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Nguyen BX, VandeVen W, MacNeil GA, Zhou W, Paterson AR, Walsby CJ, Chiang L. High-Valent Ni and Cu Complexes of a Tetraanionic Bis(amidateanilido) Ligand. Inorg Chem 2023; 62:15180-15194. [PMID: 37676794 DOI: 10.1021/acs.inorgchem.3c02358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/09/2023]
Abstract
High-valent metal species are often invoked as intermediates during enzymatic and synthetic catalytic cycles. Anionic donors are often required to stabilize such high-valent states by forming strong bonds with the Lewis acidic metal centers while decreasing their oxidation potentials. In this report, we discuss the synthesis of two high-valent metal complexes [ML]+ in which the NiIII and CuIII centers are ligated by a new tetradentate, tetraanionic bis(amidateanilido) ligand. [ML]+, obtained via chemical oxidation of ML, exhibits UV-vis-NIR, EPR, and XANES spectra characteristic of square planar, high-valent MIII species, suggesting the locus of oxidation for both [ML]+ is predominantly metal-based. This is supported by theoretical analyses, which also support the observed visible transitions as ligand-to-metal charge transfer transitions characteristic of square planar, high-valent MIII species. Notably, [ML]+ can also be obtained via O2 oxidation of ML due to its remarkably negative oxidation potentials (CuL/[CuL]+: -1.16 V, NiL/[NiL]+: -1.01 V vs Fc/Fc+ in MeCN). This demonstrates the exceptionally strong donating nature of the tetraanionic bis(amidateanilido) ligation and its ability to stabilize high-valent metal centers..
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Affiliation(s)
- Bach X Nguyen
- Department of Chemistry, University of the Fraser Valley, Abbotsford, British Columbia V2S 7M8, Canada
- Department of Chemistry, Simon Fraser University, Burnaby, British Columba V5A 1S6, Canada
| | - Warren VandeVen
- Department of Chemistry, Simon Fraser University, Burnaby, British Columba V5A 1S6, Canada
| | - Gregory A MacNeil
- Department of Chemistry, Simon Fraser University, Burnaby, British Columba V5A 1S6, Canada
| | - Wen Zhou
- Department of Chemistry, Simon Fraser University, Burnaby, British Columba V5A 1S6, Canada
| | - Alisa R Paterson
- Canadian Light Source, 44 Innovation Boulevard, Saskatoon, Saskatchewan S7N 2 V3, Canada
| | - Charles J Walsby
- Department of Chemistry, Simon Fraser University, Burnaby, British Columba V5A 1S6, Canada
| | - Linus Chiang
- Department of Chemistry, University of the Fraser Valley, Abbotsford, British Columbia V2S 7M8, Canada
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2
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Taeschler C, Kirchner E, Păunescu E, Mayerhöffer U. Copper-Free Alternatives to Access Ketone Building Blocks from Grignard Reagents. ACS OMEGA 2022; 7:3613-3617. [PMID: 35128268 PMCID: PMC8811905 DOI: 10.1021/acsomega.1c06202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 01/05/2022] [Indexed: 06/14/2023]
Abstract
Grignard reactions are an efficient way to form carbon-carbon bonds with widespread applications in large-scale processes. Classically, the electrophiles of choice to form ketones from Grignard reagents are acid chlorides. The reactions are typically catalyzed by additives such as CuCl to increase selectivity and yields. This work was focused on the use of acetic anhydride as an alternative to acetic chloride in the synthesis of 4-fluoro-2-(trifluoromethyl)acetophenone (3), a useful intermediate for the synthesis of active agricultural ingredients. The use of acetic anhydride as an electrophile not only equals but also surpasses acetic chloride in yield and selectivity, while also being more tolerable toward higher reaction temperatures. Furthermore, the reaction was performed in the absence of any additive, making it a highly attractive process for large-scale production. Computational mechanistic studies suggest that this advantageous behavior can be ascribed to the superior complexation of carboxylic acid anhydrides in the transition state.
