1
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Lozada IB, Braun JD, Williams JAG, Herbert DE. Yellow-Emitting, Pseudo-Octahedral Zinc Complexes of Benzannulated N^N^O Pincer-Type Ligands. Inorg Chem 2022; 61:17568-17578. [DOI: 10.1021/acs.inorgchem.2c02585] [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)
- Issiah B. Lozada
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, ManitobaR3T 2N2, Canada
| | - Jason D. Braun
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, ManitobaR3T 2N2, Canada
| | | | - David E. Herbert
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, ManitobaR3T 2N2, Canada
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2
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Nemez DB, Lozada IB, Braun JD, Williams JAG, Herbert DE. Synthesis and Coordination Chemistry of a Benzannulated Bipyridine: 6,6'-Biphenanthridine. Inorg Chem 2022; 61:13386-13398. [PMID: 35972335 DOI: 10.1021/acs.inorgchem.2c01514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis, characterization, and coordination chemistry of a doubly π-extended bipyridine analogue, 6,6'-biphenanthridine (biphe), is presented. The structure of the molecule has been determined in the solid state by X-ray diffraction, showing an angle of 72.6° between the phenanthridine planes. The free, uncoordinated organic molecule displays blue fluorescence in solution. It can be singly protonated with strong acids, and the protonated form displays more intense yellow emission. The effect of acid on the excited states is interpreted with the aid of TDDFT calculations. Two Ru(II) coordination complexes, tris(6,6'-biphenanthridine)ruthenium(II) dichloride, [Ru(biphe)3]Cl2, and bis(2,2'-bipyridine)(6,6'-biphenanthridine)ruthenium(II) tetraphenylborate, [Ru(bpy)2(biphe)](BPh4)2, are also reported and their structures determined in the solid state by X-ray diffraction. Both complexes display emission at 77 K that is strongly bathochromically shifted by almost 200 nm compared to that of the archetypal 3MLCT emitter [Ru(bpy)3]2+. Such a red shift is consistent with the more extended conjugation and lower-energy π* orbitals associated with the biphe ligand, lowering the energy of the 3MLCT excited state, as revealed by TDDFT calculations. The efficient non-radiative decay that is typical of such low-energy emitters renders the phosphorescence extremely weak and short-lived at ambient temperature, and rapid ligand photodissociation also competes with radiative decay, especially in the heteroleptic complex. Electrochemical analysis illustrates the effect of biphe's stabilized vacant π* manifold, with multiple reversible reductions evident at much less negative potentials than those observed for [Ru(bpy)3]2+.
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Affiliation(s)
- Dion B Nemez
- 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
| | - 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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3
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Lozada IB, Williams JAG, Herbert DE. Platinum( ii) complexes of benzannulated N ∧N −∧O-amido ligands: bright orange phosphors with long-lived excited states. Inorg Chem Front 2022. [DOI: 10.1039/d1qi01120k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Benzannulated N∧N−∧O-chelating ligands enable facile formation of remarkably bright orange-emitting Pt(ii) phosphors with very long-lived excited states.
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Affiliation(s)
- 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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4
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Lozada IB, Ortiz RJ, Braun JD, Williams JAG, Herbert DE. Donor-Acceptor Boron-Ketoiminate Complexes with Pendent N-Heterocyclic Arms: Switched-on Luminescence through N-Heterocycle Methylation. J Org Chem 2021; 87:184-196. [PMID: 34936362 DOI: 10.1021/acs.joc.1c02138] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of intramolecular, donor-stabilized BF2 complexes supported by phenanthridinyl-decorated, β-ketoiminate chelating ligand scaffolds is described, along with their characterization by spectroscopy and X-ray diffraction. In solution, the relative orientation of the pendent phenanthridinyl arm is fixed despite not coordinating to the boron center, and a well-resolved through-space interaction between a phenanthridinyl C-H and a single fluorine atom can be observed by 19F-1H NOE NMR spectroscopy. The neutral compounds are nonetheless only weakly luminescent in fluid solution, ascribed to nonradiative decay pathways enabled by rotation of the N-heterocyclic unit. Methylation of the phenanthridinyl nitrogen restricts this rotation, "switching on" comparably strong emission in solution. Modeling by density functional theory (DFT) and time-dependent DFT (TDDFT) indicates that the character of the lowest energy excitation changes upon methylation, with shallow calculated potential energy surfaces of the neutral complexes consistent with their lack of significant radiative decay.
