1
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Yue Z, Liu J, Baumgarten M, Wang D. Spirobifluorene Mediating the Spin-Spin Coupling of Nitronyl Nitroxide Diradicals. J Phys Chem A 2023; 127:1565-1575. [PMID: 36627248 DOI: 10.1021/acs.jpca.2c06648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
To investigate the mechanism of this spiro conjugation magnetic behavior, we designed and synthesized three diradicals─22'SBF-NN, 44'SBF-NN, and 27SBF-NN. They are bridged by spirobifluorene and nitronyl nitroxide (NN) diradicals as the spin centers. Notably, by SQUID and electron paramagnetic resonance (EPR) zero-field splitting data analyses, the 22'SBF-NN and 27SBF-NN diradicals exhibit intramolecular, distinctly antiferromagnetic (AF) coupling, with 2J(22'SBF-NN)/kB = -5.86 K and 2J(27SBF-NN)/kB = -24.6 K, respectively. The AF of 22'SBF-NN is opposite to that predicted by the spin density alternation rule based on Hund's rule. Diradical intramolecular conjugation coupling bridged by spiro-carbon conjugation is discussed, in which the 22'SBF-NN is smaller than that of 27SBF-NN, corresponding to the room-temperature EPR characterization. This spiro conjugation is weaker than the traditional planar conjugation and generally leads to a weaker spin-spin coupling in the helical biradical molecule. The EPR spectrum of the 44'SBF-NN diradical shows a deformed nine-line curve, indicating intramolecular exchange coupling. The density functional theory calculation gives a very weak coupling constant of 2Jcalc/kB = 0.06 K, with ferromagnetic (FM) interaction as the proof, which is consistent with the spin-polarized prediction. Further analysis of magnetic susceptibility χm and VT-EPR data shows that there is indeed an extremely weak FM interaction in the 44' position diradical. We find the bridge, which is a 44' substituted SBF structure, blocks the conjugation and contains a larger twist in steric hindrance, which also hampers sufficient spin density delocalization, resulting in a much weaker spin coupling interaction. Combined with the analysis of molecular orbital calculation results, the anomalous intramolecular AF coupling mechanism of 22'SBF-NN is further explained.
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Affiliation(s)
- Zheng Yue
- Anhui Key Laboratory of Advanced Building Materials, School of Materials Science and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China
| | - Jin Liu
- Anhui Key Laboratory of Advanced Building Materials, School of Materials Science and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China
| | - Martin Baumgarten
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Di Wang
- Anhui Key Laboratory of Advanced Building Materials, School of Materials Science and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China
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2
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Mikhailova MV, Dudko EM, Nasyrova DI, Akyeva AY, Syroeshkin MA, Bogomyakov AS, Artyukhova NA, Fedin MV, Gorbunov DE, Gritsan NP, Tretyakov EV, Ovcharenko VI, Egorov MP. Adamantyl-Substituted Triplet Diradical: Synthesis, Structure, Redox and Magnetic Properties. DOKLADY CHEMISTRY 2022. [DOI: 10.1134/s0012500822700148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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3
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Tretyakov EV, Ovcharenko VI, Terent'ev AO, Krylov IB, Magdesieva TV, Mazhukin DG, Gritsan NP. Conjugated nitroxide radicals. RUSSIAN CHEMICAL REVIEWS 2022. [DOI: 10.1070/rcr5025] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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4
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Tretyakov EV, Petunin PV, Zhivetyeva SI, Gorbunov DE, Gritsan NP, Fedin MV, Stass DV, Samoilova RI, Bagryanskaya IY, Shundrina IK, Bogomyakov AS, Kazantsev MS, Postnikov PS, Trusova ME, Ovcharenko VI. Platform for High-Spin Molecules: A Verdazyl-Nitronyl Nitroxide Triradical with Quartet Ground State. J Am Chem Soc 2021; 143:8164-8176. [PMID: 34019759 DOI: 10.1021/jacs.1c02938] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Thermally resistant air-stable organic triradicals with a quartet ground state and a large energy gap between spin states are still unique compounds. In this work, we succeeded to design and prepare the first highly stable triradical, consisting of oxoverdazyl and nitronyl nitroxide radical fragments, with a quartet ground state. The triradical and its diradical precursor were synthesized via a palladium-catalyzed cross-coupling reaction of diiodoverdazyl with nitronyl nitroxide-2-ide gold(I) complex. Both paramagnetic compounds were fully characterized by single-crystal X-ray diffraction analysis, superconducting quantum interference device magnetometry, EPR spectroscopy in various matrices, and cyclic voltammetry. In the diradical, the verdazyl and nitronyl nitroxide centers demonstrated full reversibility of redox process, while for the triradical, the electrochemical reduction and oxidation proceed at practically the same redox potentials, but become quasi-reversible. A series of high-level CASSCF/NEVPT2 calculations was performed to predict inter- and intramolecular exchange interactions in crystals of di- and triradicals and to establish their magnetic motifs. Based on the predicted magnetic motifs, the temperature dependences of the magnetic susceptibility were analyzed, and the singlet-triplet (135 ± 10 cm-1) and doublet-quartet (17 ± 2 and 152 ± 19 cm-1) splitting was found to be moderate. Unique high stability of synthesized verdazyl-nitronylnitroxide triradical opens new perspectives for further functionalization and design of high-spin systems with four or more spins.
