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Fleming C, Vu S, Brook DJR, Agrestini S, Pellegrin E, DaRos J. Metal-ligand interactions in a redox active ligand system. Electrochemistry and spectroscopy of [M(dipyvd) 2] n+ (M=Zn, Ni, n=0, 1, 2). Front Chem 2023; 11:1295289. [PMID: 38033468 PMCID: PMC10684738 DOI: 10.3389/fchem.2023.1295289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Accepted: 10/27/2023] [Indexed: 12/02/2023] Open
Abstract
Reaction of nickel and zinc triflates with the tridentate leucoverdazyl 1-isopropyl-3,5-di (2'-pyridyl)-6-oxo-2H-tetrazine (dipyvdH) and triethylamine resulted in the neutral coordination compounds M(dipyvd)2 (M = Ni,Zn). In acetonitrile, both compounds undergo two one electron oxidation processes, Zn (dipyvd)2 at -0.28 V and -0.12 V and Ni(dipyvd)2 at -0.32 V and -0.15 V vs ferrocene/ferricenium. Oxidations are ligand based resulting in an intermediate mixed valence species and a cationic bis(verdazyl) compound respectively. Oxidation of the ligand changes a localized, antiaromatic, non-planar 8π electron anion to a planar, delocalized 7π electron radical. The change in ligand structure results in an increase in the octahedral ligand field splitting from 10,500 cm-1 to ∼13,000 cm-1, suggesting an increase in the pi acceptor character of the ligand. In the mixed valence species, spectroscopic data suggests minimal interaction between ligands mediated by the metal center; i.e., these are class I-II systems in the Robin-Day classification.
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Affiliation(s)
- Connor Fleming
- Department of Chemistry, San Jose State University, San Jose, CA, United States
| | - Son Vu
- Department of Chemistry, San Jose State University, San Jose, CA, United States
| | - David J. R. Brook
- Department of Chemistry, San Jose State University, San Jose, CA, United States
| | - Stefano Agrestini
- ALBA Synchrotron Light Source, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - Eric Pellegrin
- ALBA Synchrotron Light Source, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - Jeffrey DaRos
- Department of Chemistry, San Jose State University, San Jose, CA, United States
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2
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Roseiro P, Yalouz S, Brook DJR, Ben Amor N, Robert V. Modifications of Tanabe-Sugano d6 Diagram Induced by Radical Ligand Field: Ab Initio Inspection of a Fe(II)-Verdazyl Molecular Complex. Inorg Chem 2023; 62:5737-5743. [PMID: 36971364 DOI: 10.1021/acs.inorgchem.3c00275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
Quantum entanglement between the spin states of a metal center and radical ligands is suggested in an iron(II) [Fe(dipyvd)2]2+ compound (dipyvd = 1-isopropyl-3,5-dipyridil-6-oxoverdazyl). Wave function ab initio (Difference Dedicated Configuration Interaction, DDCI) inspections were carried out to stress the versatility of local spin states. We named this phenomenon excited state spinmerism, in reference to our previous work (see Roseiro et al., ChemPhysChem 2022, e202200478) where we introduced the concept of spinmerism as an extension of mesomerism to spin degrees of freedom. The construction of localized molecular orbitals allows for a reading of the wave functions and projections onto the local spin states. The low-energy spectrum is well-depicted by a Heisenberg picture. A 60 cm-1 ferromagnetic interaction is calculated between the radical ligands with the Stotal = 0 and 1 states largely dominated by a local low-spin SFe = 0. In contrast, the higher-lying Stotal = 2 states are superpositions of the local SFe = 1 (17%, 62%) and SFe = 2 (72%, 21%) spin states. Such mixing extends the traditional picture of a high-field d6 Tanabe-Sugano diagram. Even in the absence of spin-orbit coupling, the avoided crossing between different local spin states is triggered by the field generated by radical ligands. This puzzling scenario emerges from versatile local spin states in compounds which extend the traditional views in molecular magnetism.
