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Gajecki L, Sawicka B, Berg DJ, Oliver AG. Synthesis and Magnetic Studies of Two Neutral, Bis-Ligand Fe(II) Complexes Containing Carbazole- Bis(tetrazole) Ligands. Inorg Chem 2023. [PMID: 37478316 DOI: 10.1021/acs.inorgchem.3c01167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/23/2023]
Abstract
Previously reported carbazole-bis(tetrazole) (CzTR) ligands (where R = iPr and CH2-2,4,6-C6H2Me3) were used to synthesize air-stable, six-coordinate, octahedral bis-ligand Fe(II) complexes (CzTR)2Fe. The synthesis and characterization of these complexes using 1H nuclear magnetic resonance (NMR), X-ray crystallography, Mössbauer spectroscopy, and density functional theory (DFT) calculations are reported. Analysis of the magnetic properties revealed that the isopropyl derivative displays thermally induced spin crossover (SCO) over a temperature range of 150-350 K. This transition appears as an abrupt two-step transition in the solid state but simplifies to a smooth one-step transition in solution. The two-step transition in the solid state has been postulated to be due to lattice and solvation effects. In contrast, the slightly bulkier substituted CH2-2,4,6-C6H2Me3 (CH2Mes) Fe complex displays dramatically different magnetic behavior with no SCO and magnetic data suggesting low-spin Fe(II) with a possible TIP contribution. DFT calculations support the postulate that the change in magnetic behavior is primarily due to the nature of the ligand substituents.
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Affiliation(s)
- Leah Gajecki
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia, Canada V8W 3V6
| | - Barbara Sawicka
- Department of Mechanical Engineering, University of Victoria, P.O. Box 1700 STN CSC, Victoria, British Columbia, Canada V8W 2Y2
| | - David J Berg
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia, Canada V8W 3V6
| | - Allen G Oliver
- Department of Chemistry & Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
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2
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Bhattacharjee A, Brown DSV, Virca CN, Ethridge TE, Mendez Galue O, Pham UT, McCormick TM. Computational investigation into intramolecular hydrogen bonding controlling the isomer formation and pKa of octahedral nickel (II) proton reduction catalysts. Dalton Trans 2022; 51:3676-3685. [DOI: 10.1039/d2dt00043a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work demonstrates the impact of intramolecular hydrogen bonding (H-bonding) on the calculated pKa of octahedral tris-(pyridinethiolato)nickel (II), [Ni(PyS)3]-, proton reduction catalysts. Density Functional Theory (DFT) calculations on a [Ni(PyS)3]-...
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3
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Sudharsan M, Nethaji M, Bhuvanesh NS, Suresh D. Heteroleptic Palladium(II) Complexes of Thiazolinyl‐picolinamide Derived N
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N
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N Pincer Ligand: An Efficient Catalyst for Acylative Suzuki Coupling Reactions. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100490] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Murugesan Sudharsan
- Department of Chemistry School of Chemical and Biotechnology SASTRA Deemed University Thanjavur Tamil Nadu 613 401 India
| | - Munirathinam Nethaji
- Department of Inorganic and Physical Chemistry Indian Institute of Science Bangalore Karnataka 560 012 India
| | | | - Devarajan Suresh
- Department of Chemistry School of Chemical and Biotechnology SASTRA Deemed University Thanjavur Tamil Nadu 613 401 India
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4
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Sidhu BK, Braun JD, Herbert DE. P–C Bond Activation and Transfer of a Diphenylphosphino Unit from 1,1′-Bis(diphenylphosphino)ferrocene: Unexpected Templated Synthesis of an N ∧N –∧P Pincer Ligand Palladium Complex. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Baldeep K. Sidhu
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
| | - Jason D. Braun
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
| | - David E. Herbert
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
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5
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Samanta S, Zheng C, Gajecki L, Berg DJ, Oliver AG, Crosby T, Godin L, Sandhu J. Carbazolyl- bis(triazole) and Carbazolyl- bis(tetrazole) Complexes of Palladium(II) and Platinum(II). J COORD CHEM 2021. [DOI: 10.1080/00958972.2021.1882674] [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]
Affiliation(s)
- Samya Samanta
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
| | - Cameron Zheng
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
| | - Leah Gajecki
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
| | - David J. Berg
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
| | - Allen G. Oliver
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Tristan Crosby
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
| | - Logan Godin
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
| | - Jaylene Sandhu
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
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6