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Affiliation(s)
- Evgeny V Tretyakov
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Ave. 47, Moscow 119991, Russian Federation
| | - Pavel V Petunin
- Tomsk Polytechnic University, Lenin Ave. 30, Tomsk 634050, Russian Federation
| | - Svetlana I Zhivetyeva
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of Russian Academy of Sciences, Ac. Lavrentiev Ave. 9, Novosibirsk 630090, Russian Federation
| | - Dmitry E Gorbunov
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch of Russian Academy of Sciences, Institutskaya Str. 3, Novosibirsk 630090, Russian Federation
| | - Nina P Gritsan
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch of Russian Academy of Sciences, Institutskaya Str. 3, Novosibirsk 630090, Russian Federation
| | - Matvey V Fedin
- International Tomography Center, Siberian Branch of Russian Academy of Sciences, Institutskaya Str. 3a, Novosibirsk 630090, Russian Federation
| | - Dmitri V Stass
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch of Russian Academy of Sciences, Institutskaya Str. 3, Novosibirsk 630090, Russian Federation.,Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russian Federation
| | - Rimma I Samoilova
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch of Russian Academy of Sciences, Institutskaya Str. 3, Novosibirsk 630090, Russian Federation
| | - Irina Yu Bagryanskaya
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of Russian Academy of Sciences, Ac. Lavrentiev Ave. 9, Novosibirsk 630090, Russian Federation
| | - Inna K Shundrina
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of Russian Academy of Sciences, Ac. Lavrentiev Ave. 9, Novosibirsk 630090, Russian Federation
| | - Artem S Bogomyakov
- International Tomography Center, Siberian Branch of Russian Academy of Sciences, Institutskaya Str. 3a, Novosibirsk 630090, Russian Federation
| | - Maxim S Kazantsev
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of Russian Academy of Sciences, Ac. Lavrentiev Ave. 9, Novosibirsk 630090, Russian Federation
| | - Pavel S Postnikov
- Tomsk Polytechnic University, Lenin Ave. 30, Tomsk 634050, Russian Federation
| | - Marina E Trusova
- Tomsk Polytechnic University, Lenin Ave. 30, Tomsk 634050, Russian Federation
| | - Victor I Ovcharenko
- International Tomography Center, Siberian Branch of Russian Academy of Sciences, Institutskaya Str. 3a, Novosibirsk 630090, Russian Federation
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5
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Tretyakov EV, Lomanovich KA, Bagryanskaya EG, Romanenko GV, Bogomyakov AS, Zueva EM, Petrova MM, Dmitriev AA, Gritsan NP. 2‐(8‐Iodonaphthalen‐1‐yl)‐Substituted Nitronyl Nitroxide: Suppressed Reactivity of Iodine Atom and Unusual Temperature Dynamics of the EPR Spectrum. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100138] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Evgeny V. Tretyakov
- N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky Prospect, 47 Moscow 119991 Russia
| | - Konstantin A. Lomanovich
- N. N. Vorozhtsov Institute of Organic Chemistry Siberian Branch of Russian Academy of Sciences 9 Ac. Lavrentiev Avenue Novosibirsk 630090 Russia
| | - Elena G. Bagryanskaya
- N. N. Vorozhtsov Institute of Organic Chemistry Siberian Branch of Russian Academy of Sciences 9 Ac. Lavrentiev Avenue Novosibirsk 630090 Russia
| | - Galina V. Romanenko
- International Tomography Center Siberian Branch of Russian Academy of Sciences 3a Institutskaya Str. Novosibirsk 630090 Russia
| | - Artem S. Bogomyakov
- International Tomography Center Siberian Branch of Russian Academy of Sciences 3a Institutskaya Str. Novosibirsk 630090 Russia
| | - Ekaterina M. Zueva
- Kazan National Research Technological University 68 K. Marx Str. Kazan 420015 Russia
| | - Maria M. Petrova
- Kazan National Research Technological University 68 K. Marx Str. Kazan 420015 Russia
| | - Alexey A. Dmitriev
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion Siberian Branch of Russian Academy of Sciences 3 Institutskaya Str. Novosibirsk 630090 Russia
| | - Nina P. Gritsan
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion Siberian Branch of Russian Academy of Sciences 3 Institutskaya Str. Novosibirsk 630090 Russia
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6