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3
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Lipunova GN, Fedorchenko TG, Chupakhin ON. Verdazyls in Coordination Chemistry. RUSS J COORD CHEM+ 2022. [DOI: 10.1134/s1070328422070065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Fleming C, Chung D, Ponce S, Brook DJR, DaRos J, Das R, Ozarowski A, Stoian SA. Valence tautomerism in a cobalt-verdazyl coordination compound. Chem Commun (Camb) 2020; 56:4400-4403. [PMID: 32242582 DOI: 10.1039/d0cc01770a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Coordination of 1-isopropyl-3,5-dipyridyl-6-oxoverdazyl to cobalt results in a dication best described in the solid state as a high spin cobalt(ii) ion coordinated to two radical ligands with an S = 3/2 ground state. On dissolution in acetonitrile, the cobalt(ii) form equilibrates with a cobalt(iii) valence tautomer with an S = 1/2 ground state.
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Affiliation(s)
- Connor Fleming
- Department of Chemistry, San Jose State University, One Washington Square, San Jose, CA 95126, USA.
| | - Dorothy Chung
- Department of Chemistry, San Jose State University, One Washington Square, San Jose, CA 95126, USA.
| | - Servando Ponce
- Department of Chemistry, San Jose State University, One Washington Square, San Jose, CA 95126, USA.
| | - David J R Brook
- Department of Chemistry, San Jose State University, One Washington Square, San Jose, CA 95126, USA.
| | - Jeffrey DaRos
- Department of Chemistry, San Jose State University, One Washington Square, San Jose, CA 95126, USA.
| | - Raja Das
- Department of Physics, University of South Florida, Tampa, Florida 33620, USA
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA
| | - Sebastian A Stoian
- Department of Chemistry, University of Idaho, 875 Perimeter Drive, Moscow, ID 83844, USA
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5
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Sanz CA, Patrick BO, Hicks RG. Synthesis and redox chemistry of Pd(ii) complexes of a pincer verdazyl ligand. Dalton Trans 2019; 48:12674-12683. [PMID: 31384845 DOI: 10.1039/c9dt02549a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of palladium(ii) complexes containing a redox-active, tridentate verdazyl ligand of general formula (verdazyl)PdL (L = Cl, CH3CN) are synthesized. The tetrazine core of tridentate verdazyl ligand 5 is flanked by two pyridyl groups, creating a geometry in which the ancillary ligand L is bound trans to the verdazyl ring in the square planar metal complexes. Pd(ii) complexes were isolated with the verdazyl ligand in either its neutral radical charge state (6: L = CH3CN, 12: L = Cl) or its closed-shell monoanionic charge state (10: L = CH3CN, 9: L = Cl). The charge state of the ligand was determined using X-ray crystallography and NMR, EPR, and IR spectroscopy. The cyclic voltammograms of radical complexes 6 and 12 each contain a reversible one-electron reduction wave and an irreversible one-electron oxidation wave. The complexes can be chemically interconverted between radical ligand (6, 12) and reduced, closed-shell anion (9, 10) using decamethylferrocene as the reductant and a mixture of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone and fluoroboric acid as the oxidant.
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Affiliation(s)
- Corey A Sanz
- Department of Chemistry, University of Victoria, PO Box 3065 STN CSC, Victoria, B.C. V8W3V6, Canada.
| | - Brian O Patrick
- Crystallography Laboratory, Department of Chemistry, University of British Columbia, Vancouver, BC V6T1Z1, Canada
| | - Robin G Hicks
- Department of Chemistry, University of Victoria, PO Box 3065 STN CSC, Victoria, B.C. V8W3V6, Canada.
