 4010623BerlinGermany
| | - Johannes F. Teichert
- Institut für ChemieTechnische Universität BerlinStraße des 17. Juni 11510623BerlinGermany
| | - Matthias Drieß
- Institut für ChemieTechnische Universität BerlinStraße des 17. Juni 11510623BerlinGermany
| | - Arne Thomas
- Institut für ChemieTechnische Universität BerlinHardenbergstrasse 4010623BerlinGermany
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180
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Miecznikowski JR, Jasinski JP, Ostrowski TJ, Landy KR, Bonitatibus SC, Smolinsky AN, Bertolotti NR. Crystal structure and spectroscopic properties of aqua-dichlorido-{1,1'-[(pyridine-2,6-diyl-κ N)bis(methyl-ene)]bis-(4-butyl-4,5-di-hydro-1 H-1,2,4-triazole-5-thione-κ N 2)}cobalt(II). Acta Crystallogr E Crystallogr Commun 2020; 76:1757-1761. [PMID: 33209348 PMCID: PMC7643238 DOI: 10.1107/s2056989020013547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 10/09/2020] [Indexed: 03/31/2024]
Abstract
The structure of the title compound, [CoCl2(C19H27N7S2)(H2O)], at 173 K has monoclinic (C2/c) symmetry. We report here the synthesis, single-crystal structure, electrospray mass spectrum and NMR spectroscopy of a new six-coordinate cobalt(II) pincer complex. The pincer ligand, in this complex, which is novel, coordinates via three nitro-gen atoms (two triazole and one pyridine). The ligand is ambidentate and can coordinate via three nitro-gen atoms or two sulfur and one nitro-gen atoms. The cobalt(II) metal center has pseudo-octa-hedral geometry and based on the single-crystal structure, the pincer ligand coordinates in a meridional fashion with the metal and adjacent six-membered ring ligands all in a similar plane and forming two slightly distorted boat configurations. The other two coordinated monodentate ligands are one water mol-ecule and two chloride ions with four cobalt(II) complexes in the unit cell. The asymmetric unit of the complex is comprised of half the pyridine ring and water mol-ecule with the CoII atom at the center of the pincer situated about a twofold axis. The Co-N, Co-O, and Co-Cl bond lengths are consistent with single bonds. In the crystal, the complex forms a three-centre bifurcated weak hydrogen-bonding inter-action with a chlorine ion, forming one inter-molecular inter-action with the pincer group and a water mol-ecule and a second intra-molecular inter-action with a C-H group within the pincer group. Crystal packing is also highlighted with C 2 2(6)>a a>a ring motifs, forming a three-dimensional supra-molecular network structure. While some stacking of the pyridine rings in the unit cell is observed, there are no relevant π-π inter-actions in the crystal packing. The 1H and 13C{1H} NMR spectra of the complex are consistent with a plane of symmetry being present. The electrospray mass spectrum, which was collected in positive ion mode, showed the loss of one water mol-ecule and one chloride ligand from the complex. In the future, we plan to screen this cobalt(II) complex for electrocatalysis reactivity.