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Mandapati P, Braun JD, Lozada IB, Williams JAG, Herbert DE. Deep-Red Luminescence from Platinum(II) Complexes of N^ N-^ N-Amido Ligands with Benzannulated N-Heterocyclic Donor Arms. Inorg Chem 2020; 59:12504-12517. [PMID: 32808773 DOI: 10.1021/acs.inorgchem.0c01584] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A synthetic methodology for accessing narrow-band, deep-red phosphorescence from mononuclear Pt(II) complexes is presented. These charge-neutral complexes have the general structure (N^N-^N)PtCl, in which the Pt(II) centers are supported by benzannulated diarylamido ligand scaffolds bearing substituted quinolinyl and/or phenanthridinyl arms. Emission maxima ranging from 683 to 745 nm are observed, with lifetimes spanning from 850 to 4500 ns. In contrast to the corresponding proligands, benzannulation is found to counterintuitively but markedly blue-shift emission from metal complexes with differing degrees of ligand benzannulation but similar substitution patterns. This effect can be further tuned by incorporation of electron-releasing (Me, tBu) or electron-withdrawing (CF3) substituents in either the phenanthridine 2-position or quinoline 6-position. Compared with symmetric bis(quinoline) and bis(phenanthridine) architectures, "mixed" ligands incorporating one quinoline and one phenanthridine unit present a degree of charge transfer between the N-heterocyclic arms that is more pronounced in the proligands than in the Pt(II) complexes. The impact of benzannulation and ring-substitution on the structure and photophysical properties of both the proligands and their deep-red emitting Pt(II) complexes is discussed.
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Affiliation(s)
- Pavan Mandapati
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba, R3T 2N2, Canada
| | - Jason D Braun
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba, R3T 2N2, Canada
| | - Issiah B Lozada
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba, R3T 2N2, Canada
| | | | - David E Herbert
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba, R3T 2N2, Canada
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7
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Mandapati P, Braun JD, Killeen C, Davis RL, Williams JAG, Herbert DE. Luminescent Platinum(II) Complexes of N^N–^N Amido Ligands with Benzannulated N-Heterocyclic Donor Arms: Quinolines Offer Unexpectedly Deeper Red Phosphorescence than Phenanthridines. Inorg Chem 2019; 58:14808-14817. [DOI: 10.1021/acs.inorgchem.9b02480] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Pavan Mandapati
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
| | - Jason D. Braun
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
| | - Charles Killeen
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
| | - Rebecca L. Davis
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
| | | | - David E. Herbert
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
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8
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Monomeric zinc(II) amide complexes supported by bidentate, benzannulated phenanthridine amido ligands. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.01.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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9
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Onunga DO, Jaganyi D, Mambanda A. The role of 8-quinolinyl moieties in tuning the reactivity of palladium(II) complexes: a kinetic and mechanistic study. J COORD CHEM 2019. [DOI: 10.1080/00958972.2019.1573994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Daniel O. Onunga
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Deogratius Jaganyi
- School of Science, College of Science and Technology, University of Rwanda, Kigali, Rwanda
- Department of Chemistry, Faculty of Applied Sciences, Durban University of Technology, Durban, South Africa
| | - Allen Mambanda
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa
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10
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Ghannam J, Al Assil T, Pankratz TC, Lord RL, Zeller M, Lee WT. A Series of 4- and 5-Coordinate Ni(II) Complexes: Synthesis, Characterization, Spectroscopic, and DFT Studies. Inorg Chem 2018; 57:8307-8316. [DOI: 10.1021/acs.inorgchem.8b00958] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jack Ghannam
- Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, Illinois 60660, United States
| | - Talal Al Assil
- Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, Illinois 60660, United States
| | - Trey C. Pankratz
- Department of Chemistry, Grand Valley State University, Allendale, Michigan 49401, United States
| | - Richard L. Lord
- Department of Chemistry, Grand Valley State University, Allendale, Michigan 49401, United States
| | - Matthias Zeller
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Wei-Tsung Lee
- Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, Illinois 60660, United States
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11