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Brandt A, RanguMagar AB, Szwedo P, Wayland HA, Parnell CM, Munshi P, Ghosh A. Highly economical and direct amination of sp 3 carbon using low-cost nickel pincer catalyst. RSC Adv 2021; 11:1862-1874. [PMID: 35424101 PMCID: PMC8693581 DOI: 10.1039/d0ra09639c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Accepted: 12/07/2020] [Indexed: 11/21/2022] Open
Abstract
Developing more efficient routes to achieve C-N bond coupling is of great importance to industries ranging from products in pharmaceuticals and fertilizers to biomedical technologies and next-generation electroactive materials. Over the past decade, improvements in catalyst design have moved synthesis away from expensive metals to newer inexpensive C-N cross-coupling approaches via direct amine alkylation. For the first time, we report the use of an amide-based nickel pincer catalyst (1) for direct alkylation of amines via activation of sp3 C-H bonds. The reaction was accomplished using a 0.2 mol% catalyst and no additional activating agents other than the base. Upon optimization, it was determined that the ideal reaction conditions involved solvent dimethyl sulfoxide at 110 °C for 3 h. The catalyst demonstrated excellent reactivity in the formation of various imines, intramolecularly cyclized amines, and substituted amines with a turnover number (TON) as high as 183. Depending on the base used for the reaction and the starting amines, the catalyst demonstrated high selectivity towards the product formation. The exploration into the mechanism and kinetics of the reaction pathway suggested the C-H activation as the rate-limiting step, with the reaction second-order overall, holding first-order behavior towards the catalyst and toluene substrate.
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Affiliation(s)
- Andrew Brandt
- Department of Chemistry, University of Arkansas at Little Rock 2801 South University Avenue Little Rock AR 72204 USA +1 501 569 8838 +1 501 569 8827
| | - Ambar B RanguMagar
- Department of Chemistry, University of Arkansas at Little Rock 2801 South University Avenue Little Rock AR 72204 USA +1 501 569 8838 +1 501 569 8827
| | - Peter Szwedo
- Department of Chemistry, University of Arkansas at Little Rock 2801 South University Avenue Little Rock AR 72204 USA +1 501 569 8838 +1 501 569 8827
| | - Hunter A Wayland
- Department of Chemistry, University of Arkansas at Little Rock 2801 South University Avenue Little Rock AR 72204 USA +1 501 569 8838 +1 501 569 8827
| | - Charlette M Parnell
- Department of Chemistry, University of Arkansas at Little Rock 2801 South University Avenue Little Rock AR 72204 USA +1 501 569 8838 +1 501 569 8827
| | - Pradip Munshi
- Research Center, Reliance Industries Limited Vadodara Gujarat 391346 India +91 265 261 6066
| | - Anindya Ghosh
- Department of Chemistry, University of Arkansas at Little Rock 2801 South University Avenue Little Rock AR 72204 USA +1 501 569 8838 +1 501 569 8827
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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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Vijayan P, Yadav S, Yadav S, Gupta R. Ruthenium(II) complexes of pyridine-carboxamide ligands bearing appended benzothiazole/benzimidazole rings: Structural diversity and catalysis. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2019.119285] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Cooperative Reactivity by Pincer-Type Complexes Possessing Secondary Coordination Sphere. TOP ORGANOMETAL CHEM 2020. [DOI: 10.1007/3418_2020_65] [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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Elwell CE, Neisen BD, Tolman WB. Copper Complexes of Multidentate Carboxamide Ligands. Inorganica Chim Acta 2019; 485:131-139. [PMID: 31105329 DOI: 10.1016/j.ica.2018.10.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The copper coordination chemistry of two multidentate carboxamido ligands derived from HL1 (offering two quinolyl and one carboxamide donor) and H4L2 (with two pyridine(dicarboxamido) units linked by naphthalene spacers) was explored. The former was chosen because upon deprotonation it would provide a monoanionic mer-coordinating N-donor set that would model the putative deprotonated form of the His-brace in copper monooxygenases, while the latter was designed to bind two copper ions and enable comparisons to other systems with different ligand spacers. Upon reaction with Cu(I)-mesityl, HL1 yielded a symmetric dimer (L1Cu)2 in which each bis(quinolyl)amide ligand binds via two N-donors to one Cu(I) ion and via the third to the other Cu(I) center. Monomeric Cu(II) complexes [L 1 Cu(H 2 O) 2 ](OTf) and L 1 2 Cu were also characterized. Treatment of H4L2 with Cu(OTf)2 and excess Me4NOH (in CH3CN, pyridine/H2O, or MeOH) yielded complexes with anions of general formula [L 2 Cu 2 (X)]n-, where X = CH3CONH- (n = 1), CO3 2- (n = 2), or MeO- (n = 1). X-ray structures of these complexes revealed the (L2)4- ligand binding to two Cu(II) ions in an open paddle-wheel geometry, with an additional bridging ligand (X) completing the square planar coordination sphere of each metal ion. The open paddlewheel motif differs from the more 'open' puckered geometry seen with related ligands with different spacer units.
