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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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Zayakin I, Tretyakov E, Akyeva A, Syroeshkin M, Burykina J, Dmitrenok A, Korlyukov A, Nasyrova D, Bagryanskaya I, Stass D, Ananikov V. Overclocking Nitronyl Nitroxide Gold Derivatives in Cross-Coupling Reactions. Chemistry 2023; 29:e202203118. [PMID: 36259387 DOI: 10.1002/chem.202203118] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Indexed: 12/12/2022]
Abstract
Nitronyl nitroxides are functional building blocks in cutting-edge research fields, such as the design of molecular magnets, the development of redox and photoswitchable molecular systems and the creation of redox-active components for organic and hybrid batteries. The key importance of the nitronyl nitroxide function is to translate molecular-level-optimized structures into nano-scale devices and new technologies. In spite of great importance, efficient and versatile synthetic approaches to these compounds still represent a challenge. Particularly, methods for the direct introduction of a nitronyl nitroxide moiety into aromatic systems possess many limitations. Here, we report gold derivatives of nitronyl nitroxide that can enter Pd(0)-catalysed cross-coupling reactions with various aryl bromides, affording the corresponding functionalized nitronyl nitroxides. Based on the high thermal stability and enhanced reactivity in catalytic transformation, a new reagent is suggested for the synthesis of radical systems via a universal cross-coupling approach.
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Affiliation(s)
- Igor Zayakin
- N. D. Zelinsky Institute of Organic Chemistry, 47 Leninsky Prosp., 119991, Moscow, Russia
| | - Evgeny Tretyakov
- N. D. Zelinsky Institute of Organic Chemistry, 47 Leninsky Prosp., 119991, Moscow, Russia
| | - Anna Akyeva
- N. D. Zelinsky Institute of Organic Chemistry, 47 Leninsky Prosp., 119991, Moscow, Russia
| | - Mikhail Syroeshkin
- N. D. Zelinsky Institute of Organic Chemistry, 47 Leninsky Prosp., 119991, Moscow, Russia
| | - Julia Burykina
- N. D. Zelinsky Institute of Organic Chemistry, 47 Leninsky Prosp., 119991, Moscow, Russia
| | - Andrey Dmitrenok
- N. D. Zelinsky Institute of Organic Chemistry, 47 Leninsky Prosp., 119991, Moscow, Russia
| | - Alexander Korlyukov
- A. N. Nesmeyanov Institute of Organoelement Compounds, 28 Vavilov Str., 119991, Moscow, Russia
| | - Darina Nasyrova
- N. D. Zelinsky Institute of Organic Chemistry, 47 Leninsky Prosp., 119991, Moscow, Russia
| | - Irina Bagryanskaya
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Akad. Lavrentyev Prosp., 630090, Novosibirsk, Russia
| | - Dmitri Stass
- V. V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya Str., 630090, Novosibirsk, Russia
| | - Valentine Ananikov
- N. D. Zelinsky Institute of Organic Chemistry, 47 Leninsky Prosp., 119991, Moscow, Russia
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Fedyushin PA, Serykh AA, Vinogradov AS, Mezhenkova TV, Platonov VE, Nasyrova DI, Samigullina AI, Fedin MV, Zayakin IA, Tretyakov EV. Biradical with a polyfluorinated terphenylene backbone. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3577-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Starikov AG, Chegerev MG, Starikova AA, Minkin VI. Organic Polyradicals Based on Acenes. Computational Modeling. DOKLADY CHEMISTRY 2022. [DOI: 10.1134/s0012500822030028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Kovalev AI, Khotina IA. Microporous polymers based on triacetylarenes. MENDELEEV COMMUNICATIONS 2022. [DOI: 10.1016/j.mencom.2022.03.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Investigation of a C(sp2)-coupled nitronyl nitroxide diradical by electron paramagnetic resonance. Russ Chem Bull 2022. [DOI: 10.1007/s11172-021-3355-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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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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Biagiotti G, Perini I, Richichi B, Cicchi S. Novel Synthetic Approach to Heteroatom Doped Polycyclic Aromatic Hydrocarbons: Optimizing the Bottom-Up Approach to Atomically Precise Doped Nanographenes. Molecules 2021; 26:6306. [PMID: 34684887 PMCID: PMC8537472 DOI: 10.3390/molecules26206306] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 10/11/2021] [Accepted: 10/13/2021] [Indexed: 11/16/2022] Open
Abstract
The success of the rational bottom-up approach to nanostructured carbon materials and the discovery of the importance of their doping with heteroatoms puts under the spotlight all synthetic organic approaches to polycyclic aromatic hydrocarbons. The construction of atomically precise heteroatom doped nanographenes has evidenced the importance of controlling its geometry and the position of the doping heteroatoms, since these parameters influence their chemical-physical properties and their applications. The growing interest towards this research topic is testified by the large number of works published in this area, which have transformed a once "fundamental research" into applied research at the cutting edge of technology. This review analyzes the most recent synthetic approaches to this class of compounds.