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Gleiter R, Haberhauer G, Werz DB, Rominger F, Bleiholder C. From Noncovalent Chalcogen-Chalcogen Interactions to Supramolecular Aggregates: Experiments and Calculations. Chem Rev 2018; 118:2010-2041. [PMID: 29420879 DOI: 10.1021/acs.chemrev.7b00449] [Citation(s) in RCA: 200] [Impact Index Per Article: 33.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This review considers noncovalent bonds between divalent chalcogen centers. In the first part we present X-ray data taken from the solid state structures of dimethyl- and diphenyl-dichalcogenides as well as oligoalkynes kept by alkyl-sulfur, -selenium, and -tellurium groups. Furthermore, we analyzed the solid state structures of medium sized (12-24 ring size) selenium coronands and medium to large rings with alkyne and alkene units between two chalcogen centers. The crystal structures of the cyclic structures revealed columnar stacks with close contacts between neighboring rings via noncovalent interactions between the chalcogen centers. To get larger space within the cavities, rings with diyne units between the chalcogen centers were used. These molecules showed channel-like structures in the solid state. The flexibility of the rings permits inclusion of guest molecules such as five-membered heterocycles and aromatic six-membered rings. In the second part we discuss the results of quantum chemical calculations. To treat properly the noncovalent bonding between chalcogens, we use diffuse augmented split valence basis sets in combination with electron correlation methods. Our model substances were 16 dimers consisting of two Me-X-Me (X = O, S, Se, Te) pairs and dimers of Me-X-Me/Me-X-CN (X = O, S, Se, Te) pairs. The calculations show the anticipated increase of the interaction energy from (Me-O-Me)2 (-2.15 kcal/mol) to (Me-O-Me/Me-Te-CN) (-6.59 kcal/mol). An analysis by the NBO method reveals that in the case of the chalcogen centers O and S the hydrogen bridges between the molecules dominate. However, in the case of Se and Te the major bonding between the pairs originates from dispersion forces between the chalcogen centers. It varies between -1.7 and -4.0 kcal/mol.
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Affiliation(s)
- Rolf Gleiter
- Organisch-Chemisches Institut, Universität Heidelberg , Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Gebhard Haberhauer
- Institut für Organische Chemie, Universität Duisburg-Essen , Universitätsstraße 7, D-45117 Essen, Germany
| | - Daniel B Werz
- Institut für Organische Chemie, Technische Universität Braunschweig , Hagenring 30, D-38106 Braunschweig, Germany
| | - Frank Rominger
- Organisch-Chemisches Institut, Universität Heidelberg , Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Christian Bleiholder
- Department of Chemistry and Biochemistry & Institute of Molecular Biophysics, Florida State University , Tallahassee, Florida 32306-4390, United States
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12
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Subramaniyan V, Mani G. Synthesis, Reactions, and Structures of Heterocycle-Tethered Boranes and Their Precursors. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00766] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vasudevan Subramaniyan
- Department of Chemistry, Indian Institute of Technology - Kharagpur, Kharagpur, West Bengal, India 721 302
| | - Ganesan Mani
- Department of Chemistry, Indian Institute of Technology - Kharagpur, Kharagpur, West Bengal, India 721 302
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13
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Amido-pincer complexes of Cu(II): Synthesis, coordination chemistry and applications in catalysis. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.03.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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14
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Nxumalo W, Dinsmore A, Mampa RM, Omondi B. Reactions and effect of N-sulfonylpyrrole yielding metal complexes: Crystal structural studies. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.03.051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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15
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Mandapati P, Giesbrecht PK, Davis RL, Herbert DE. Phenanthridine-Containing Pincer-like Amido Complexes of Nickel, Palladium, and Platinum. Inorg Chem 2017; 56:3674-3685. [DOI: 10.1021/acs.inorgchem.7b00075] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pavan Mandapati
- Department of Chemistry and the Manitoba
Institute for Materials, University of Manitoba, 144 Dysart Rd, Winnipeg, MB R3T 2N2, Canada
| | - Patrick K. Giesbrecht
- Department of Chemistry and the Manitoba
Institute for Materials, University of Manitoba, 144 Dysart Rd, Winnipeg, MB R3T 2N2, Canada
| | - Rebecca L. Davis
- Department of Chemistry and the Manitoba
Institute for Materials, University of Manitoba, 144 Dysart Rd, Winnipeg, MB R3T 2N2, Canada
| | - David E. Herbert
- Department of Chemistry and the Manitoba
Institute for Materials, University of Manitoba, 144 Dysart Rd, Winnipeg, MB R3T 2N2, Canada
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16
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Patel UN, Pandey DK, Gonnade RG, Punji B. Synthesis of Quinoline-Based NNN-Pincer Nickel(II) Complexes: A Robust and Improved Catalyst System for C–H Bond Alkylation of Azoles with Alkyl Halides. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00201] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ulhas N. Patel
- Organometallic Synthesis
and Catalysis Group, Chemical Engineering
Division, and ‡Centre for Material Characterization, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411 008, Maharashtra, India
| | - Dilip K. Pandey
- Organometallic Synthesis
and Catalysis Group, Chemical Engineering
Division, and ‡Centre for Material Characterization, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411 008, Maharashtra, India
| | - Rajesh G. Gonnade