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Tretyakov EV, Zhivetyeva SI, Petunin PV, Gorbunov DE, Gritsan NP, Bagryanskaya IY, Bogomyakov AS, Postnikov PS, Kazantsev MS, Trusova ME, Shundrina IK, Zaytseva EV, Parkhomenko DA, Bagryanskaya EG, Ovcharenko VI. Ferromagnetically Coupled
S
=1 Chains in Crystals of Verdazyl‐Nitronyl Nitroxide Diradicals. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Evgeny V. Tretyakov
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry 9 Ac. Lavrentiev Avenue Novosibirsk 630090 Russia
- Novosibirsk State University 2 Pirogova Str. Novosibirsk 630090 Russia
| | - Svetlana I. Zhivetyeva
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry 9 Ac. Lavrentiev Avenue Novosibirsk 630090 Russia
| | - Pavel V. Petunin
- Research School of Chemistry & Applied Biomedical Sciences Tomsk Polytechnic University 30 Lenin Avenue Tomsk 634050 Russia
| | - Dmitry E. Gorbunov
- Novosibirsk State University 2 Pirogova Str. Novosibirsk 630090 Russia
- Voevodsky Institute of Chemical Kinetics and Combustions 3 Institutskaya Str. Novosibirsk 630090 Russia
| | - Nina P. Gritsan
- Novosibirsk State University 2 Pirogova Str. Novosibirsk 630090 Russia
- Voevodsky Institute of Chemical Kinetics and Combustions 3 Institutskaya Str. Novosibirsk 630090 Russia
| | - Irina Yu. Bagryanskaya
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry 9 Ac. Lavrentiev Avenue Novosibirsk 630090 Russia
- Novosibirsk State University 2 Pirogova Str. Novosibirsk 630090 Russia
| | - Artem S. Bogomyakov
- International Tomography Center 3a Institutskaya Str. Novosibirsk 630090 Russia
| | - Pavel S. Postnikov
- Research School of Chemistry & Applied Biomedical Sciences Tomsk Polytechnic University 30 Lenin Avenue Tomsk 634050 Russia
- University of Chemistry and Technology 3 Technicka 16628 Prague Czech Republic
| | - Maxim S. Kazantsev
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry 9 Ac. Lavrentiev Avenue Novosibirsk 630090 Russia
- Novosibirsk State University 2 Pirogova Str. Novosibirsk 630090 Russia
| | - Marina E. Trusova
- Research School of Chemistry & Applied Biomedical Sciences Tomsk Polytechnic University 30 Lenin Avenue Tomsk 634050 Russia
| | - Inna K. Shundrina
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry 9 Ac. Lavrentiev Avenue Novosibirsk 630090 Russia
| | - Elena V. Zaytseva
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry 9 Ac. Lavrentiev Avenue Novosibirsk 630090 Russia
- Novosibirsk State University 2 Pirogova Str. Novosibirsk 630090 Russia
| | - Dmitriy A. Parkhomenko
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry 9 Ac. Lavrentiev Avenue Novosibirsk 630090 Russia
- Novosibirsk State University 2 Pirogova Str. Novosibirsk 630090 Russia
| | - Elena G. Bagryanskaya
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry 9 Ac. Lavrentiev Avenue Novosibirsk 630090 Russia
- Novosibirsk State University 2 Pirogova Str. Novosibirsk 630090 Russia
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7
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Tretyakov EV, Zhivetyeva SI, Petunin PV, Gorbunov DE, Gritsan NP, Bagryanskaya IY, Bogomyakov AS, Postnikov PS, Kazantsev MS, Trusova ME, Shundrina IK, Zaytseva EV, Parkhomenko DA, Bagryanskaya EG, Ovcharenko VI. Ferromagnetically Coupled S=1 Chains in Crystals of Verdazyl-Nitronyl Nitroxide Diradicals. Angew Chem Int Ed Engl 2020; 59:20704-20710. [PMID: 32715591 DOI: 10.1002/anie.202010041] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Indexed: 11/09/2022]
Abstract
Thermally stable organic diradicals with a triplet ground state along with large singlet-triplet energy gap have significant potential for advanced technological applications. A series of phenylene-bridged diradicals with oxoverdazyl and nitronyl nitroxide units were synthesized via a palladium-catalyzed cross-coupling reaction of iodoverdazyls with a nitronyl nitroxide-2-ide gold(I) complex with high yields. The diradicals exhibit high stability and do not decompose in an inert atmosphere up to 180 °C. For the diradicals, both substantial AF (ΔEST ≈-64 cm-1 ) and FM (ΔEST ≥25 and 100 cm-1 ) intramolecular exchange interactions were observed. The sign of the exchange interaction is determined both by the bridging moiety (para- or meta-phenylene) and by the type of oxoverdazyl block (C-linked or N-linked). Upon crystallization, diradicals with the triplet ground state form unique one-dimensional exchange-coupled chains with strong intra- and weak inter-diradical ferromagnetic coupling.