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Affiliation(s)
- John R. Miecznikowski
- Department of Chemistry and Biochemistry, Fairfield University, 1073 North Benson Road, Fairfield, CT 06824, USA
| | - Jerry P. Jasinski
- Department of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435, USA
| | - Tyler J. Ostrowski
- Department of Chemistry and Biochemistry, Fairfield University, 1073 North Benson Road, Fairfield, CT 06824, USA
| | - Kendra R. Landy
- Department of Chemistry and Biochemistry, Fairfield University, 1073 North Benson Road, Fairfield, CT 06824, USA
| | - Sheila C. Bonitatibus
- Department of Chemistry and Biochemistry, Fairfield University, 1073 North Benson Road, Fairfield, CT 06824, USA
| | - Allison N. Smolinsky
- Department of Chemistry and Biochemistry, Fairfield University, 1073 North Benson Road, Fairfield, CT 06824, USA
| | - Natalia R. Bertolotti
- Department of Chemistry and Biochemistry, Fairfield University, 1073 North Benson Road, Fairfield, CT 06824, USA
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181
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Dias HVR, Pramanik A. Nickel(II) carbonyl, ammonia, and aceto-nitrile complexes supported by a pyridine dipyrrolide pincer ligand. Acta Crystallogr E Crystallogr Commun 2020; 76:1741-1747. [PMID: 33209345 PMCID: PMC7643235 DOI: 10.1107/s2056989020013341] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Accepted: 10/05/2020] [Indexed: 01/12/2023]
Abstract
The synthesis, isolation and crystal structures of nickel(II) carbonyl, aceto-nitrile and ammonia complexes supported by a dianionic, pyridine dipyrrolide pincer ligand [pyrr2py]2-, namely, carbonyl[2,2'-(pyridine-2,6-di-yl)bis-(3,5-di-p-tolyl-pyrrolido-κN)]-nickel(II), [Ni(C41H33N3)(CO)], ammine[2,2'-(pyridine-2,6-di-yl)bis-(3,5-di-p-tolyl-pyrrolido-κN)]nickel(II), [Ni(C41H33N3)(NH3)], and (aceto-nitrile-κN)[2,2'-(pyridine-2,6-di-yl)bis-(3,5-di-p-tolyl-pyrrolido-κN)]nickel(II), [Ni(C41H33N3)(CH3CN)], as well as the free ligand 2,6-bis-(3,5-di-p-tolyl-pyrrol-2-yl)pyridine, C41H35N3 or [pyrr2py]H2 are reported. The nickel complexes are four-coordinate and adopt a square-planar geometry. The CO stretch of the nickel-bound carbon monoxide ligand of [pyrr2py]Ni(CO) has been observed at 2101 cm-1. The ammonia and aceto-nitrile complexes, [pyrr2py]Ni(NH3) and [pyrr2py]Ni(NCMe) feature all-nitro-gen coordination spheres around nickel consisting of different N-donor ligand types.
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Affiliation(s)
- H. V. Rasika Dias
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, USA
| | - Abhijit Pramanik
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, USA
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182
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Chelate ring size effects of Ir(P,N,N) complexes: Chemoselectivity switch in the asymmetric hydrogenation of α,β-unsaturated ketones. CATAL COMMUN 2020. [DOI: 10.1016/j.catcom.2020.106128] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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183
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Development of unique dianionic Ir(III) CCC pincer complexes with a favourable spirocyclic NHC framework. Sci China Chem 2020. [DOI: 10.1007/s11426-020-9875-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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184
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Kundu S. Pincer-Type Ligand-Assisted Catalysis and Small-Molecule Activation by non-VSEPR Main-Group Compounds. Chem Asian J 2020; 15:3209-3224. [PMID: 32794320 DOI: 10.1002/asia.202000800] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/11/2020] [Indexed: 12/21/2022]
Abstract
In 2005, a facile dihydrogen activation was reported by the Power group using an alkyne analog of germanium [ArGe≡GeAr; Ar=2,6-Trip2 -C6 H3 (Trip=2,4,6-i Pr3 -C6 H2 )]. After that, a significant progress has been made in the activation of various small molecules by main-group compounds, and a variety of stoichiometric and catalytic processes have been formulated using the p-block elements. In this regard, compounds containing low-valent main-group elements with a frontier orbitals of relatively small energy gaps or compounds forming frustrated Lewis pair (FLP) became quite successful. In spite of these promising stoichiometric and catalytic transformations, redox-cycling catalysts based on main-group elements remain extremely rare. Recently, it has been observed that pincer type ligands supported geometry constrained main-group compounds are capable of acting as redox catalysts similar to those of the transition metals. In this review, we focus on the synthesis and the structural aspects of the geometry constrained main-group compounds using pincer ligands. Emphasis has been placed on their applications on catalytic activity and small molecules activation.