- Organometallic Synthesis
and Catalysis Group, Chemical Engineering
Division, and ‡Centre for Material Characterization, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411 008, Maharashtra, India
| | - Benudhar Punji
- Organometallic Synthesis
and Catalysis Group, Chemical Engineering
Division, and ‡Centre for Material Characterization, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411 008, Maharashtra, India
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17
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Mondal R, Giesbrecht PK, Herbert DE. Nickel(II), copper(I) and zinc(II) complexes supported by a (4-diphenylphosphino)phenanthridine ligand. Polyhedron 2016. [DOI: 10.1016/j.poly.2015.10.051] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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18
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Wang D, Lindeman SV, Fiedler AT. Bimetallic Complexes Supported by a Redox-Active Ligand with Fused Pincer-Type Coordination Sites. Inorg Chem 2015; 54:8744-54. [PMID: 26280846 DOI: 10.1021/acs.inorgchem.5b01380] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The remarkable chemistry of mononuclear complexes featuring tridentate, meridionally chelating "pincer" ligands has stimulated the development of ligand frameworks containing multiple pincer sites. Here, the coordination chemistry of a novel pentadentate ligand (L(N3O2)) that provides two closely spaced NNO pincer-type compartments fused together at a central diarylamido unit is described. The trianionic L(N3O2) chelate supports homobimetallic structures in which each M(II) ion (M = Co, Cu, Zn) is bound in a meridional fashion by the bridging diarylamido N atom and O,N-donors of the salicyaldimine arms. The metal centers are also coordinated by a mono- or bidentate auxiliary ligand (L(aux)), resulting in complexes with the general form [M2(L(N3O2))(L(aux))2](+) (where L(aux) = 1-methyl-benzimidazole (1MeBI), 2,2'-bipyridine (bpy), 4,4'-dibromo-2,2'-bipyridine (bpy(Br2)), or (S)-2-(4-isopropyl-4,5-dihydrooxazolyl)pyridine (S-(iPr)OxPy)). The fused nature of the NNO pincer sites results in short metal-metal distances ranging from 2.70 Å for [Co2(L(N3O2)) (bpy)2](+) to 3.28 Å for [Zn2(L(N3O2)) (bpy)2](+), as revealed by X-ray crystallography. The complexes possess C2 symmetry due to the twisting of the aryl rings of the μ-NAr2 core; spectroscopic studies indicate that chiral L(aux) ligands, such as S-(iPr)OxPy, are capable of controlling the helical sense of the L(N3O2) scaffold. Since the four- or five-coordinate M(II) centers are linked solely by the amido moiety, each features an open coordination site in the intermetallic region, allowing for the possibility of metal-metal cooperativity in small-molecule activation. Indeed, the dicobalt(II) complex [Co2(L(N3O2)) (bpy(Br2))2](+) reacts with O2 to yield a dicobalt(III) species with a μ-1,2-peroxo ligand. The bpy-containing complexes exhibit rich electrochemical properties due to multiple metal- and ligand-based redox events across a wide (3.0 V) potential window. Using electron paramagnetic resonance (EPR) spectroscopy and density functional theory (DFT), it was determined that one-electron oxidation of [Co2(L(N3O2)) (bpy)2](+) results in formation of a S = 1/2 species with a L(N3O2)-based radical coupled to low-spin Co(II) centers.
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Affiliation(s)
- Denan Wang
- Department of Chemistry, Marquette University , Milwaukee, Wisconsin 53201, United States
| | - Sergey V Lindeman
- Department of Chemistry, Marquette University , Milwaukee, Wisconsin 53201, United States
| | - Adam T Fiedler
- Department of Chemistry, Marquette University , Milwaukee, Wisconsin 53201, United States
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19
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Lee CI, DeMott JC, Pell CJ, Christopher A, Zhou J, Bhuvanesh N, Ozerov OV. Ligand survey results in identification of PNP pincer complexes of iridium as long-lived and chemoselective catalysts for dehydrogenative borylation of terminal alkynes. Chem Sci 2015; 6:6572-6582. [PMID: 30090274 PMCID: PMC6054099 DOI: 10.1039/c5sc02161h] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 08/03/2015] [Indexed: 11/21/2022] Open
Abstract
Following the report on the successful use of SiNN pincer complexes of iridium as catalysts for dehydrogenative borylation of terminal alkynes (DHBTA) to alkynylboronates, this work examined a wide variety of related pincer ligands in the supporting role in DHBTA. The ligand selection included both new and previously reported ligands and was developed to explore systematic changes to the SiNN framework (the 8-(2-diisopropylsilylphenyl)aminoquinoline). Surprisingly, only the diarylamido/bis(phosphine) PNP system showed any DHBTA reactivity. The specific PNP ligand (bearing two diisopropylphosphino side donors) used in the screen showed DHBTA activity inferior to SiNN. However, taking advantage of the ligand optimization opportunities presented by the PNP system via the changes in the substitution at phosphorus led to the discovery of a catalyst whose activity, longevity, and scope far exceeded that of the original SiNN archetype. Several Ir complexes were prepared in a model PNP system and evaluated as potential intermediates in the catalytic cycle. Among them, the (PNP)Ir diboryl complex and the borylvinylidene complex were shown to be less competent in catalysis and thus likely not part of the catalytic cycle.