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Affiliation(s)
- Evgeny V Tretyakov
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Ac. Lavrentiev Avenue, Novosibirsk, 630090, Russia.,Novosibirsk State University, 2 Pirogova Str., Novosibirsk, 630090, Russia
| | - Svetlana I Zhivetyeva
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Ac. Lavrentiev Avenue, Novosibirsk, 630090, Russia
| | - Pavel V Petunin
- Research School of Chemistry & Applied Biomedical Sciences, Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk, 634050, Russia
| | - Dmitry E Gorbunov
- Novosibirsk State University, 2 Pirogova Str., Novosibirsk, 630090, Russia.,Voevodsky Institute of Chemical Kinetics and Combustions, 3 Institutskaya Str., Novosibirsk, 630090, Russia
| | - Nina P Gritsan
- Novosibirsk State University, 2 Pirogova Str., Novosibirsk, 630090, Russia.,Voevodsky Institute of Chemical Kinetics and Combustions, 3 Institutskaya Str., Novosibirsk, 630090, Russia
| | - Irina Yu Bagryanskaya
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Ac. Lavrentiev Avenue, Novosibirsk, 630090, Russia.,Novosibirsk State University, 2 Pirogova Str., Novosibirsk, 630090, Russia
| | - Artem S Bogomyakov
- International Tomography Center, 3a Institutskaya Str., Novosibirsk, 630090, Russia
| | - Pavel S Postnikov
- Research School of Chemistry & Applied Biomedical Sciences, Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk, 634050, Russia.,University of Chemistry and Technology, 3 Technicka, 16628, Prague, Czech Republic
| | - Maxim S Kazantsev
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Ac. Lavrentiev Avenue, Novosibirsk, 630090, Russia.,Novosibirsk State University, 2 Pirogova Str., Novosibirsk, 630090, Russia
| | - Marina E Trusova
- Research School of Chemistry & Applied Biomedical Sciences, Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk, 634050, Russia
| | - Inna K Shundrina
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Ac. Lavrentiev Avenue, Novosibirsk, 630090, Russia
| | - Elena V Zaytseva
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Ac. Lavrentiev Avenue, Novosibirsk, 630090, Russia.,Novosibirsk State University, 2 Pirogova Str., Novosibirsk, 630090, Russia
| | - Dmitriy A Parkhomenko
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Ac. Lavrentiev Avenue, Novosibirsk, 630090, Russia.,Novosibirsk State University, 2 Pirogova Str., Novosibirsk, 630090, Russia
| | - Elena G Bagryanskaya
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Ac. Lavrentiev Avenue, Novosibirsk, 630090, Russia.,Novosibirsk State University, 2 Pirogova Str., Novosibirsk, 630090, Russia
| | - Victor I Ovcharenko
- International Tomography Center, 3a Institutskaya Str., Novosibirsk, 630090, Russia
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Aromatic nucleophilic substitution: A case study of the interaction of a lithiated nitronyl nitroxide with polyfluorinated quinoline-N-oxides. J Fluor Chem 2020. [DOI: 10.1016/j.jfluchem.2020.109613] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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9
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Tsujimoto H, Suzuki S, Kozaki M, Shiomi D, Sato K, Takui T, Okada K. Synthesis and Magnetic Properties of (Pyrrolidin-1-oxyl)-(Nitronyl Nitroxide)/(Iminonitroxide)-Dyads. Chem Asian J 2019; 14:1801-1806. [PMID: 30480369 DOI: 10.1002/asia.201801615] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 11/24/2018] [Indexed: 02/05/2023]
Abstract
Unlike extensively studied diradicals linked by π-conjugated systems, only a few studies have investigated weakly coupled diradicals linked by an sp3 carbon atom. Herein, we prepared pyrrolidin-1-oxyl-(nitronyl nitroxide)-dyad 5 and pyrrolidin-1-oxyl-iminonitroxide-dyad 6. From the observed temperature dependence of the magnetic susceptibility, 5 and 6 were determined to be in singlet ground states with 2Jintra /kB =-35.2 K and -13.6 K, respectively. From these results and theoretical calculations of related diradicals, the spin-polarization model counting the small spin density of the sp3 carbon atom could be used as a spin-prediction model.