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Affiliation(s)
- Courtney E Elwell
- Department of Chemistry, University of Minnesota, 207 Pleasant St. SE, Minneapolis, MN 55455
| | - Benjamin D Neisen
- Department of Chemistry, University of Minnesota, 207 Pleasant St. SE, Minneapolis, MN 55455
| | - William B Tolman
- Department of Chemistry, Washington University in St. Louis, Campus Box 1134, 1 Brookings Drive, St. Louis, MO 63130
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9
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Burns KT, Marks WR, Cheung PM, Seda T, Zakharov LN, Gilbertson JD. Uncoupled Redox-Inactive Lewis Acids in the Secondary Coordination Sphere Entice Ligand-Based Nitrite Reduction. Inorg Chem 2018; 57:9601-9610. [PMID: 29608297 PMCID: PMC6102076 DOI: 10.1021/acs.inorgchem.8b00032] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Metal complexes composed of redox-active pyridinediimine (PDI) ligands are capable of forming ligand-centered radicals. In this Forum article, we demonstrate that integration of these types of redox-active sites with bioinspired secondary coordination sphere motifs produce direduced complexes, where the reduction potential of the ligand-based redox sites is uncoupled from the secondary coordination sphere. The utility of such ligand design was explored by encapsulating redox-inactive Lewis acidic cations via installation of a pendant benzo-15-crown-5 in the secondary coordination sphere of a series of Fe(PDI) complexes. Fe(15bz5PDI)(CO)2 was shown to encapsulate the redox-inactive alkali ion, Na+, causing only modest (31 mV) anodic shifts in the ligand-based redox-active sites. By uncoupling the Lewis acidic sites from the ligand-based redox sites, the pendant redox-inactive ion, Na+, can entice the corresponding counterion, NO2-, for reduction to NO. The subsequent initial rate analysis reveals an acceleration in anion reduction, confirming this hypothesis.
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Affiliation(s)
- Kyle T. Burns
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
| | - Walker R. Marks
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
| | - Pui Man Cheung
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
| | - Takele Seda
- Department of Physics, Western Washington University, Bellingham, Washington 98225, United States
| | - Lev N. Zakharov
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - John D. Gilbertson
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
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Affiliation(s)
- Paolo Pirovano
- School of Chemistry and CRANN/AMBER Nanoscience Institute; Trinity College Dublin; The University of Dublin; College Green 2 Dublin Ireland
| | - Aidan R. McDonald
- School of Chemistry and CRANN/AMBER Nanoscience Institute; Trinity College Dublin; The University of Dublin; College Green 2 Dublin Ireland
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11
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Kochem A, Molloy JK, Gellon G, Leconte N, Philouze C, Berthiol F, Jarjayes O, Thomas F. A Structurally Characterized Cu III Complex Supported by a Bis(anilido) Ligand and Its Oxidative Catalytic Activity. Chemistry 2017; 23:13929-13940. [PMID: 28742929 DOI: 10.1002/chem.201702010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Indexed: 01/23/2023]
Abstract
Three copper(II) complexes of the (R,R)-N,N'-bis(3,5-di-tert-butyl-2-aminobenzylidene)-1,2-diaminocyclohexane ligand, namely [Cu(N L)], [Cu(N LH)]+ and [Cu(N LH2 )]2+ , were prepared and structurally characterized. In [Cu(N LH2 )]2+ the copper ion lies in an octahedral geometry with the aniline groups coordinated in equatorial positions. In [Cu(N L)] the anilines are deprotonated (anilido moieties) and coordinated to an almost square-planar metal ion. Complex [Cu(N L)] displays two oxidation waves at E1/2ox, 1 =-0.14 V and E1/2ox, 2 =0.36 V vs. Fc+ /Fc in CH2 Cl2 . Complex [Cu(N LH2 )]2+ displays an irreversible oxidation wave at high potential (1.21 V), but shows a readily accessible and reversible metal-centered reduction at E1/2red =-0.67 V (CuII /CuI redox couple). Oxidation of [Cu(N L)] by AgSbF6 produces [Cu(N L)](SbF6 ), which was isolated as single crystals. X-ray structure analysis discloses a contraction of the coordination sphere by 0.05 Å upon oxidation, supporting a metal-centered process. Complex [Cu(N L)](SbF6 ) displays an intense NIR band at 1260 nm corresponding to an anilido-to-copper(III) charge transfer transition. This compound slowly evolves in CH2 Cl2 solution towards [Cu(N LH)](SbF6 ), which is a copper(II) complex comprised of both anilido and aniline groups coordinated to the metal center. The copper(III) complex [Cu(N L)](SbF6 ) is an efficient catalyst for benzyl alcohol oxidation, with 236 TON in 24 h at 298 K, without additives other than oxygen and a base.