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Affiliation(s)
- Chun-I Lee
- Department of Chemistry , Texas A&M University , College Station , TX 77842 , USA .
| | - Jessica C DeMott
- Department of Chemistry , Texas A&M University , College Station , TX 77842 , USA .
| | - Christopher J Pell
- Department of Chemistry , Texas A&M University , College Station , TX 77842 , USA .
| | - Alyson Christopher
- Department of Chemistry , Brandeis University , MS 015, 415 South Street , Waltham , MA 02454 , USA
| | - Jia Zhou
- Department of Chemistry , Harbin Institute of Technology , Harbin 150001 , China
| | - Nattamai Bhuvanesh
- Department of Chemistry , Texas A&M University , College Station , TX 77842 , USA .
| | - Oleg V Ozerov
- Department of Chemistry , Texas A&M University , College Station , TX 77842 , USA .
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20
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Fontaine PP, Ueligger S, Klosin J, Hazari A, Daller J, Hou J. Development of Improved Amidoquinoline Polyolefin Catalysts with Ultrahigh Molecular Weight Capacity. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00053] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Philip P. Fontaine
- Performance Plastics R&D, The Dow Chemical Company, Freeport, Texas 77541, United States
| | - Steve Ueligger
- Performance Plastics R&D, The Dow Chemical Company, Freeport, Texas 77541, United States
| | - Jerzy Klosin
- Corporate R&D, The Dow Chemical Company, 1776 Building, Midland, Michigan 48674, United States
| | - Amaruka Hazari
- Corporate R&D, The Dow Chemical Company, 1776 Building, Midland, Michigan 48674, United States
| | - Joe Daller
- Corporate R&D, The Dow Chemical Company, 1776 Building, Midland, Michigan 48674, United States
| | - Jianbo Hou
- Corporate R&D, The Dow Chemical Company, 1776 Building, Midland, Michigan 48674, United States
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21
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Broere DLJ, Demeshko S, de Bruin B, Pidko EA, Reek JNH, Siegler MA, Lutz M, van der Vlugt JI. Dinuclear palladium complexes with two ligand-centered radicals and a single bridging ligand: subtle tuning of magnetic properties. Chemistry 2015; 21:5879-86. [PMID: 25735905 DOI: 10.1002/chem.201500084] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Indexed: 12/29/2022]
Abstract
The facile and tunable preparation of unique dinuclear [(L(⋅))Pd-X-Pd(L(⋅))] complexes (X = Cl or N3), bearing a ligand radical on each Pd, is disclosed, as well as their magnetochemistry in solution and solid state is reported. Chloride abstraction from [PdCl(NNO(ISQ))] (NNO(ISQ) = iminosemiquinonato) with TlPF6 results in an unusual monochlorido-bridged dinuclear open-shell diradical species, [{Pd(NNO(ISQ))}2(μ-Cl)](+), with an unusually small Pd-Cl-Pd angle (ca. 93°, determined by X-ray). This suggests an intramolecular d(8)-d(8) interaction, which is supported by DFT calculations. SQUID measurements indicate moderate antiferromagnetic spin exchange between the two ligand radicals and an overall singlet ground state in the solid state. VT EPR spectroscopy shows a transient signal corresponding to a triplet state between 20 and 60 K. Complex 2 reacts with PPh3 to generate [Pd(NNO(ISQ))(PPh3)](+) and one equivalent of [PdCl(NNO(ISQ))]. Reacting an 1:1 mixture of [PdCl(NNO(ISQ))] and [Pd(N3)(NNO(ISQ))] furnishes the 1,1-azido-bridged dinuclear diradical [{Pd(NNO(ISQ))}2(κ(1)-N;μ-N3](+), with a Pd-N-Pd angle close to 127° (X-ray). Magnetic and EPR measurements indicate two independent S = 1/2 spin carriers and no magnetic interaction in the solid state. The two diradical species both show no spin exchange in solution, likely because of unhindered rotation around the Pd-X-Pd core. This work demonstrates that a single bridging atom can induce subtle and tunable changes in structural and magnetic properties of novel dinuclear Pd complexes featuring two ligand-based radicals.