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Affiliation(s)
- Issiah B Lozada
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
| | - Robert J Ortiz
- 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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Ortiz RJ, Braun JD, Williams JAG, Herbert DE. Brightly Luminescent Platinum Complexes of N∧C-∧N Ligands Forming Six-Membered Chelate Rings: Offsetting Deleterious Ring Size Effects Using Site-Selective Benzannulation. Inorg Chem 2021; 60:16881-16894. [PMID: 34730936 DOI: 10.1021/acs.inorgchem.1c02551] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Brightly emissive platinum(II) complexes (λemission,max = 607-612 nm) of the type RLPtCl are reported, where RL is a cyclometalated N∧C-∧N-coordinating ligand derived from 1,3-di(2-trifluoromethyl-4-phenanthridinyl)benzene (CF3LH) or 1,3-di(2-tert-butyl-4-phenanthridinyl)benzene (tBuLH). Metathesis of the chlorido ligand can be achieved under mild conditions, enabling isolation of ionic compounds with the formula [CF3LPtL']PF6 where L' = pyridine or (4-dimethylamino)pyridine (DMAP), as well as the charge-neutral species tBuLPt(C≡C─C6H4─tBu) (C≡C─C6H4─tBu = 4-tert-butylphenylacetylido). Compared with N∧N∧N-ligated Pt(II) complexes that form 5-membered chelates, these compounds all contain 6-membered rings. Expanding the chelate ring size from 5 to 6 has been previously demonstrated to enhance emission in some N∧N∧N-coordinated Pt(II) species─for example, in complexes of 2,6-di(8-quinolinyl)pyridine vs those of 2,2':6',2″-terpyridine─but in related N∧C-∧N-coordinated species, luminescence quantum yields are significantly lower for the 6-membered chelate ring complexes. Here, we demonstrate that site-selective benzannulation of the quinolinyl side-arms can offset the deleterious effect of changing the chelate ring-size and boost photophysical properties such as the quantum yield. Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations suggest that benzannulation counterintuitively destabilizes the emissive triplet states compared to the smaller π-system, with the "imine-bridged biphenyl" form of the phenanthridinyl arm helping to buffer against larger molecular distortions, enhancing photoluminescence quantum yields up to 0.09 ± 0.02. The spontaneous formation under aerated conditions of a Pt(IV) derivative (CF3LPtCl3) is also reported, together with its molecular structure in the solid state.
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Affiliation(s)
- Robert J Ortiz
- 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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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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7
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Mondal R, Ortiz RJ, Braun JD, Herbert DE. Synthesis, characterization, and coordination chemistry of a phenanthridine-containing N-heterocyclic carbene ligand. CAN J CHEM 2021. [DOI: 10.1139/cjc-2020-0333] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
An N-heterocyclic carbene ligand precursor bearing a π-extended phenanthridine (3,4-benzoquinoline) unit is presented. The proligand was isolated as the imidazolium salt of chloride (1•HCl), bromide (1•HBr), or hexafluorophosphate (1•HPF6) counterions. These salts can be deprotonated and the carbene installed on silver centres using Ag2O as both a base and a source of metal ion. The resulting Ag(I) complex (1)AgCl can be used in a transmetalation reaction to generate a Pd(II) coordination complex (1)Pd(CH3CN)Cl2. The characterization and photophysical properties of these complexes is presented, along with a demonstration of the utility of (1)Pd(CH3CN)Cl2 in mediating a catalytic C-N cross-coupling reaction for the preparation of the pharmaceutical Piribedil.