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Affiliation(s)
- Giacomo Biagiotti
- Department of Chemistry “Ugo Schiff”, Università di Firenze, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy; (G.B.); (I.P.)
| | - Ilaria Perini
- Department of Chemistry “Ugo Schiff”, Università di Firenze, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy; (G.B.); (I.P.)
| | - Barbara Richichi
- Department of Chemistry “Ugo Schiff”, Università di Firenze, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy; (G.B.); (I.P.)
- National Interuniversity Consortium for Materials Science and Technology (INSTM), Via G. Giusti, 9, 50121 Firenze, Italy
| | - Stefano Cicchi
- Department of Chemistry “Ugo Schiff”, Università di Firenze, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy; (G.B.); (I.P.)
- National Interuniversity Consortium for Materials Science and Technology (INSTM), Via G. Giusti, 9, 50121 Firenze, Italy
- Institute of Chemistry of Organometallic Compounds, ICCOM-CNR, Via Madonna del Piano, 10, 50019 Sesto Fiorentino, Italy
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Electronic structure and magnetic properties of pyridinophane complexes of iron with radical-bearing catecholates: a quantum chemical study. Russ Chem Bull 2021. [DOI: 10.1007/s11172-021-3154-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Politanskaya LV, Fedyushin PA, Rybalova TV, Bogomyakov AS, Asanbaeva NB, Tretyakov EV. Fluorinated Organic Paramagnetic Building Blocks for Cross-Coupling Reactions. Molecules 2020; 25:molecules25225427. [PMID: 33228185 PMCID: PMC7699513 DOI: 10.3390/molecules25225427] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 11/15/2020] [Accepted: 11/18/2020] [Indexed: 12/03/2022] Open
Abstract
New stable polyfluorinated nitroxide radicals for use in cross-coupling reactions, namely, N-tert-butyl-N-oxyamino-2,3,5,6-tetrafluoro-4-iodobenzene and N-tert-butyl-N-oxyamino-2,3,5,6-tetrafluoro-4-ethynylbenzene, were prepared from perfluoroiodobenzene. The reaction of the polyfluoro derivative with tert-butylamine under autoclaving conditions leading to the formation of N-tert-butyl-2,3,5,6-tetrafluoro-4-iodoaniline proved to be the key stage of the whole process. The fluorinated tert-butyl iodophenyl nitroxide was found to form in a solid state via N–O···I halogen bonds, a one-dimensional assembly of the radicals. The acceptor role of the nitroxide group in the halogen bonding changes to a donor role when the nitroxide reacts with Cu(hfac)2. In the last case, zero-dimensional assembly prevails, giving a three-spin complex with axial coordinated nitroxide groups and, as a consequence, causing ferromagnetic intramolecular exchange interactions between Cu(II) and radical spins.
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Affiliation(s)
- Larisa V. Politanskaya
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Ac. Lavrentiev Avenue, 630090 Novosibirsk, Russia; (L.V.P.); (P.A.F.); (T.V.R.); (N.B.A.)
| | - Pavel A. Fedyushin
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Ac. Lavrentiev Avenue, 630090 Novosibirsk, Russia; (L.V.P.); (P.A.F.); (T.V.R.); (N.B.A.)
| | - Tatyana V. Rybalova
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Ac. Lavrentiev Avenue, 630090 Novosibirsk, Russia; (L.V.P.); (P.A.F.); (T.V.R.); (N.B.A.)
| | - Artem S. Bogomyakov
- International Tomography Center, Siberian Branch of Russian Academy of Sciences, 3a Institutskaya Str., 630090 Novosibirsk, Russia;
| | - Nargiz B. Asanbaeva
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Ac. Lavrentiev Avenue, 630090 Novosibirsk, Russia; (L.V.P.); (P.A.F.); (T.V.R.); (N.B.A.)
| | - Evgeny V. Tretyakov
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Ac. Lavrentiev Avenue, 630090 Novosibirsk, Russia; (L.V.P.); (P.A.F.); (T.V.R.); (N.B.A.)
- N.D. Zelinsky Institute of Organic Chemistry, Leninsky Prospect, 47, 119991 Moscow, Russia
- Correspondence:
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Ershova IV, Piskunov AV, Cherkasov VK. Complexes of diamagnetic cations with radical anion ligands. RUSSIAN CHEMICAL REVIEWS 2020. [DOI: 10.1070/rcr4957] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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