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Affiliation(s)
- Haruki Tsujimoto
- Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan
| | - Shuichi Suzuki
- Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan.,Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
| | - Masatoshi Kozaki
- Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan
| | - Daisuke Shiomi
- Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan
| | - Kazunobu Sato
- Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan
| | - Takeji Takui
- Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan
| | - Keiji Okada
- Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan.,Osaka City University Advanced Research Institute for Natural Science and Technology (OCARINA), 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan
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10
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Tahara T, Suzuki S, Kozaki M, Shiomi D, Sugisaki K, Sato K, Takui T, Miyake Y, Hosokoshi Y, Nojiri H, Okada K. Triplet Diradical-Cation Salts Consisting of the Phenothiazine Radical Cation and a Nitronyl Nitroxide. Chemistry 2019; 25:7201-7209. [PMID: 30924188 DOI: 10.1002/chem.201900513] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Indexed: 11/11/2022]
Abstract
The spin-spin and magnetic properties of two (nitronyl nitroxide)-(di-p-anisylamine-phenothiazine) diradical cation salts, (DAA-PTZ)+ -NN⋅MBr4 - (M=Ga, Fe), have been investigated. These diradical-cation species were prepared by the cross-coupling of iodophenothiazine DAA-PTZ-I with NN-AuPPh3 followed by oxidation with the thianthrenium radical cation (TA+ ⋅MBr4 - ). These salts were found to be highly stable under aerobic conditions. For the GaBr4 salt, large ferromagnetic intramolecular and small antiferromagnetic intermolecular interactions (J1 /kB =+320 K and J2 /kB =-2 K, respectively) were observed. The magnetic property of the Fe3+ salt was analyzed by using a six-spin model assuming identical intramolecular exchange interaction (J3 /kB =+320 K) and the other exchange interactions (J4 /kB =-7 K and J5 /kB =-4 K). A significant color change was observed in the UV/Vis/NIR absorption spectra upon electrochemical oxidation of the doublet DAA-PTZ-NN to the triplet (DAA-PTZ)+ -NN.
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Affiliation(s)
- Takuma Tahara
- Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan
| | - Shuichi Suzuki
- Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan.,Present address: Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
| | - Masatoshi Kozaki
- Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan
| | - Daisuke Shiomi
- Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan
| | - Kenji Sugisaki
- Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan
| | - Kazunobu Sato
- Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan
| | - Takeji Takui
- Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan
| | - Yota Miyake
- Department of Physical Science, Osaka Prefecture University, Naka-ku, Sakai, Osaka, 599-8531, Japan
| | - Yuko Hosokoshi
- Department of Physical Science, Osaka Prefecture University, Naka-ku, Sakai, Osaka, 599-8531, Japan
| | - Hiroyuki Nojiri
- Institute for Materials Research, Tohoku University, Aoba-ku, Sendai Miyagi, 980-8577, Japan
| | - Keiji Okada
- Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan.,Osaka City University Advanced Research Institute, for Natural Science and Technology (OCARINA), Sumiyoshi-ku, Osaka, Osaka, 558-8585, Japan
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11
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Assembly of Imidazolyl-Substituted Nitronyl Nitroxides into Ferromagnetically Coupled Chains. CRYSTALS 2019. [DOI: 10.3390/cryst9040219] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
New nitronyl nitroxides, namely, 2-(4,5-dimethylimidazol-2-yl)- and 2-(4,5-dichloroimidazol-2-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-3-oxide-1-oxyl, were prepared in crystalline form. According to single-crystal X-ray data, intra- and intermolecular hydrogen bonds are formed between NH groups of the imidazole cycles and O atoms of the nitroxide moieties. The intermolecular H-bonds contribute to the alignment of molecules into chains along the a-axis; this alignment causes short intrachain contacts between O and C atoms carrying spin density of opposite signs. Such an arrangement of nitroxides induces ferromagnetic intrachain interactions (J ≈ 10 cm−1) between neighboring radicals.