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Affiliation(s)
- Amélie Kochem
- Département de Chimie Moléculaire, UMR-5250, Université Grenoble Alpes, BP 53, 38041, Grenoble Cedex 9, France
| | - Jennifer K Molloy
- Département de Chimie Moléculaire, UMR-5250, Université Grenoble Alpes, BP 53, 38041, Grenoble Cedex 9, France
| | - Gisèle Gellon
- Département de Chimie Moléculaire, UMR-5250, Université Grenoble Alpes, BP 53, 38041, Grenoble Cedex 9, France
| | - Nicolas Leconte
- Département de Chimie Moléculaire, UMR-5250, Université Grenoble Alpes, BP 53, 38041, Grenoble Cedex 9, France
| | - Christian Philouze
- Département de Chimie Moléculaire, UMR-5250, Université Grenoble Alpes, BP 53, 38041, Grenoble Cedex 9, France
| | - Florian Berthiol
- Département de Chimie Moléculaire, UMR-5250, Université Grenoble Alpes, BP 53, 38041, Grenoble Cedex 9, France
| | - Olivier Jarjayes
- Département de Chimie Moléculaire, UMR-5250, Université Grenoble Alpes, BP 53, 38041, Grenoble Cedex 9, France
| | - Fabrice Thomas
- Département de Chimie Moléculaire, UMR-5250, Université Grenoble Alpes, BP 53, 38041, Grenoble Cedex 9, France
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12
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Tseberlidis G, Intrieri D, Caselli A. Catalytic Applications of Pyridine-Containing Macrocyclic Complexes. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700633] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Giorgio Tseberlidis
- Department of Chemistry; Università degli Studi di Milano and ISTM-CNR-Milano; Via Golgi 19 20133 Milan Italy
| | - Daniela Intrieri
- Department of Chemistry; Università degli Studi di Milano and ISTM-CNR-Milano; Via Golgi 19 20133 Milan Italy
| | - Alessandro Caselli
- Department of Chemistry; Università degli Studi di Milano and ISTM-CNR-Milano; Via Golgi 19 20133 Milan Italy
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13
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Bortoluzzi M, Bresciani G, Marchetti F, Pampaloni G, Zacchini S. Synthesis and structural characterization of mixed halide–N,N-diethylcarbamates of group 4 metals, including a case of unusual tetrahydrofuran activation. NEW J CHEM 2017. [DOI: 10.1039/c6nj03489f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A straightforward synthesis of dichloride-dicarbamates of group 4 metals consists of the metathesis reaction of the respective tetrahalides with tetracarbamates.
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Affiliation(s)
- Marco Bortoluzzi
- Ca’ Foscari University of Venice
- Dipartimento di Scienze Molecolari e Nanosistemi
- I-30175 Mestre
- Italy
- CIRCC
| | - Giulio Bresciani
- University of Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56124 Pisa
- Italy
| | - Fabio Marchetti
- CIRCC
- I-70126 Bari
- Italy
- University of Pisa
- Dipartimento di Chimica e Chimica Industriale
| | - Guido Pampaloni
- CIRCC
- I-70126 Bari
- Italy
- University of Pisa
- Dipartimento di Chimica e Chimica Industriale
| | - Stefano Zacchini
- CIRCC
- I-70126 Bari
- Italy
- University of Bologna
- Dipartimento di Chimica Industriale “Toso Montanari”
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14
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Kumar P, Gupta R. The wonderful world of pyridine-2,6-dicarboxamide based scaffolds. Dalton Trans 2016; 45:18769-18783. [DOI: 10.1039/c6dt03578g] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This perspective focusses on a variety of scaffolds based on a pyridine-2,6-dicarboxamide fragment and their noteworthy roles in coordination chemistry, biomimetic studies, catalysis, and sensing.