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6
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Kyoden Y, Homma Y, Ishida T. High-Spin and Incomplete Spin-Crossover Polymorphs in Doubly Chelated [Ni(L) 2Br 2] (L = tert-Butyl 5-Phenyl-2-pyridyl Nitroxide). Inorg Chem 2019; 58:10743-10755. [PMID: 31368687 DOI: 10.1021/acs.inorgchem.9b00885] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Complexation of nickel(II) bromide with tert-butyl 5-phenyl-2-pyridyl nitroxide (phpyNO) gave two morphs of doubly chelated [Ni(phpyNO)2Br2] as a 2p-3d-2p heterospin triad. The α phase crystallizes in the orthorhombic space group Pbcn. An asymmetric unit involves a half-molecule. The torsion angle around Ni-O-N-C2py is as small as 6.5(3)° at 100 K and 7.0(6)° at 400 K, guaranteeing an orthogonal arrangement between the magnetic radical π* and metal 3dx2-y2 and 3dz2 orbitals. Magnetic study revealed the high-spin ground state with the exchange coupling constant 2J/kB = +288(5) K, on the basis of a symmetrical spin Hamiltonian. The β phase crystallizes in the monoclinic space group P21/n. The whole molecule is an independent unit. The Ni-O-N-C2py torsion angles are 24.2(6) and 37.2(5)° at 100 K and 10.4(7) and 25.9(6)° at 400 K. A magnetic study revealed a very gradual and nonhysteretic spin transition. An analysis based on the van't Hoff equation gave a successful fit with the spin-crossover temperature of 134(1) K, although the susceptibility did not reach the theoretical high-spin value at 400 K. Density functional theory calculation on the β phase showed ground Stotal = 0 in the low-temperature structure while Stotal = 2 in the high-temperature structure, supporting the synchronized exchange coupling switch on both sides. Consequently, the β phase can be recognized as an "incomplete spin crossover" material, as a result of conflicting thermal depopulation effects in a high-temperature region.
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Affiliation(s)
- Yukiya Kyoden
- Department of Engineering Science , The University of Electro-Communications , Chofu, Tokyo 182-8585 , Japan
| | - Yuta Homma
- Department of Engineering Science , The University of Electro-Communications , Chofu, Tokyo 182-8585 , Japan
| | - Takayuki Ishida
- Department of Engineering Science , The University of Electro-Communications , Chofu, Tokyo 182-8585 , Japan
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7
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Lakma A, Hossain SM, van Leusen J, Kögerler P, Singh AK. Tetranuclear Mn II, Co II, Cu II and Zn II grid complexes of an unsymmetrical ditopic ligand: synthesis, structure, redox and magnetic properties. Dalton Trans 2019; 48:7766-7777. [PMID: 31066416 DOI: 10.1039/c9dt01041f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Synthesis towards the preparation of an unsymmetrical binucleating Schiff-base ligand, (H2L) is discussed. It has been synthesized by reacting methyl 6-(hydrazinecarbonyl)picolinate with 2-hydroxy acetophenone. The ligand (H2L) comprises two different asymmetric binding pockets; however, when reacted with Mn(ii), Co(ii), Cu(ii) and Zn(ii) salts, very stable self-assembled [2 × 2] grid complexes form regardless of the employed metal-to-ligand ratio. The obtained complexes [Mn4L4]·(CH3CN) (1), [Co4L4]·(CHCl3) (2), [Cu4L4]·(CHCl3) (3) and [Zn4L4] (4) have been fully characterized by physicochemical methods, including ESI mass spectrometry and X-ray crystallographic analyses, and their EPR, magnetic and redox properties are discussed. All discussed complexes self-assembled in a 'head-to-tail' fashion leading to [2 × 2] grid architectures. Mn, Co and Cu grid complexes show weak to moderate antiferromagnetic coupling among the four metal centers. The high stability of the grid structures is in line with the lack of any observable dissociation or exchange between metal ions in solution. Complexes 1 and 2 show four quasi-reversible to irreversible oxidative responses in cyclic voltammograms at a glassy carbon working electrode in 1,2-dichlorobenzene and at a platinum working electrode in dichloromethane, respectively.
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Affiliation(s)
- Avinash Lakma
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar 752 050, India.