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Affiliation(s)
- Subrata Kundu
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
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185
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Structural Effect of Pincer Pd(II)–ONO Complexes Modified with Acylthiourea on Sizes of the In Situ Generated Pd Nanoparticles During Heck Coupling Reaction. Catal Letters 2020. [DOI: 10.1007/s10562-020-03413-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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186
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Dostál L, Jambor R, Aman M, Hejda M. (N),C,N-Coordinated Heavier Group 13-15 Compounds: Synthesis, Structure and Applications. Chempluschem 2020; 85:2320-2340. [PMID: 33073931 DOI: 10.1002/cplu.202000620] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 09/23/2020] [Indexed: 01/07/2023]
Abstract
The aim of this review is to summarize recent achievements in the field of (N),C,N-coordinated group 13-15 compounds not only regarding their synthesis and structure, but mainly focusing on their potential applications. Relevant compounds contain various types of N-coordinating ligands built up on an ortho-(di)substituted phenyl platform. Thus, group 13 and 14 derivatives were used as single-source precursors for the deposition of semiconducting thin films, as building blocks for the preparation of high-molecular polymers with remarkable optical and chemical properties or as compounds with interesting reactivity in hydrometallation processes. Group 15 derivatives function as catalysts in the Mannich reaction, in the allylation of aldehydes or activation of CO2 . They were used as transmetallation reagents in transition metal catalysed coupling reactions. The univalent species serve as ligands for transition metals, activate alkynes or alkenes and are utilized as catalysts in the transfer hydrogenation of azo-compounds.
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Affiliation(s)
- Libor Dostál
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice 532 10, Czech Republic
| | - Roman Jambor
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice 532 10, Czech Republic
| | - Michal Aman
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice 532 10, Czech Republic
| | - Martin Hejda
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice 532 10, Czech Republic
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187
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Yan X, Zhang B, Zhang X, Wang H, Duan Y, Guo S. Symmetrical and Non‐symmetrical Pd (II) Pincer Complexes Bearing Mesoionic N‐heterocyclic Thiones: Synthesis, Characterizations and Catalytic Properties. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5885] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Xuechao Yan
- Department of Chemistry Capital Normal University Beijing 100048 China
| | - Bo Zhang
- Department of Chemistry Capital Normal University Beijing 100048 China
| | - Xin Zhang
- Department of Chemistry Capital Normal University Beijing 100048 China
| | - Haiying Wang
- Department of Chemistry Capital Normal University Beijing 100048 China
| | - Yu‐Ai Duan
- Department of Chemistry Capital Normal University Beijing 100048 China
| | - Shuai Guo
- Department of Chemistry Capital Normal University Beijing 100048 China
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188
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Al-Noaimi M, Awwadi FF, Hammoudeh A, Abdel-Rahman OS, Alwahsh MI. Ruthenium (II) quinoline-azoimine complex: Synthesis, crystalline structures spectroelectrochemistry and catalytic properties. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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189
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Panahi F, Haghighi F, Khalafi‐Nezhad A. Reduction of Aldehydes with Formic acid in Ethanol using Immobilized Iridium Nanoparticles on a Triazine‐phosphanimine Polymeric Organic Support. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5880] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Farhad Panahi
- Department of Chemistry, College of Sciences Shiraz University Shiraz 71454 Iran
| | - Fatemeh Haghighi
- Department of Chemistry, College of Sciences Shiraz University Shiraz 71454 Iran