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12
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A Crystallographic Study of a Novel Tetrazolyl-Substituted Nitronyl Nitroxide Radical. CRYSTALS 2018. [DOI: 10.3390/cryst8090334] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Spin-labelled compounds are widely used in chemistry, physics, biology, and material sciences, but the directed synthesis of some functionalized organic radicals is still a challenge. We succeeded in the preparation of a tetrazolyl-substituted nitronyl nitroxide radical in pure crystalline form. According to the single-crystal X-ray data, intra- (NH…O, 2.43 Å) and inter-molecular hydrogen bonds (NH…O, 1.91 Å) are formed between NH groups of the tetrazole cycles and O atoms of the paramagnetic moieties. The intermolecular H-bonds connect the molecules forming chains along the a-axis. Moreover, there are short intermolecular contacts between the O atoms (3.096 Å) and between the O and C atoms (3.096 Å) of the nitronyl nitroxide moieties within the chain. The spin-unrestricted broken-symmetry calculations performed at the BS-UB3LYP/def2-TZVP level of theory predicted a sufficient ferromagnetic interaction (J ≈ 20 cm–1) between the adjacent radicals inside the chain, but a weak antiferromagnetic interaction (−J ≤0.2 cm−1) between the nearest radicals belonging to the different chains. Thus, a rare case when stable radicals, the tetrazolyl-substituted nitronyl nitroxides, are ordered into ferromagnetic chains was revealed; an investigation of the magneto-structural correlations inherent in the nitroxide radical will demand a special experiment in the sub-Kelvin regime.
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Ten YA, Salnikov OG, Amitina SA, Stass DV, Rybalova TV, Kazantsev MS, Bogomyakov AS, Mostovich EA, Mazhukin DG. The Suzuki–Miyaura reaction as a tool for modification of phenoxyl-nitroxyl radicals of the 4H-imidazole N-oxide series. RSC Adv 2018; 8:26099-26107. [PMID: 35541934 PMCID: PMC9082764 DOI: 10.1039/c8ra05103h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 07/13/2018] [Indexed: 11/30/2022] Open
Abstract
2-(3,5-Di-tert-butyl-4-hydroxyphenyl)-5-(4-iodophenyl)-4,4-dimethyl-4H-imidazole 3-oxide reacts with phenylboronic acid and its substituted derivatives in a cross-coupling reaction of the Suzuki–Miyaura type to form 5-biphenyl derivatives of 4H-imidazole-N-oxide. Interaction of the same compound with B2(pin)2 in the presence of PdCl2(PPh3)2 proceeds through the formation of intermediate 1,3,2-dioxoborolane and leads to the product of homocoupling: biphenyl-bis(imidazole). Oxidation of the resultant imidazoles with lead dioxide quantitatively yields stable conjugated phenoxyl-nitroxyl mono- and diradicals, which are of interest as electroactive paramagnetic materials. The crystal structure of the monoradical, 2,6-di-tert-butyl-4-[1-oxido-4-(biphenyl-4-yl)-5,5-dimethyl-1H-imidazole-2(5H)-ylidene]cyclohex-2,5-dienone, its magnetic susceptibility, EPR spectra of the obtained hybrid radicals in solution, and cyclic voltammetry characteristics of 4H-imidazoles were studied. Pd-catalyzed cross-coupling reaction as a tool for modification of hybrid phenoxyl-nitroxides.![]()
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Affiliation(s)
- Yury A. Ten
- NN Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS
- Novosibirsk
- Russia,
| | | | - Svetlana A. Amitina
- NN Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS
- Novosibirsk
- Russia,
| | - Dmitri V. Stass
- Novosibirsk State University
- Novosibirsk
- Russia
- Voevodsky Institute of Chemical Kinetics and Combustion SB RAS
- Novosibirsk
| | - Tatyana V. Rybalova
- NN Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS
- Novosibirsk
- Russia,
- Novosibirsk State University
- Novosibirsk
| | - Maxim S. Kazantsev
- NN Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS
- Novosibirsk
- Russia,
- Novosibirsk State University
- Novosibirsk
| | | | - Evgeny A. Mostovich
- NN Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS
- Novosibirsk
- Russia,
- Novosibirsk State University
- Novosibirsk
| | - Dmitrii G. Mazhukin
- NN Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS
- Novosibirsk
- Russia,
- Novosibirsk State University