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Affiliation(s)
- Daniël L J Broere
- Homogeneous, Bioinspired & Supramolecular Catalysis van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam (The Netherlands)
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22
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Kumar R, Mani G. Exhibition of the Brønsted acid–base character of a Schiff base in palladium(ii) complex formation: lithium complexation, fluxional properties and catalysis of Suzuki reactions in water. Dalton Trans 2015; 44:6896-908. [DOI: 10.1039/c5dt00438a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Brønsted acid–base character of bis(iminopyrrolylmethyl)amine was shown through the X-ray structures of palladium complexes. The bischelated palladium complex is fluxional as studied by the VT 1H NMR method and effectively catalyzes Suzuki reactions in water.
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Affiliation(s)
- Rajnish Kumar
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur
- India
| | - Ganesan Mani
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur
- India
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23
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24
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Broere DLJ, Metz LL, de Bruin B, Reek JNH, Siegler MA, van der Vlugt JI. Redox-Active Ligand-Induced Homolytic Bond Activation. Angew Chem Int Ed Engl 2014; 54:1516-20. [DOI: 10.1002/anie.201410048] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Revised: 10/30/2014] [Indexed: 01/17/2023]
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25
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Broere DLJ, Metz LL, de Bruin B, Reek JNH, Siegler MA, van der Vlugt JI. Redox-Active Ligand-Induced Homolytic Bond Activation. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201410048] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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26
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Lüning A, Neugebauer M, Lingen V, Krest A, Stirnat K, Deacon GB, Drago PR, Ott I, Schur J, Pantenburg I, Meyer G, Klein A. Platinum Diolefin Complexes - Synthesis, Structures, and Cytotoxicity. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402954] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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27
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Kessler JA, Iluc VM. Ag(I) and Tl(I) Precursors as Transfer Agents of a Pyrrole-Based Pincer Ligand to Late Transition Metals. Inorg Chem 2014; 53:12360-71. [DOI: 10.1021/ic501600s] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Julie A. Kessler
- Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
| | - Vlad M. Iluc
- Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
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28
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Deibel N, Hohloch S, Schweinfurth D, Weisser F, Grupp A, Sarkar B. Three-way cooperativity in d8 metal complexes with ligands displaying chemical and redox non-innocence. Chemistry 2014; 20:15178-87. [PMID: 25251147 DOI: 10.1002/chem.201403276] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Indexed: 01/19/2023]
Abstract
Reversible proton- and electron-transfer steps are crucial for various chemical transformations. The electron-reservoir behavior of redox non-innocent ligands and the proton-reservoir behavior of chemically non-innocent ligands can be cooperatively utilized for substrate bond activation. Although site-decoupled proton- and electron-transfer steps are often found in enzymatic systems, generating model metal complexes with these properties remains challenging. To tackle this issue, we present herein complexes [(cod-H)M(μ-L(2-)) M(cod-H)] (M = Pt(II), [1] or Pd(II), [2], cod = 1,5-cyclooctadiene, H2L = 2,5-di-[2,6-(diisopropyl)anilino]-1,4-benzoquinone), in which cod acts as a proton reservoir, and L(2-) as an electron reservoir. Protonation of [2] leads to an unusual tetranuclear complex. However, [1] can be stepwise reversibly protonated with up to two protons on the cod-H ligands, and the protonated forms can be stepwise reversibly reduced with up to two electrons on the L(2-) ligand. The doubly protonated form of [1] is also shown to react with OMe(-) leading to an activation of the cod ligands. The site-decoupled proton and electron reservoir sources work in tandem in a three-way cooperative process that results in the transfer of two electrons and two protons to a substrate leading to its double reduction and protonation. These results will possibly provide new insights into developing catalysts for multiple proton- and electron-transfer reactions by using metal complexes of non-innocent ligands.