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8
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Shimizu D, Ide Y, Ikeue T, Osuka A. Coordination‐Induced Spin‐State Switching of an Aminyl‐Radical‐Bridged Nickel(II) Porphyrin Dimer between Doublet and Sextet States. Angew Chem Int Ed Engl 2019; 58:5023-5027. [PMID: 30761702 DOI: 10.1002/anie.201900792] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Indexed: 12/18/2022]
Affiliation(s)
- Daiki Shimizu
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo-ku Kyoto 606-8502 Japan
| | - Yuki Ide
- Interdisciplinary Graduate School of Science and EngineeringShimane University, Nishikawatsu-Cho Matsue 690-8504 Japan
| | - Takahisa Ikeue
- Interdisciplinary Graduate School of Science and EngineeringShimane University, Nishikawatsu-Cho Matsue 690-8504 Japan
| | - Atsuhiro Osuka
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo-ku Kyoto 606-8502 Japan
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9
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Shimizu D, Ide Y, Ikeue T, Osuka A. Coordination‐Induced Spin‐State Switching of an Aminyl‐Radical‐Bridged Nickel(II) Porphyrin Dimer between Doublet and Sextet States. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900792] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Daiki Shimizu
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo-ku Kyoto 606-8502 Japan
| | - Yuki Ide
- Interdisciplinary Graduate School of Science and EngineeringShimane University, Nishikawatsu-Cho Matsue 690-8504 Japan
| | - Takahisa Ikeue
- Interdisciplinary Graduate School of Science and EngineeringShimane University, Nishikawatsu-Cho Matsue 690-8504 Japan
| | - Atsuhiro Osuka
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo-ku Kyoto 606-8502 Japan
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10
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Brook DJR, Fleming C, Chung D, Richardson C, Ponce S, Das R, Srikanth H, Heindl R, Noll BC. An electron transfer driven magnetic switch: ferromagnetic exchange and spin delocalization in iron verdazyl complexes. Dalton Trans 2018; 47:6351-6360. [PMID: 29652414 DOI: 10.1039/c8dt00805a] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The verdazyl 'pincer' ligand, 1-isopropyl-3,5-dipyridyl-6-oxoverdazyl (dipyvd), coordinates iron to form a series of pseudooctahedral coordination compounds [Fe(dipyvd)2]n+ (n = 0-3). In the case where n = 2, the molecular geometry and physical and spectral properties are consistent with a low spin (S = 0) iron(ii) ion coordinated by two ferromagnetically coupled radical ligands. Upon one electron reduction, the room temperature effective magnetic moment of the complex jumps from μeff = 2.64 to μeff = 5.86 as a result of spin crossover of the iron atom combined with very strong ferromagnetic coupling of the remaining ligand centered unpaired electron with the metal center. The sign of the exchange is opposite to that observed in other high spin iron/radical ligand systems and appears to be a result of delocalization of the ligand unpaired electron across the whole molecule. The large change in magnetic properties, combined with a delocalized electronic structure and accessible redox potentials, suggests the utility of this and related systems in the development of novel molecular spintronic devices.
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Affiliation(s)
- David J R Brook
- Department of Chemistry, San José State University, One Washington Square, San José, CA 95192, USA.
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11
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Lemes MA, Stein HN, Gabidullin B, Robeyns K, Clérac R, Murugesu M. Probing Magnetic-Exchange Coupling in Supramolecular Squares Based on Reducible Tetrazine-Derived Ligands. Chemistry 2018; 24:4259-4263. [PMID: 29430742 DOI: 10.1002/chem.201800126] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Indexed: 12/12/2022]
Abstract
Reducible 3,6-bis(3,5-dimethyl-pyrazolyl)1,2,4,5-tetrazine was employed to isolate supramolecular air-stable [Co4 ] and [Zn4 ] squares, which were achieved via careful selection of counterions rather than the use of reducing agents. Magnetic susceptibility studies revealed a strong radical-CoII exchange coupling (Jrad-Co /hc=-118 cm-1 , -2J formalism) with a spin ground state of ST =4, whereas the unreduced analogue revealed negligible coupling between the Co centers (JCo-Co /hc=-0.64 cm-1 ). Radical-radical coupling was also probed in the [Zn4 ] congener, which led to Jrad-rad /hc=-15.9(5) cm-1 . These results highlight the versatile air-stable coordination chemistry of tetrazine and the importance of exploiting easily reducible delocalized radical to promote strong exchange coupling between spin carriers.