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Affiliation(s)
- Rajarshi Mondal
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, MB R3T 2N2, Canada
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, MB R3T 2N2, Canada
| | - Robert J. Ortiz
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, MB R3T 2N2, Canada
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, MB R3T 2N2, Canada
| | - Jason D. Braun
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, MB R3T 2N2, Canada
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, MB R3T 2N2, Canada
| | - David E. Herbert
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, MB R3T 2N2, Canada
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, MB R3T 2N2, Canada
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8
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Braun JD, Lozada IB, Shepit M, van Lierop J, Herbert DE. Pseudo-octahedral nickel(ii) complexes of strongly absorbing benzannulated pincer-type amido ligands: ligand-based redox and non-Aufbau electronic behaviour. RSC Adv 2021; 11:3547-3555. [PMID: 35424319 PMCID: PMC8694012 DOI: 10.1039/d0ra10761a] [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: 12/22/2020] [Accepted: 01/07/2021] [Indexed: 11/21/2022] Open
Abstract
The synthesis, structures and electronic characterization of three strongly coloured, pseudo-octahedral Ni(ii) complexes supported by redox-active diarylamido ligands featuring benzannulated N-heterocyclic donor arms are reported. The S = 1 paramagnets each present two singly occupied molecular orbitals (SOMOs) identified as metal-based by density functional theory (DFT), consistent with solid-state and solution magnetism measurements. Upon applying oxidative potentials, non-Aufbau behaviour leads to the appearance of intense and well-defined absorption features extending into the near IR (NIR). The attribution of these features to the onset of aminyl radical character through ligand-based redox is corroborated by exceptionally strong intervalence charge-transfer (IVCT) transitions ascribed to electronic communication between two Namido moieties across a Ni(ii) bridge.
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Affiliation(s)
- Jason D Braun
- Department of Chemistry, University of Manitoba 144 Dysart Road Winnipeg Manitoba Canada
| | - Issiah B Lozada
- Department of Chemistry, University of Manitoba 144 Dysart Road Winnipeg Manitoba Canada
| | - Michael Shepit
- Department of Physics and Astronomy, University of Manitoba 31A Sifton Rd Winnipeg Manitoba Canada
| | - Johan van Lierop
- Department of Physics and Astronomy, University of Manitoba 31A Sifton Rd Winnipeg Manitoba Canada
- Manitoba Institute for Materials, University of Manitoba 20 Sifton Rd Winnipeg MB Canada
| | - David E Herbert
- Department of Chemistry, University of Manitoba 144 Dysart Road Winnipeg Manitoba Canada
- Manitoba Institute for Materials, University of Manitoba 20 Sifton Rd Winnipeg MB Canada
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9
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Mondal R, Braun JD, Lozada IB, Nickel R, van Lierop J, Herbert DE. Group VIII coordination complexes of bidentate P^N ligands bearing π-extended quinoline or phenanthridine N-heterocycles. NEW J CHEM 2021. [DOI: 10.1039/d1nj00254f] [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
Group 8 complexes of π-extended N-heterocyclic ligands present some unexpected results. Benzannulation shifts the lowest energy excitation to the blue by impacting the character of the transition rather than affecting frontier orbital energies.
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Affiliation(s)
| | - Jason D. Braun
- Department of Chemistry
- University of Manitoba
- Winnipeg
- Canada
| | | | - Rachel Nickel
- Department of Physics and Astronomy
- University of Manitoba
- Winnipeg
- Canada
| | - Johan van Lierop
- Department of Physics and Astronomy
- University of Manitoba
- Winnipeg
- Canada
- Manitoba Institute for Materials
| | - David E. Herbert
- Department of Chemistry
- University of Manitoba
- Winnipeg
- Canada
- Manitoba Institute for Materials
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10
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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: 16] [Impact Index Per Article: 4.0] [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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11
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Gaire S, Ortiz RJ, Schrage BR, Lozada IB, Mandapati P, Osinski AJ, Herbert DE, Ziegler CJ. (8-Amino)quinoline and (4-Amino)phenanthridine Complexes of Re(CO) 3 Halides. J Organomet Chem 2020; 921. [PMID: 32831401 DOI: 10.1016/j.jorganchem.2020.121338] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
In this report, we present a study on the synthesis, structure, and electronics of a series of (8-amino)quinoline and (4-amino)phenanthridine complexes of Re(CO)3X, where X = Cl and Br. In all cases, the (amino)heterocycles bind as bidentate ligands, with surprisingly symmetric modes of binding based on Re-N bond lengths. Between the complexes of (8-amino)quinolines and (4-amino)phenanthridines studied in this report, we do not observe much structural variation, and remarkably similar UV-visible absorption spectra. Expansion of the π-system in the (4-amino)phenanthridine complexes does result in an increase in the intensity of the lowest energy transitions (λmax), which computational modeling suggests are more purely MLCT in character compared with the mixed π-π*/MLCT character of these transitions in the smaller (8-amino)quinoline-supported complexes. DFT and TDDFT modeling further showed that consideration of spin-orbit coupling (SOC) is essential; omitting SOC misses the π-π* contributions to λmax and is unable to accurately model the observed electronic absorption spectra.