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Affiliation(s)
- Pramod Kumar
- Department of Chemistry
- University of Delhi
- Delhi-110007
- India
| | - Rajeev Gupta
- Department of Chemistry
- University of Delhi
- Delhi-110007
- India
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15
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Wallen CM, Wielizcko M, Bacsa J, Scarborough CC. Heterotrimetallic sandwich complexes supported by sulfonamido ligands. Inorg Chem Front 2016. [DOI: 10.1039/c5qi00233h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
CoII complexes bearing sulfonamido ligands derived from tris(2-aminoethyl)amine (H6tren) assemble into complex architectures in the presence of Group II ions through interactions between the Group II ion and the sulfonyl oxygens.
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Affiliation(s)
| | | | - John Bacsa
- Department of Chemistry
- Emory University
- Atlanta
- USA
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16
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Delgado M, Ziegler JM, Seda T, Zakharov LN, Gilbertson JD. Pyridinediimine Iron Complexes with Pendant Redox-Inactive Metals Located in the Secondary Coordination Sphere. Inorg Chem 2015; 55:555-7. [PMID: 26692111 DOI: 10.1021/acs.inorgchem.5b02544] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of pyridinediimine (PDI) iron complexes that contain a pendant 15-crown-5 located in the secondary coordination sphere were synthesized and characterized. The complex Fe((15c5)PDI)(CO)2 (2) was shown in both the solid state and solution to encapsulate redox-inactive metal ions. Modest shifts in the reduction potential of the metal-ligand scaffold were observed upon encapsulation of either Na(+) or Li(+).
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Affiliation(s)
| | | | | | - Lev N Zakharov
- Department of Chemistry, University of Oregon , Eugene, Oregon 97403, United States
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17
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Byrne JP, Kitchen JA, Gunnlaugsson T. The btp [2,6-bis(1,2,3-triazol-4-yl)pyridine] binding motif: a new versatile terdentate ligand for supramolecular and coordination chemistry. Chem Soc Rev 2015; 43:5302-25. [PMID: 24871484 DOI: 10.1039/c4cs00120f] [Citation(s) in RCA: 128] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Ligands containing the btp [2,6-bis(1,2,3-triazol-4-yl)pyridine] motif have appeared with increasing regularity over the last decade. This class of ligands, formed in a one pot ‘click’ reaction, has been studied for various purposes, such as for generating d and f metal coordination complexes and supramolecular self-assemblies, and in the formation of dendritic and polymeric networks, etc. This review article introduces btp as a novel and highly versatile terdentate building block with huge potential in inorganic supramolecular chemistry. We will focus on the coordination chemistry of btp ligands with a wide range of metals, and how it compares with other classical pyridyl and polypyridyl based ligands, and then present a selection of applications including use in catalysis, enzyme inhibition, photochemistry, molecular logic and materials, e.g. polymers, dendrimers and gels. The photovoltaic potential of triazolium derivatives of btp and its interactions with anions will also be discussed.
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Affiliation(s)
- Joseph P Byrne
- School of Chemistry and Trinity Biomedical Sciences Institute, Trinity College Dublin, University of Dublin, Pearse St, Dublin 2, Ireland.