| | - Ali Khalafi‐Nezhad
- Department of Chemistry, College of Sciences Shiraz University Shiraz 71454 Iran
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190
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Kamitani M, Yujiri K, Yuge H. Hemisphere and Distance-Dependent Steric Analysis of PNN Iron Pincer Complexes Using SambVca 2.1 and Its Influence on Alkene Hydrosilylation. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00512] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Masahiro Kamitani
- Department of Chemistry, School of Science, Kitasato University, 1-15-1 Kitazato, Minami-ku, Sagamihara 252-0373, Japan
| | - Kouta Yujiri
- Department of Chemistry, School of Science, Kitasato University, 1-15-1 Kitazato, Minami-ku, Sagamihara 252-0373, Japan
| | - Hidetaka Yuge
- Department of Chemistry, School of Science, Kitasato University, 1-15-1 Kitazato, Minami-ku, Sagamihara 252-0373, Japan
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191
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Yang XW, Li DH, Song AX, Liu FS. "Bulky-Yet-Flexible" α-Diimine Palladium-Catalyzed Reductive Heck Cross-Coupling: Highly Anti-Markovnikov-Selective Hydroarylation of Alkene in Air. J Org Chem 2020; 85:11750-11765. [PMID: 32808522 DOI: 10.1021/acs.joc.0c01509] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
To pursue a highly regioselective and efficient reductive Heck reaction, a series of moisture- and air-stable α-diimine palladium precatalysts were rationally designed, readily synthesized, and fully characterized. The relationship between the structures of the palladium complexes and the catalytic properties was investigated. It was revealed that the"bulky-yet-flexible"palladium complexes allowed highly anti-Markovnikov-selective hydroarylation of alkenes with (hetero)aryl bromides under aerobic conditions. Further synthetic application of the present protocol could provide rapid and straightforward access to functional and biologically active molecules.
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Affiliation(s)
- Xu-Wen Yang
- School of Chemistry and Chemical Engineering, Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China
| | - Dong-Hui Li
- School of Chemistry and Chemical Engineering, Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China
| | - A-Xiang Song
- School of Chemistry and Chemical Engineering, Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China
| | - Feng-Shou Liu
- School of Chemistry and Chemical Engineering, Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China
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192
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Li Y, Fan W, Zhang Z, Xie X, Xiang S, Huang D. Copper(II)-hydroxide facilitated C-C bond formation: the carboxamido pyridine system versus the methylimino pyridine system. Dalton Trans 2020; 49:12189-12196. [PMID: 32930687 DOI: 10.1039/d0dt02288h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A copper(ii)-hydroxide-induced carbon-carbon bond formation reaction is explored with the synthesis of an asymmetric carboxamido-methylimino pyridine Cu(i) complex of [CuI(py(N-C[double bond, length as m-dash]O)(N[double bond, length as m-dash]C-C)ph2Me2)2]- (12). Two imine-methyl groups are coupled to form a bridged C-C bond (N[double bond, length as m-dash]C-C-C-C[double bond, length as m-dash]N) at the methyl positions with the reduction of two Cu2+ center ions to Cu+. The reaction is checked with three dicarboxamido pyridine [CuII-OH] complexes, with which dinuclear Cu(i) complexes of [Cu2(py(N-C[double bond, length as m-dash]O)2ph2R2)2]2- (R = methyl (3), methyl and allyl (6)) and trinuclear [CuII-CuI-CuII] complex of [Cu3(⊂20-py(N-C[double bond, length as m-dash]O)2ph2dienMe3)2]+ (9) are obtained. The reactivities of the [CuII-L] (L = DMF, OH-) complexes in dicarboxamido pyridine, carboxamido-methylimino pyridine and dimethylimino pyridine systems are discussed in terms of the electron delocalization properties of ligands. A cooperative metal-ligand (Cu2+ and enamide ligand) interaction is proposed based on the characterization of ligated Cu(ii) intermediates with the techniques of X-ray crystallography, UV-vis spectroscopy, cyclic voltammogram, EPR spectroscopy, and DFT calculations.