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Affiliation(s)
- Sanjay Gaire
- Department of Chemistry, University of Akron, Akron, Ohio 44312-3601, United States
| | - Robert J Ortiz
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba, R3T 2N2, Canada
| | - Briana R Schrage
- Department of Chemistry, University of Akron, Akron, Ohio 44312-3601, United States
| | - Issiah B Lozada
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba, R3T 2N2, Canada
| | - Pavan Mandapati
- Department of Chemistry and the Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba, R3T 2N2, Canada
| | - Allen J Osinski
- Department of Chemistry, University of Akron, Akron, Ohio 44312-3601, United States
| | - 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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12
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Synthesis, luminescence studies and structural characterization of new Co(II) and Cu(II) complexes based on phenanthridine as a ligand. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119553] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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13
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Mandapati P, Braun JD, Sidhu BK, Wilson G, Herbert DE. Catalytic C–H Bond Alkylation of Azoles with Alkyl Halides Mediated by Nickel(II) Complexes of Phenanthridine-Based N^N–^N Pincer Ligands. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00161] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pavan Mandapati
- Department of Chemistry and the Manitoba Institute of Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
| | - Jason D. Braun
- Department of Chemistry and the Manitoba Institute of Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
| | - Baldeep K. Sidhu
- Department of Chemistry and the Manitoba Institute of Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
| | - Gabrielle Wilson
- Department of Chemistry and the Manitoba Institute of Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
| | - David E. Herbert
- Department of Chemistry and the Manitoba Institute of Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
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14
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Mondal R, Herbert DE. Synthesis of Pyridines, Quinolines, and Pyrimidines via Acceptorless Dehydrogenative Coupling Catalyzed by a Simple Bidentate P^N Ligand Supported Ru Complex. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00058] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rajarshi Mondal
- 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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15
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Lozada IB, Huang B, Stilgenbauer M, Beach T, Qiu Z, Zheng Y, Herbert DE. Monofunctional platinum(ii) anticancer complexes based on multidentate phenanthridine-containing ligand frameworks. Dalton Trans 2020; 49:6557-6560. [DOI: 10.1039/d0dt01275k] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Pt(ii) complexes supported by chelating, multidentate ligands containing phenanthridine heterocycles are reported and shown to exhibit a superior in vitro therapeutic index compared with phenanthriplatin and cisplatin.
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Affiliation(s)
- Issiah B. Lozada
- Department of Chemistry and the Manitoba Institute for Materials
- University of Manitoba
- Winnipeg
- Canada
| | - Bin Huang
- Department of Chemistry and the Manitoba Institute for Materials
- University of Manitoba
- Winnipeg
- Canada
| | | | - Travis Beach
- Department of Chemistry
- Kent State University
- Kent
- USA
| | - Zihan Qiu
- Department of Chemistry
- Kent State University
- Kent
- USA
| | | | - David E. Herbert
- Department of Chemistry and the Manitoba Institute for Materials
- University of Manitoba
- Winnipeg
- Canada
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16
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Braun JD, Lozada IB, Kolodziej C, Burda C, Newman KME, van Lierop J, Davis RL, Herbert DE. Iron(II) coordination complexes with panchromatic absorption and nanosecond charge-transfer excited state lifetimes. Nat Chem 2019; 11:1144-1150. [PMID: 31740761 DOI: 10.1038/s41557-019-0357-z] [Citation(s) in RCA: 102] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 09/23/2019] [Indexed: 11/09/2022]
Abstract
Replacing current benchmark rare-element photosensitizers with ones based on abundant and low-cost metals such as iron would help facilitate the large-scale implementation of solar energy conversion. To do so, the ability to extend the lifetimes of photogenerated excited states of iron complexes is critical. Here, we present a sensitizer design in which iron(II) centres are supported by frameworks containing benzannulated phenanthridine and quinoline heterocycles paired with amido donors. These complexes exhibit panchromatic absorption and nanosecond charge-transfer excited state lifetimes, enabled by the combination of vacant, energetically accessible heterocycle-based acceptor orbitals and occupied molecular orbitals destabilized by strong mixing between amido nitrogen atoms and iron. This finding shows how ligand design can extend metal-to-ligand charge-transfer-type excited state lifetimes of iron(II) complexes into the nanosecond regime and expand the range of potential applications for iron-based photosensitizers.