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18
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Guillet GL, Gordon JB, Di Francesco GN, Calkins MW, Čižmár E, Abboud KA, Meisel MW, García-Serres R, Murray LJ. A Family of Tri- and Dimetallic Pyridine Dicarboxamide Cryptates: Unusual O,N,O-Coordination and Facile Access to Secondary Coordination Sphere Hydrogen Bonding Interactions. Inorg Chem 2015; 54:2691-704. [DOI: 10.1021/ic502873d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Gary L. Guillet
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Jesse B. Gordon
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Gianna N. Di Francesco
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Matthew W. Calkins
- Department
of Physics and the National High Magnetic Field Laboratory, University of Florida, Gainesville, Florida 32611-8440, United States
| | - Erik Čižmár
- Institute
of Physics, Faculty of Science, P.J. Šafárik University, 04154 Košice, Slovakia
| | - Khalil A. Abboud
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Mark W. Meisel
- Department
of Physics and the National High Magnetic Field Laboratory, University of Florida, Gainesville, Florida 32611-8440, United States
| | - Ricardo García-Serres
- Laboratoire
de Chimie de Biologie des Métaux, UMR 5249, Université Joseph Fourier, Grenoble-1, CNRS-CEA, 17 Rue des Martyrs, 38054 Grenoble Cedex 9, France
| | - Leslie J. Murray
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
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19
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Dhar D, Tolman WB. Hydrogen atom abstraction from hydrocarbons by a copper(III)-hydroxide complex. J Am Chem Soc 2015; 137:1322-9. [PMID: 25581555 PMCID: PMC4311965 DOI: 10.1021/ja512014z] [Citation(s) in RCA: 135] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Indexed: 12/17/2022]
Abstract
With the aim of understanding the basis for the high rate of hydrogen atom abstraction (HAT) from dihydroanthracene (DHA) by the complex LCuOH (1; L = N,N'-bis(2,6-diisopropylphenyl)-2,6-pyridinedicarboxamide), the bond dissociation enthalpy of the reaction product LCu(H2O) (2) was determined through measurement of its pK(a) and E(1/2) in THF solution. In so doing, an equilibrium between 2 and LCu(THF) was characterized by UV-vis and EPR spectroscopy and cyclic voltammetry (CV). A high pK(a) of 18.8 ± 1.8 and a low E(1/2) of -0.074 V vs Fc/Fc(+) in THF combined to yield an O-H BDE for 2 of 90 ± 3 kcal mol(-1) that is large relative to values for most transition metal oxo/hydroxo complexes. By taking advantage of the increased stability of 1 observed in 1,2-difluorobenzene (DFB) solvent, the kinetics of the reactions of 1 with a range of substrates with varying BDE values for their C-H bonds were measured. The oxidizing power of 1 was revealed through the accelerated decay of 1 in the presence of the substrates, including THF (BDE = 92 kcal mol(-1)) and cyclohexane (BDE = 99 kcal mol(-1)). CV experiments in THF solvent showed that 1 reacted with THF via rate-determining attack at the THF C-H(D) bonds with a kinetic isotope effect of 10.2. Analysis of the kinetic and thermodynamic data provides new insights into the basis for the high reactivity of 1 and the possible involvement of species like 1 in oxidation catalysis.
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Affiliation(s)
- Debanjan Dhar
- Department of Chemistry and
Center for Metals in Biocatalysis, University
of Minnesota, 207 Pleasant
Street SE, Minneapolis, Minnesota 55455, United States
| | - William B. Tolman
- Department of Chemistry and
Center for Metals in Biocatalysis, University
of Minnesota, 207 Pleasant
Street SE, Minneapolis, Minnesota 55455, United States
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20
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Santra S, Mukherjee S, Bej S, Saha S, Ghosh P. Amino-ether macrocycle that forms CuII templated threaded heteroleptic complexes: a detailed selectivity, structural and theoretical investigations. Dalton Trans 2015; 44:15198-211. [DOI: 10.1039/c5dt00596e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Self-sorting behavior of a newly synthesized macrocycle with divalent metal ions and aromatic ligands via pseudorotaxane formation has been described.
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Affiliation(s)
- Saikat Santra
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Sandip Mukherjee
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Somnath Bej
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Subrata Saha
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Pradyut Ghosh
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
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21
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Omoto K, Tashiro S, Kuritani M, Shionoya M. Multipoint recognition of ditopic aromatic guest molecules via Ag-π interactions within a dimetal macrocycle. J Am Chem Soc 2014; 136:17946-9. [PMID: 25479363 DOI: 10.1021/ja5106249] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A macrocyclic host molecule possessing a nanocavity with two Ag(I) centers for guest binding and four anthracene walls has been developed. This dimetal-macrocycle forms stable inclusion complexes with ditopic aromatic guest molecules, [2.2]paracyclophane, and ferrocene, in solution and/or in the solid state through Ag-π interactions within the nanocavity. The binding constants for the inclusion complexes were found to range roughly from 10(4) to 10(9) M(-1). Electrochemical measurement revealed that the oxidized form of the included cationic ferrocene was less stabilized due to the direct binding to the cationic two Ag(I) centers.