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Affiliation(s)
- Yinghua Li
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
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193
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Affiliation(s)
- Matthias Vogt
- Institute of Chemistry Faculty of Natural Science II Martin Luther University Halle‐Wittenberg Kurt‐Mothes‐Str. 2 06120 Halle (Saale) Germany
| | - Robert Langer
- Institute of Chemistry Faculty of Natural Science II Martin Luther University Halle‐Wittenberg Kurt‐Mothes‐Str. 2 06120 Halle (Saale) Germany
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194
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Gupta A, Deka R, Butcher RJ, Singh HB. Structure of a diorganotelluroxonium(IV) cation, {[2,6-(CH 2NMe 2) 2C 6H 3Te(μ-O)] 2} 2+, with the tri-chlorido-(dimethyl sulfoxide)-platinum(II) anion. Acta Crystallogr E Crystallogr Commun 2020; 76:1520-1524. [PMID: 32939311 PMCID: PMC7472760 DOI: 10.1107/s2056989020011482] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 08/21/2020] [Indexed: 11/11/2022]
Abstract
In the title salt, di-μ-oxido-bis-{2,6-bis-[(di-methyl-amino)-meth-yl]phenyl-κC 1}tellurium(-IV) bis[tri-chlorido-(dimethyl sulfoxide-κS)platinate(II)], (C24H38N4O2Te2)[PdCl3(C2H6OS)]2, which crystallizes in the triclinic space group P , each Te atom is in a distorted five-coordinated TeO2N2C square-pyramidal geometry (τ values of 0.026 and 0.001) with the C atoms of the phenyl rings occupying the apical positions. The phenyl rings in the [C24H38N4O2Te2]2+ cation are in a cis arrangement to enable this species to participate in Te⋯Cl cation-anion inter-actions. There are also C-H⋯O inter-actions involving the dimethyl sulfoxide ligands and numerous cation-anion and anion-anion C-H⋯Cl inter-actions, which link the ions into a complex three-dimensional array.
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Affiliation(s)
- Anand Gupta
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Rajesh Deka
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Ray J. Butcher
- Department of Chemistry, Howard University, 525 College Street NW, Washington DC 20059, USA
| | - Harkesh B. Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
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195
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Abbenseth J, Goicoechea JM. Recent developments in the chemistry of non-trigonal pnictogen pincer compounds: from bonding to catalysis. Chem Sci 2020; 11:9728-9740. [PMID: 34094237 PMCID: PMC8162179 DOI: 10.1039/d0sc03819a] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 08/18/2020] [Indexed: 01/01/2023] Open
Abstract
The combination of well-established meridionally coordinating, tridentate pincer ligands with group 15 elements affords geometrically constrained non-trigonal pnictogen pincer compounds. These species show remarkable activity in challenging element-hydrogen bond scission reactions, such as the activation of ammonia. The electronic structures of these compounds and the implications they have on their electrochemical properties and transition metal coordination are described. Furthermore, stoichiometric and catalytic bond forming reactions involving B-H, N-H and O-H bonds as well as carbon nucleophiles are presented.
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Affiliation(s)
- Josh Abbenseth
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford Mansfield Road Oxford OX1 3TA UK
| | - Jose M Goicoechea
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford Mansfield Road Oxford OX1 3TA UK
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196
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Bregante DT, Tan JZ, Schultz RL, Ayla EZ, Potts DS, Torres C, Flaherty DW. Catalytic Consequences of Oxidant, Alkene, and Pore Structures on Alkene Epoxidations within Titanium Silicates. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02183] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniel T. Bregante
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Jun Zhi Tan
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Rebecca L. Schultz
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - E. Zeynep Ayla
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - David S. Potts
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Chris Torres
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - David W. Flaherty
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
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197
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Hu G, Jiang JJ, Kelly HR, Matula AJ, Wu Y, Romano N, Mercado BQ, Wang H, Batista VS, Crabtree RH, Brudvig GW. Surprisingly big linker-dependence of activity and selectivity in CO 2 reduction by an iridium(i) pincer complex. Chem Commun (Camb) 2020; 56:9126-9129. [PMID: 32779668 DOI: 10.1039/d0cc03207g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Here, we report the quantitative electroreduction of CO2 to CO by a PNP-pincer iridium(i) complex bearing amino linkers in DMF/water. The electrocatalytic properties greatly depend on the choice of linker within the ligand. The complex 3-N is far superior to the analogues with methylene and oxygen linkers, showing higher activity and better selectivity for CO2 over proton reduction.