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Affiliation(s)
- Maykon A Lemes
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, D'lorio Hall, 10 Marie Curie, Ottawa, ON, K1N6N5, Canada
| | - Hilarie N Stein
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, D'lorio Hall, 10 Marie Curie, Ottawa, ON, K1N6N5, Canada
| | - Bulat Gabidullin
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, D'lorio Hall, 10 Marie Curie, Ottawa, ON, K1N6N5, Canada
| | - Koen Robeyns
- Institute of Condensed Matter and Nanosciences, MOST-Inorganic Chemistry, Université catholique de Louvain, Place L. Pasteur 1, 1348, Louvain-la-Neuve, Belgium
| | - Rodolphe Clérac
- CNRS, CRPP, UMR 5031, 33600, Pessac, France.,Univ. Bordeaux, CRPP, UMR 5031, 33600, Pessac, France
| | - Muralee Murugesu
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, D'lorio Hall, 10 Marie Curie, Ottawa, ON, K1N6N5, Canada
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12
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Woods TJ, Stout HD, Dolinar BS, Vignesh KR, Ballesteros-Rivas MF, Achim C, Dunbar KR. Strong Ferromagnetic Exchange Coupling Mediated by a Bridging Tetrazine Radical in a Dinuclear Nickel Complex. Inorg Chem 2017; 56:12094-12097. [PMID: 28945087 DOI: 10.1021/acs.inorgchem.7b01812] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The radical bridged compound [(Ni(TPMA))2-μ-bmtz•-](BF4)3·3CH3CN (bmtz = 3,6-bis(2'-pyrimidyl)-1,2,4,5-tetrazine, TPMA = tris(2-pyridylmethyl)amine) exhibits strong ferromagnetic exchange between the S = 1 NiII centers and the bridging S = 1/2 bmtz radical with J = 96 ± 5 cm-1 (-2JNi-radSNiSrad). DFT calculations support the existence of strong ferromagnetic exchange.
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Affiliation(s)
- Toby J Woods
- Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States
| | - Heather D Stout
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Brian S Dolinar
- Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States
| | - Kuduva R Vignesh
- Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States
| | | | - Catalina Achim
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Kim R Dunbar
- Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States
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13
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Lemes MA, Brunet G, Pialat A, Ungur L, Korobkov I, Murugesu M. Strong ferromagnetic exchange coupling in a {Ni} cluster mediated through an air-stable tetrazine-based radical anion. Chem Commun (Camb) 2017; 53:8660-8663. [PMID: 28718476 DOI: 10.1039/c7cc04554a] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A planar tetradentate 3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine (BpymTz) templating chelate affords the formation of an unprecedented BpymTz˙- radical anion bridged {Ni} complex. Detailed magnetic measurements performed on the isolated air stable [Ni(BpymTz˙-)Cl6(DMF)8]Cl·0.5(H2O) compound reveal strong ferromagnetic NiII-BpymTz˙- interactions with a coupling constant of J = 98.84 cm-1.
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Affiliation(s)
- Maykon A Lemes
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, ON K1N 6N5, Canada.
| | - Gabriel Brunet
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, ON K1N 6N5, Canada.
| | - Amélie Pialat
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, ON K1N 6N5, Canada.
| | - Liviu Ungur
- Theory of Nanomaterials Group and INPC - Institute for Nanoscale Physics and Chemistry, Katholieke Universitiet Leuven, Celestijnenlaan, 200F, 3001 Leuven, Belgium
| | - Ilia Korobkov
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, ON K1N 6N5, Canada.
| | - Muralee Murugesu
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, ON K1N 6N5, Canada.