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Affiliation(s)
- Naina Deibel
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart (Germany)
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29
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Kinunda G, Jaganyi D. Understanding the electronic and π-conjugation roles of quinoline on ligand substitution reactions of platinum(II) complexes. TRANSIT METAL CHEM 2014. [DOI: 10.1007/s11243-014-9819-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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30
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Lee CI, Zhou J, Ozerov OV. Catalytic dehydrogenative borylation of terminal alkynes by a SiNN pincer complex of iridium. J Am Chem Soc 2013; 135:3560-6. [PMID: 23374079 DOI: 10.1021/ja311682c] [Citation(s) in RCA: 113] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Compounds with carbon-boron bonds are versatile intermediates for building more complex molecules via the elaboration of the carbon-boron bonds into other carbon-element bonds. The synthesis of carbon-boron bonds by catalytic dehydrogenative borylation of carbon-hydrogen bonds with dialkoxyboranes (RO)2BH is particularly attractive. It has been demonstrated for a variety of carbon-hydrogen bond types but not for the C(sp)-H bonds of terminal alkynes, for which hydroboration of the triple bond is a competing process. We report a new iridium catalyst that is strictly chemoselective for C-H borylation of terminal alkynes. The key to the success of this catalyst appears to be the new ancillary SiNN pincer ligand that combines amido, quinoline, and silyl donors and gives rise to structurally unusual Ir complexes. A variety of terminal alkynes (RC≡C-H) can be converted to their alkynylboronates (RC≡C-Bpin, where pin = pinacolate) in high yield and purity within minutes at ambient temperature.
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Affiliation(s)
- Chun-I Lee
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
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31
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Fontaine PP, Klosin J, McDougal NT. Hafnium Amidoquinoline Complexes: Highly Active Olefin Polymerization Catalysts with Ultrahigh Molecular Weight Capacity. Organometallics 2012. [DOI: 10.1021/om3005417] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Philip P. Fontaine
- Performance Plastics R&D, The Dow Chemical Company, Freeport, Texas 77541, United States
| | - Jerzy Klosin
- Corporate R&D, The Dow Chemical Company, 1776 Building, Midland, Michigan 48674, United States
| | - Nolan T. McDougal
- Corporate R&D, The Dow Chemical Company, Freeport, Texas 77541, United States
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32
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Koumousi ES, Zampakou M, Raptopoulou CP, Psycharis V, Beavers CM, Teat SJ, Psomas G, Stamatatos TC. First Palladium(II) and Platinum(II) Complexes from Employment of 2,6-Diacetylpyridine Dioxime: Synthesis, Structural and Spectroscopic Characterization, and Biological Evaluation. Inorg Chem 2012; 51:7699-710. [DOI: 10.1021/ic300739x] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
| | - Marianthi Zampakou
- Department of General and Inorganic
Chemistry, Faculty of Chemistry, Aristotle University of Thessaloniki, P.O. Box 135, GR-54124 Thessaloniki,
Greece
| | | | - Vassilis Psycharis
- Institute
of Materials Science, NCSR “Demokritos”, GR-153 10 Aghia Paraskevi
Attikis, Greece
| | - Christine M. Beavers
- Advanced
Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron
Road, Mail Stop 2-400, Berkeley, California 94720, United States
| | - Simon J. Teat
- Advanced
Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron
Road, Mail Stop 2-400, Berkeley, California 94720, United States
| | - George Psomas
- Department of General and Inorganic
Chemistry, Faculty of Chemistry, Aristotle University of Thessaloniki, P.O. Box 135, GR-54124 Thessaloniki,
Greece
| | - Theocharis C. Stamatatos
- Department
of Chemistry, University of Patras, GR-265
04 Patras, Greece
- Department of General and Inorganic
Chemistry, Faculty of Chemistry, Aristotle University of Thessaloniki, P.O. Box 135, GR-54124 Thessaloniki,
Greece
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33
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Birkle T, Carbayo A, Cuevas JV, García-Herbosa G, Muñoz A. Nucleophilic Attack on Coordinated Imines: The Synthesis of C-Bonded Acetylacetonates of Palladium(II) and Mechanistic Insights. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201101434] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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34
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Ghorai D, Kumar S, Mani G. Mononuclear, helical binuclear palladium and lithium complexes bearing a new pyrrole-based NNN-pincer ligand: fluxional property. Dalton Trans 2012; 41:9503-12. [DOI: 10.1039/c2dt30816a] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Preparation, properties, and reactivity of carbonylrhodium(I) complexes of di(2-pyrazolylaryl)amido-pincer ligands. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2011.08.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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36
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Affiliation(s)
- Jarl Ivar van der Vlugt
- Supramolecular & Homogeneous Catalysis, van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands, Fax: +31‐20‐5255604
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37
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Hollas AM, Gu W, Bhuvanesh N, Ozerov OV. Synthesis and Characterization of Pd Complexes of a Carbazolyl/Bis(Imine) NNN Pincer Ligand. Inorg Chem 2011; 50:3673-9. [DOI: 10.1021/ic200026p] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aaron M. Hollas