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Affiliation(s)
- Jason D Braun
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Issiah B Lozada
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Charles Kolodziej
- Department of Chemistry, Case Western Reserve University, Cleveland, OH, USA
| | - Clemens Burda
- Department of Chemistry, Case Western Reserve University, Cleveland, OH, USA
| | - Kelly M E Newman
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Johan van Lierop
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada.,Manitoba Institute for Materials, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Rebecca L Davis
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada
| | - David E Herbert
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada. .,Manitoba Institute for Materials, University of Manitoba, Winnipeg, Manitoba, Canada.
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17
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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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18
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Dunning SG, Reynolds JE, Walsh KM, Kristek DJ, Lynch VM, Kunal P, Humphrey SM. Direct, One-Pot Syntheses of MOFs Decorated with Low-Valent Metal-Phosphine Complexes. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00319] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Samuel G. Dunning
- Department of Chemistry, The University of Texas at Austin, 100 East 24th Street, Stop A1590, Austin, Texas 78712, United States
| | - Joseph E. Reynolds
- Department of Chemistry, The University of Texas at Austin, 100 East 24th Street, Stop A1590, Austin, Texas 78712, United States
| | - Kelly M. Walsh
- Department of Chemistry, The University of Texas at Austin, 100 East 24th Street, Stop A1590, Austin, Texas 78712, United States
| | - David J. Kristek
- Department of Chemistry, The University of Texas at Austin, 100 East 24th Street, Stop A1590, Austin, Texas 78712, United States
| | - Vincent M. Lynch
- Department of Chemistry, The University of Texas at Austin, 100 East 24th Street, Stop A1590, Austin, Texas 78712, United States
| | - Pranaw Kunal
- Department of Chemistry, The University of Texas at Austin, 100 East 24th Street, Stop A1590, Austin, Texas 78712, United States
| | - Simon M. Humphrey
- Department of Chemistry, The University of Texas at Austin, 100 East 24th Street, Stop A1590, Austin, Texas 78712, United States
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19
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Zisti F, Alizadeh R, Azhdari Tehrani A, Morsali A, Eichhorn SH, Rawson JM, Xiao HP. Synthesis, characterization and single crystal X-ray analysis of Zn(II) phenanthridine complexes. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.01.002] [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]
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20
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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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21
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Mondal R, Lozada IB, Davis RL, Williams JAG, Herbert DE. Site-Selective Benzannulation of N-Heterocycles in Bidentate Ligands Leads to Blue-Shifted Emission from [(P^N)Cu]2(μ-X)2 Dimers. Inorg Chem 2018; 57:4966-4978. [DOI: 10.1021/acs.inorgchem.7b03223] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rajarshi Mondal
- 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
| | - 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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22
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Braun C, Nieger M, Bräse S. Unprecedented One-Pot Reaction towards Chiral, Non-Racemic Copper(I) Complexes of [2.2]Paracyclophane-Based P,N
-Ligands. Chemistry 2017; 23:16452-16455. [DOI: 10.1002/chem.201704115] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Indexed: 01/20/2023]
Affiliation(s)
- Carolin Braun
- Institute of Organic Chemistry; Karlsruhe Institute of Technology (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe Germany
| | - Martin Nieger
- Department of Chemistry; University of Helsinki, P.O. Box 55; 00014 University of Helsinki Finland
| | - Stefan Bräse
- Institute of Organic Chemistry; Karlsruhe Institute of Technology (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe Germany
- Institute of Toxicology and Genetics; Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
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23
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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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