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14
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Le T, Trevisan T, Lieu E, Brook DJR. Suzuki–Miyaura Coupling of Verdazyl Radicals. European J Org Chem 2017. [DOI: 10.1002/ejoc.201601483] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Thanh‐Ngoc Le
- Department of Chemistry San Jose State University One Washington Square 95126 San Jose CA USA
| | - Theresa Trevisan
- Department of Chemistry San Jose State University One Washington Square 95126 San Jose CA USA
| | - Elizabeth Lieu
- Department of Chemistry San Jose State University One Washington Square 95126 San Jose CA USA
| | - David J. R. Brook
- Department of Chemistry San Jose State University One Washington Square 95126 San Jose CA USA
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15
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Yao XN, Du JZ, Zhang YQ, Leng XB, Yang MW, Jiang SD, Wang ZX, Ouyang ZW, Deng L, Wang BW, Gao S. Two-Coordinate Co(II) Imido Complexes as Outstanding Single-Molecule Magnets. J Am Chem Soc 2016; 139:373-380. [DOI: 10.1021/jacs.6b11043] [Citation(s) in RCA: 278] [Impact Index Per Article: 34.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Xiao-Nan Yao
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Rare Earth Materials Chemistry and Applications, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, PR China
| | - Jing-Zhen Du
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of
Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, PR China
| | - Yi-Quan Zhang
- Jiangsu
Key Laboratory for NSLSCS, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, PR China
| | - Xue-Bing Leng
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of
Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, PR China
| | - Mu-Wen Yang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Rare Earth Materials Chemistry and Applications, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, PR China
| | - Shang-Da Jiang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Rare Earth Materials Chemistry and Applications, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, PR China
| | - Zhen-Xing Wang
- Wuhan
National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Zhong-Wen Ouyang
- Wuhan
National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Liang Deng
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of
Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, PR China
| | - Bing-Wu Wang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Rare Earth Materials Chemistry and Applications, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, PR China
| | - Song Gao
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Rare Earth Materials Chemistry and Applications, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, PR China
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16
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Bonanno NM, Lough AJ, Prosser KE, Walsby CJ, Poddutoori PK, Lemaire MT. A stable open-shell redox active ditopic ligand. Dalton Trans 2016; 45:5460-3. [PMID: 26966736 DOI: 10.1039/c5dt04061b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein we describe the synthesis, structure and electronic properties of an unusual redox-active ditopic ligand with a stable open-shell configuration. This stable phenoxyl radical features intense and very low energy electronic transitions in the near infrared (NIR) part of the spectrum and is structurally set up to strongly spin couple coordinated transition metal ions in [2 × 2] grid-type structures.
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Affiliation(s)
- N M Bonanno
- Department of Chemistry, Brandon University, Brandon, MB R7A 6A9, Canada.
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17
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Zhai B, Li ZY, Zhang FQ, Li SZ, Zhang FL, Zhang C, Zhang XF, Cao GX, Ma Y. Syntheses, Crystal Structures, and Magnetic Properties of Two Mononuclear Nickel-Nitronyl Nitroxide Radical Compounds. Z Anorg Allg Chem 2016. [DOI: 10.1002/zaac.201600002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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18
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Kawakami H, Tonegawa A, Ishida T. A designed room-temperature triplet ligand from pyridine-2,6-diyl bis(tert-butyl nitroxide). Dalton Trans 2016; 45:1306-9. [PMID: 26615801 DOI: 10.1039/c5dt04218f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The magnetic study on newly developed 4-mesitylpyridine-2,6-diyl bis(tert-butyl nitroxide) shows that almost the whole population has a ground triplet state at room temperature, and the ability of complex formation as a tridentate triplet ligand was proven with a diamagnetic yttrium(iii) ion.
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Affiliation(s)
- Hinako Kawakami
- Department of Engineering Science, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan.