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Affiliation(s)
- Gongfang Hu
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, USA. and Energy Sciences Institute, Yale University, West Haven, Connecticut 06516, USA
| | - Jianbing Jimmy Jiang
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, USA.
| | - H Ray Kelly
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, USA. and Energy Sciences Institute, Yale University, West Haven, Connecticut 06516, USA
| | - Adam J Matula
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, USA. and Energy Sciences Institute, Yale University, West Haven, Connecticut 06516, USA
| | - Yueshen Wu
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, USA. and Energy Sciences Institute, Yale University, West Haven, Connecticut 06516, USA
| | - Neyen Romano
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, USA. and Energy Sciences Institute, Yale University, West Haven, Connecticut 06516, USA
| | - Brandon Q Mercado
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, USA.
| | - Hailiang Wang
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, USA. and Energy Sciences Institute, Yale University, West Haven, Connecticut 06516, USA
| | - Victor S Batista
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, USA. and Energy Sciences Institute, Yale University, West Haven, Connecticut 06516, USA
| | - Robert H Crabtree
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, USA. and Energy Sciences Institute, Yale University, West Haven, Connecticut 06516, USA
| | - Gary W Brudvig
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, USA. and Energy Sciences Institute, Yale University, West Haven, Connecticut 06516, USA
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198
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Swisher NA, Grubbs RH. Synthesis and Characterization of 3,5-Bis(di- tert-butylphosphinito)pyridine Pincer Complexes. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nicholas A. Swisher
- Arnold and Mabel Beckman Laboratory for Chemical Synthesis, California Institute of Technology, Pasadena, California 91125, United States
| | - Robert H. Grubbs
- Arnold and Mabel Beckman Laboratory for Chemical Synthesis, California Institute of Technology, Pasadena, California 91125, United States
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199
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Abstract
Our planet urgently needs sustainable solutions to alleviate the anthropogenic global warming and climate change. Homogeneous catalysis has the potential to play a fundamental role in this process, providing novel, efficient, and at the same time eco-friendly routes for both chemicals and energy production. In particular, pincer-type ligation shows promising properties in terms of long-term stability and selectivity, as well as allowing for mild reaction conditions and low catalyst loading. Indeed, pincer complexes have been applied to a plethora of sustainable chemical processes, such as hydrogen release, CO2 capture and conversion, N2 fixation, and biomass valorization for the synthesis of high-value chemicals and fuels. In this work, we show the main advances of the last five years in the use of pincer transition metal complexes in key catalytic processes aiming for a more sustainable chemical and energy production.
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200
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Hussein MA, Dinh AH, Huynh VT, Nguyen TV. Synthesis of tertiary amines by direct Brønsted acid catalyzed reductive amination. Chem Commun (Camb) 2020; 56:8691-8694. [PMID: 32613957 DOI: 10.1039/d0cc02955f] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Tertiary amines are ubiquitous and valuable compounds in synthetic chemistry, with a wide range of applications in organocatalysis, organometallic complexes, biological processes and pharmaceutical chemistry. One of the most frequently used pathways to synthesize tertiary amines is the reductive amination reaction of carbonyl compounds. Despite developments of numerous new reductive amination methods in the past few decades, this reaction generally requires non-atom-economic processes with harsh conditions and toxic transition-metal catalysts. Herein, we report simple yet practical protocols using triflic acid as a catalyst to efficiently promote the direct reductive amination reactions of carbonyl compounds on a broad range of substrates. Applications of this new method to generate valuable heterocyclic frameworks and polyamines are also included.
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Affiliation(s)
- Mohanad A Hussein
- School of Chemistry, University of New South Wales, Sydney, Australia.
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