- Novosibirsk
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Takahashi Y, Miura Y, Yoshioka N. Magnetic Interaction Observed in Hetero Biradical Derivatives Containing a 2,2,5,5-Tetramethylpyrrolin-1-yloxyl Unit as a Localized Spin Center. Chemphyschem 2017; 19:175-179. [DOI: 10.1002/cphc.201701274] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Yusuke Takahashi
- Department of Applied Chemistry; Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Youhei Miura
- Department of Applied Chemistry; Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Naoki Yoshioka
- Department of Applied Chemistry; Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
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15
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Haraguchi M, Tretyakov E, Gritsan N, Romanenko G, Gorbunov D, Bogomyakov A, Maryunina K, Suzuki S, Kozaki M, Shiomi D, Sato K, Takui T, Nishihara S, Inoue K, Okada K. (Azulene-1,3-diyl)-bis(nitronyl nitroxide) and (Azulene-1,3-diyl)-bis(iminonitroxide) and Their Copper Complexes. Chem Asian J 2017; 12:2929-2941. [PMID: 28940948 DOI: 10.1002/asia.201701085] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2017] [Revised: 09/20/2017] [Indexed: 02/02/2023]
Abstract
In contrast to diradicals connected by alternant hydrocarbons, only a few studies on those connected by nonalternant hydrocarbons have been reported. The syntheses, structures, and magnetic properties of azulene-1,3-diyl linked bis(nitronyl nitroxide) (NN2 Az) and bis(iminonitroxide) (IN2 Az) diradicals and their Cu(hfac)2 (hfac=hexafluoroacetylacetonate) complexes were investigated. NN2 Az was shown to have an intramolecular ferromagnetic interaction with Jobs /kB =+10.0 K (H=-2JS1 ⋅S2 ) between (nitronyl nitroxide) spins, whereas IN2 Az was estimated to have a much weaker intramolecular magnetic interaction. The reactions of NN2 Az and IN2 Az with Cu(hfac)2 gave a 1:2 [{Cu(hfac)2 }2 (NN2 Az)] complex and a 1:1 [Cu(hfac)2 (IN2 Az)]⋅C6 H12 complex, respectively. [{Cu(hfac)2 }2 (NN2 Az)] showed strong intramolecular antiferromagnetic interactions (J1-Cu-R /kB ≈-800 K, J2-Cu-R /kB ≈-500 K) between the CuII spins and the coordinating NN spins, whereas [Cu(hfac)2 (IN2 Az)] exhibited a ferromagnetic exchange interaction (Jobs-Cu-R /kB =+114 K) between the CuII spin and the imino-coordinated iminonitroxide spin.
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Affiliation(s)
- Makoto Haraguchi
- Department of Chemistry and Molecular Materials Science, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Evgeny Tretyakov
- Vorozhtsov Institute of Organic Chemistry, Russian Academy of Sciences, Ak. Lavrentiev Avenue 9, 630090, Novosibirsk, Russian Federation.,Novosibirsk State University, Pirogova Street, 2, 630090, Novosibirsk, Russian Federation
| | - Nina Gritsan
- Novosibirsk State University, Pirogova Street, 2, 630090, Novosibirsk, Russian Federation.,Voevodsky Institute of Chemical Kinetics and Combustion, 3 ul. Institutskaya, 630090, Novosibirsk, Russian Federation
| | - Galina Romanenko
- International Tomography Center, Russian Academy of Sciences, 3a ul. Institutskaya, 630090, Novosibirsk, Russian Federation
| | - Dmitry Gorbunov
- Novosibirsk State University, Pirogova Street, 2, 630090, Novosibirsk, Russian Federation.,Voevodsky Institute of Chemical Kinetics and Combustion, 3 ul. Institutskaya, 630090, Novosibirsk, Russian Federation
| | - Artem Bogomyakov
- International Tomography Center, Russian Academy of Sciences, 3a ul. Institutskaya, 630090, Novosibirsk, Russian Federation
| | - Kseniya Maryunina
- Department of Chemistry, Graduate School of Science, Center for Chiral Science and Institute for Advanced Materials Research, Hiroshima University, 1-3-1, Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Shuichi Suzuki
- Department of Chemistry and Molecular Materials Science, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan.,Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
| | - Masatoshi Kozaki
- Department of Chemistry and Molecular Materials Science, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Daisuke Shiomi
- Department of Chemistry and Molecular Materials Science, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Kazunobu Sato