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Eberle B, Damjanović M, Enders M, Leingang S, Pfisterer J, Krämer C, Hübner O, Kaifer E, Himmel HJ. Radical Monocationic Guanidino-Functionalized Aromatic Compounds (GFAs) as Bridging Ligands in Dinuclear Metal Acetate Complexes: Synthesis, Electronic Structure, and Magnetic Coupling. Inorg Chem 2016; 55:1683-96. [DOI: 10.1021/acs.inorgchem.5b02614] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Benjamin Eberle
- Ruprecht-Karls-Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Marko Damjanović
- Ruprecht-Karls-Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Markus Enders
- Ruprecht-Karls-Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Simone Leingang
- Ruprecht-Karls-Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Jessica Pfisterer
- Ruprecht-Karls-Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Christoph Krämer
- Ruprecht-Karls-Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Olaf Hübner
- Ruprecht-Karls-Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Elisabeth Kaifer
- Ruprecht-Karls-Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Hans-Jörg Himmel
- Ruprecht-Karls-Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
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Wang C, Lin SY, Shi W, Cheng P, Tang J. Exploiting verdazyl radicals to assemble 2p–3d–4f one-dimensional chains. Dalton Trans 2015; 44:5364-8. [DOI: 10.1039/c4dt03354j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Exploiting the coordination abilities of an isopropyl substituted verdazyl radical to transition metal and lanthanide(iii) ions represents an efficient approach to produce a system incorporating 2p, 3d and 4f spin carriers.
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Affiliation(s)
- Chao Wang
- State Key Laboratory of Rare Earth Resource Utilization
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Shuang-Yan Lin
- State Key Laboratory of Rare Earth Resource Utilization
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Wei Shi
- Department of Chemistry
- Key Laboratory of Advanced Energy Material Chemistry (MOE)
- and Tianjin Co-Innovation Center of Chemical Science and Engineering
- Nankai University
- Tianjin 300071
| | - Peng Cheng
- Department of Chemistry
- Key Laboratory of Advanced Energy Material Chemistry (MOE)
- and Tianjin Co-Innovation Center of Chemical Science and Engineering
- Nankai University
- Tianjin 300071
| | - Jinkui Tang
- State Key Laboratory of Rare Earth Resource Utilization
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
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22
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Du FX, Hu P, Gao YY, Xiao FP, Wu YN. A hydroxyl-containing nitronyl nitroxide radical and its Gd(III), Tb(III) Dy(III) complexes: Synthesis, structure and magnetic properties. INORG CHEM COMMUN 2014. [DOI: 10.1016/j.inoche.2014.08.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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23
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Demir S, Nippe M, Gonzalez MI, Long JR. Exchange coupling and magnetic blocking in dilanthanide complexes bridged by the multi-electron redox-active ligand 2,3,5,6-tetra(2-pyridyl)pyrazine. Chem Sci 2014. [DOI: 10.1039/c4sc02154a] [Citation(s) in RCA: 125] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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Price JT, Paquette JA, Harrison CS, Bauld R, Fanchini G, Gilroy JB. 6-Oxoverdazyl radical polymers with tunable electrochemical properties. Polym Chem 2014. [DOI: 10.1039/c4py00829d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
6-Oxoverdazyl radical polymers were synthesized and their tunable redox properties studied in solution and the solid-state.
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Affiliation(s)
- Jacquelyn T. Price
- Department of Chemistry
- The University of Western Ontario
- London N6A 5B7, Canada
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
| | - Joseph A. Paquette
- Department of Chemistry
- The University of Western Ontario
- London N6A 5B7, Canada
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
| | - Christopher S. Harrison
- Department of Chemistry
- The University of Western Ontario
- London N6A 5B7, Canada
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
| | - Reg Bauld
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London N6A 5B7, Canada
- Department of Physics and Astronomy
- The University of Western Ontario
| | - Giovanni Fanchini
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London N6A 5B7, Canada
- Department of Physics and Astronomy
- The University of Western Ontario
| | - Joe B. Gilroy
- Department of Chemistry
- The University of Western Ontario
- London N6A 5B7, Canada
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