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - Weixing Gu
- 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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38
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Lindner R, van den Bosch B, Lutz M, Reek JNH, van der Vlugt JI. Tunable Hemilabile Ligands for Adaptive Transition Metal Complexes. Organometallics 2011. [DOI: 10.1021/om100804k] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Ronald Lindner
- van ’t Hoff Institute for Molecular Sciences, Supramolecular and Homogeneous Catalysis Group, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Bart van den Bosch
- van ’t Hoff Institute for Molecular Sciences, Supramolecular and Homogeneous Catalysis Group, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Martin Lutz
- Department for Crystal and Structural Chemistry, University of Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Joost N. H. Reek
- van ’t Hoff Institute for Molecular Sciences, Supramolecular and Homogeneous Catalysis Group, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Jarl Ivar van der Vlugt
- van ’t Hoff Institute for Molecular Sciences, Supramolecular and Homogeneous Catalysis Group, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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39
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Ren P, Vechorkin O, Csok Z, Salihu I, Scopelliti R, Hu X. Pd, Pt, and Ru complexes of a pincer bis(amino)amide ligand. Dalton Trans 2011; 40:8906-11. [DOI: 10.1039/c1dt10195a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Organometallic Complexes of Aminopyridines. ADVANCES IN HETEROCYCLIC CHEMISTRY 2011. [DOI: 10.1016/b978-0-12-385464-3.00003-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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41
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Mazzeo M, Strianese M, Kühl O, Peters JC. Phosphido pincer complexes of platinum: synthesis, structure and reactivity. Dalton Trans 2011; 40:9026-33. [DOI: 10.1039/c1dt10825e] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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43
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Suess DLM, Peters JC. Ligand design for site-selective installation of Pd and Pt centers to generate homo- and heteropolymetallic motifs. Chem Commun (Camb) 2010; 46:6554-6. [PMID: 20714483 DOI: 10.1039/c003163a] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The modular synthesis of a series of nitrogen-rich polydentate ligands that feature a common pincer-type framework is reported. These ligands allow for site-selective installation of palladium and platinum to give rise to bi- and trimetallic complexes that have d(8)-d(8) interactions.
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Affiliation(s)
- Daniel L M Suess
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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44
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Semeniuc RF, Reamer TJ, Smith MD. 8-Quinoline based ligands and their metallic derivatives: A structural and statistical investigation of quinoline π–π stacking interactions. NEW J CHEM 2010. [DOI: 10.1039/b9nj00547a] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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45
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Brancatelli G, Drommi D, Feminò G, Saporita M, Bottari G, Faraone F. Basicity and bulkiness effects of 1,8-diaminonaphthalene, 8-aminoquinoline and their alkylated derivatives on the different efficiencies of η5-C5H5 and η5-C5Me5 ruthenium precatalysts in allylic etherification reactions. NEW J CHEM 2010. [DOI: 10.1039/c0nj00338g] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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46
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van der Vlugt J, Reek J. Neutral Tridentate PNP Ligands and Their Hybrid Analogues: Versatile Non-Innocent Scaffolds for Homogeneous Catalysis. Angew Chem Int Ed Engl 2009; 48:8832-46. [DOI: 10.1002/anie.200903193] [Citation(s) in RCA: 380] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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47
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van der Vlugt J, Reek J. Neutrale dreizähnige PNP-Liganden und deren Hybrid-Analoga: vielseitige Liganden für die kooperative homogene Katalyse. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200903193] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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48
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Lutz M, van der Vlugt JI, Vogt D, Spek AL. A reversible solid–solid phase transition Z′=1 to Z′=6 in [Ni(OAc)(PNPtBu)]OTf. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.04.031] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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49
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Canovese L, Visentin F, Chessa G, Levi C, Nikolov P. Luminescent complexes of the zinc triad with N-substituted 8-amino-quinoline ligands: Synthesis and comparative study on the stability constants and related photophysical properties. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2009.05.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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50
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Vechorkin O, Csok Z, Scopelliti R, Hu X. Nickel Complexes of a Pincer Amidobis(amine) Ligand: Synthesis, Structure, and Activity in Stoichiometric and Catalytic CC Bond-Forming Reactions of Alkyl Halides. Chemistry 2009; 15:3889-99. [DOI: 10.1002/chem.200802059] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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