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Affiliation(s)
- Kenichiro Omoto
- Department of Chemistry, Graduate School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
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22
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Mognon L, Benet-Buchholz J, Rahaman SMW, Bo C, Llobet A. Ru–Zn Heteropolynuclear Complexes Containing a Dinucleating Bridging Ligand: Synthesis, Structure, and Isomerism. Inorg Chem 2014; 53:12407-15. [DOI: 10.1021/ic5017559] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lorenzo Mognon
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, 43007 Tarragona, Spain
| | - Jordi Benet-Buchholz
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, 43007 Tarragona, Spain
| | - S. M. Wahidur Rahaman
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, 43007 Tarragona, Spain
| | - Carles Bo
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, 43007 Tarragona, Spain
- Departament de Quı́mica
Fı́sica i Inorgànica, Universitat Rovira i Virgili, 43007 Tarragona, Spain
| | - Antoni Llobet
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, 43007 Tarragona, Spain
- Departament de Química, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain
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23
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Halvagar M, Solntsev PV, Lim H, Hedman B, Hodgson KO, Solomon E, Cramer CJ, Tolman WB. Hydroxo-bridged dicopper(II,III) and -(III,III) complexes: models for putative intermediates in oxidation catalysis. J Am Chem Soc 2014; 136:7269-72. [PMID: 24821432 PMCID: PMC4046753 DOI: 10.1021/ja503629r] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Indexed: 12/21/2022]
Abstract
A macrocyclic ligand (L(4-)) comprising two pyridine(dicarboxamide) donors was used to target reactive copper species relevant to proposed intermediates in catalytic hydrocarbon oxidations by particulate methane monooxygenase and heterogeneous zeolite systems. Treatment of LH4 with base and Cu(OAc)2·H2O yielded (Me4N)2[L2Cu4(μ4-O)] (1) or (Me4N)[LCu2(μ-OH)] (2), depending on conditions. Complex 2 was found to undergo two reversible 1-electron oxidations via cyclic voltammetry and low-temperature chemical reactions. On the basis of spectroscopy and theory, the oxidation products were identified as novel hydroxo-bridged mixed-valent Cu(II)Cu(III) and symmetric Cu(III)2 species, respectively, that provide the first precedence for such moieties as oxidation catalysis intermediates.
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Affiliation(s)
- Mohammad
Reza Halvagar
- Department
of Chemistry, Center for Metals in Biocatalysis, Chemical Theory Center,
and Minnesota Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Pavlo V. Solntsev
- Department
of Chemistry, Center for Metals in Biocatalysis, Chemical Theory Center,
and Minnesota Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Hyeongtaek Lim
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Britt Hedman
- Stanford
Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | - Keith O. Hodgson
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
- Stanford
Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | - Edward
I. Solomon
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
- Stanford
Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | - Christopher J. Cramer
- Department
of Chemistry, Center for Metals in Biocatalysis, Chemical Theory Center,
and Minnesota Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - William B. Tolman
- Department
of Chemistry, Center for Metals in Biocatalysis, Chemical Theory Center,
and Minnesota Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
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24
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Bansal D, Kumar G, Hundal G, Gupta R. Mononuclear complexes of amide-based ligands containing appended functional groups: role of secondary coordination spheres on catalysis. Dalton Trans 2014; 43:14865-75. [DOI: 10.1039/c4dt02079k] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Coordination complexes of amide-based ligands with appended heterocyclic rings create a hydrogen bonding cavity that effectively binds the substrate(s). Such cavity-based complexes function as reusable and heterogeneous catalysts for various organic transformations.
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Affiliation(s)
- Deepak Bansal
- Department of Chemistry
- University of Delhi
- Delhi-110007, India
| | - Gulshan Kumar
- Department of Chemistry
- University of Delhi
- Delhi-110007, India
| | | | - Rajeev Gupta
- Department of Chemistry
- University of Delhi
- Delhi-110007, India
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