- Department of Chemistry and Molecular Materials Science, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Takeji Takui
- Department of Chemistry and Molecular Materials Science, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Sadafumi Nishihara
- Department of Chemistry, Graduate School of Science, Center for Chiral Science and Institute for Advanced Materials Research, Hiroshima University, 1-3-1, Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Katsuya Inoue
- Department of Chemistry, Graduate School of Science, Center for Chiral Science and Institute for Advanced Materials Research, Hiroshima University, 1-3-1, Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Keiji Okada
- Department of Chemistry and Molecular Materials Science, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan.,The Osaka City University Advanced Research Institute for Natural Science and Technology (OCARINA), Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
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16
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Tretyakov E, Keerthi A, Baumgarten M, Veber S, Fedin M, Gorbunov D, Shundrina I, Gritsan N. The Design of Radical Stacks: Nitronyl-Nitroxide-Substituted Heteropentacenes. ChemistryOpen 2017; 6:642-652. [PMID: 29046859 PMCID: PMC5641907 DOI: 10.1002/open.201700110] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 07/20/2017] [Indexed: 11/07/2022] Open
Abstract
The first alkyl chain-anchored heteropentacene, dithieno[2,3-d;2',3'-d']benzo-[1,2-b;3,4-b']dithiophene (DTmBDT), mono- or disubstituted with a nitronyl nitroxide group has been prepared through a cross-coupling synthetic procedure of the corresponding dibromo-derivative (Br2-DTmBDT) with a nitronyl nitroxide-2-ide gold(I) complex. The synthesized nitroxides possess high kinetic stability, which allowed us to investigate their structure and thermal, optical, electrochemical, and magnetic properties. Single-crystal X-ray diffraction of both mono- and diradicals revealed that the nitronyl nitroxide group lies almost in the same plane as the nearest side thiophene ring. Such arrangement favors formation of edge-to-edge dimers, which then form close π-stacks surrounded by interdigitating alkyl chains. Before melting, these nitronyl nitroxide radical substituted molecules undergo at least two different phase transitions (PTs): for the monoradical, PTs are reversible, accompanied by hysteresis, and occur near 13 and 83 °C; the diradical upon heating shows a reversible PT with hysteresis in the temperature range 2-11 °C and an irreversible PT near 135 °C. PTs of this type are absent in Br2-DTmBDT. Therefore, the step-by-step substitution of bromine atoms by nitronyl nitroxide groups changes the structural organization of DTmBDT and induces the emergence of PTs. This knowledge may facilitate crystal engineering of π-stacked paramagnets and related molecular spin devices.
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Affiliation(s)
- Evgeny Tretyakov
- N. N. Vorozhtsov Institute of Organic Chemistry9 Ac. Lavrentiev AvenueNovosibirsk630090Russia
- Novosibirsk State University2 Pirogova Str.Novosibirsk630090Russia
| | - Ashok Keerthi
- Max Planck Institute for Polymer ResearchAckermannweg 10Mainz55128Germany
| | - Martin Baumgarten
- Max Planck Institute for Polymer ResearchAckermannweg 10Mainz55128Germany
| | - Sergey Veber
- Novosibirsk State University2 Pirogova Str.Novosibirsk630090Russia
- International Tomography Center3a Institutskaya Str.Novosibirsk630090Russia
| | - Matvey Fedin
- Novosibirsk State University2 Pirogova Str.Novosibirsk630090Russia
- International Tomography Center3a Institutskaya Str.Novosibirsk630090Russia
| | - Dmitry Gorbunov
- Novosibirsk State University2 Pirogova Str.Novosibirsk630090Russia
- V. V. Voevodsky Institute of Chemical Kinetics and Combustion3 Institutskaya Str.Novosibirsk630090Russia
| | - Inna Shundrina
- N. N. Vorozhtsov Institute of Organic Chemistry9 Ac. Lavrentiev AvenueNovosibirsk630090Russia
| | - Nina Gritsan
- Novosibirsk State University2 Pirogova Str.Novosibirsk630090Russia
- V. V. Voevodsky Institute of Chemical Kinetics and Combustion3 Institutskaya Str.Novosibirsk630090Russia
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