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Olivos Suarez AI, Lyaskovskyy V, Reek JNH, van der Vlugt JI, de Bruin B. Komplexe mit Stickstoffradikalliganden: Einteilung, spektroskopische Eigenschaften, Reaktivität und katalytische Anwendungen. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201301487] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Suarez AIO, Lyaskovskyy V, Reek JNH, van der Vlugt JI, de Bruin B. Complexes with Nitrogen-Centered Radical Ligands: Classification, Spectroscopic Features, Reactivity, and Catalytic Applications. Angew Chem Int Ed Engl 2013; 52:12510-29. [DOI: 10.1002/anie.201301487] [Citation(s) in RCA: 208] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Indexed: 01/07/2023]
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27
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Lipunova GN, Fedorchenko TG, Chupakhin ON. Verdazyls: synthesis, properties, application. RUSSIAN CHEMICAL REVIEWS 2013. [DOI: 10.1070/rc2013v082n08abeh004341] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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28
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Hu P, Zhang C, Gao Y, Li Y, Ma Y, Li L, Liao D. Lanthanide–radical linear chain compounds based on 2,4,4,5,5-pentamethylimidazoline-1-oxyl-3-oxide: Structure and magnetic properties. Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2012.12.025] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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29
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Shuvaev KV, Sproules S, Rautiainen JM, McInnes EJL, Collison D, Anson CE, Powell AK. A self-assembled Cu(ii)4[2 × 2] grid with organic radicals. Dalton Trans 2013; 42:2371-81. [DOI: 10.1039/c2dt31946b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Johnston CW, McKinnon SDJ, Patrick BO, Hicks RG. The first “Kuhn verdazyl” ligand and comparative studies of its PdCl2 complex with analogous 6-oxoverdazyl ligands. Dalton Trans 2013; 42:16829-36. [DOI: 10.1039/c3dt52191e] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Cooper W Johnston
- Department of Chemistry, University of Victoria, PO Box 3065 STN CSC, Victoria, BC V8W 3V6, Canada.
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Bancerz M, Georges MK. Effects of N1 and N5 alkyl substituents on the stability of 6-oxoverdazyl radicals. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.10.031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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32
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Bancerz M, Youn B, DaCosta MV, Georges MK. A hydrazine- and phosgene-free synthesis of tetrazinanones, precursors to 1,5-dialkyl-6-oxoverdazyl radicals. J Org Chem 2012; 77:2415-21. [PMID: 22313449 DOI: 10.1021/jo300027b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A complementary approach to published synthetic methods for tetrazinanones, precursors to verdazyl radicals, is described herein. This approach uses carbohydrazide, a commercially available reagent, as a common starting material. Unlike previous methods described in the literature, this synthetic scheme does not rely on phosgene, phosgene substitutes, or the limited pool of commercially available monosubstituted hydrazines for its execution. A large variety of alkyl substitution patterns at the N-1 and N-5 positions of verdazyl radicals are possible, including both symmetrically and unsymmetrically substituted products. An initial condensation reaction of carbohydrazide with a specific aldehyde introduces the desired C-3 substituent in the final verdazyl radical product and protects the NH(2) groups during the subsequent N-1 and N-5 alkylation reactions. A succeeding methanolysis and concomitant ring-closing reaction gives the tetrazinanone. A number of known oxidation methods can then be employed to form the final verdazyl radical product.
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Affiliation(s)
- Matthew Bancerz
- Department of Chemical and Physical Sciences, University of Toronto at Mississauga, 3359 Mississauga Road, Mississauga, Ontario, Canada, L5L 1C6
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Vérot M, Bréfuel N, Pécaut J, Train C, Robert V. Seeking Hidden Magnetic Phenomena by Theoretical Means in a Thiooxoverdazyl Adduct. Chem Asian J 2011; 7:380-6. [DOI: 10.1002/asia.201100736] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Indexed: 11/06/2022]
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Bancerz M, Georges MK. Verdazyl Radicals as Substrates for Organic Synthesis: A Synthesis of 3-Methyl-5-aryl-1,3,4-oxadiazolones. J Org Chem 2011; 76:6377-82. [DOI: 10.1021/jo200820g] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Matthew Bancerz
- Department of Chemical and Physical Sciences, University of Toronto at Mississauga, 3359 Mississauga Road, Mississauga, Ontario, Canada L5L 1C6
| | - Michael K. Georges
- Department of Chemical and Physical Sciences, University of Toronto at Mississauga, 3359 Mississauga Road, Mississauga, Ontario, Canada L5L 1C6
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