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Chernavin PA, Letyagin GA, Tolstikov SE, Kolesnikov AE, Romanenko GV, Smirnova KA, Borodulina AV, Ovcharenko VI, Bogomyakov AS. Pyridyl-Substituted Nitronyl Nitroxides: Comprehensive Magnetochemical and Quantum Chemical Study. Chemistry 2024; 30:e202400873. [PMID: 38869212 DOI: 10.1002/chem.202400873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 05/17/2024] [Accepted: 06/12/2024] [Indexed: 06/14/2024]
Abstract
A series of pyridyl-substituted nitronyl nitroxides was synthesized and structurally characterized. A comprehensive magnetochemical and quantum chemical study of extended raw of the nitroxides with different substituents R in the pyridine fragment was performed. It was shown, that temperature-dependent magnetic properties are determined by the short contacts between nitroxide groups of adjacent molecules as well as between nitroxide group and methyl substituents in the pseudo axial positions of imidazoline fragments. Quantum chemistry allows to select the appropriate model of exchange cluster for analysis of experimental magnetic data and evaluation of the exchange interaction parameters. For NN-PyCl the "order-disorder" transition was detected by means of low temperature XRD. The difference in the experimental and calculated exchange interaction energies may serve as an indicator of temperature-induced structural rearrangements. For instance, for methyl substituted nitronyl nitroxide NN-PyMe structural transformations and significant changes in exchange interaction energies were observed.
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Affiliation(s)
- Platon A Chernavin
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya St. 3a, 630090, Novosibirsk, Russian Federation
- Novosibirsk State University, Pirogova St. 2, 630090, Novosibirsk, Russian Federation
| | - Gleb A Letyagin
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya St. 3a, 630090, Novosibirsk, Russian Federation
- Novosibirsk State University, Pirogova St. 2, 630090, Novosibirsk, Russian Federation
| | - Svyatoslav E Tolstikov
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya St. 3a, 630090, Novosibirsk, Russian Federation
| | - Andrey E Kolesnikov
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya St. 3a, 630090, Novosibirsk, Russian Federation
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Ave. 47, 119991, Moscow, Russian Federation
| | - Galina V Romanenko
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya St. 3a, 630090, Novosibirsk, Russian Federation
| | - Kristina A Smirnova
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya St. 3a, 630090, Novosibirsk, Russian Federation
- Novosibirsk State University, Pirogova St. 2, 630090, Novosibirsk, Russian Federation
| | - Alexandra V Borodulina
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya St. 3a, 630090, Novosibirsk, Russian Federation
- Novosibirsk State University, Pirogova St. 2, 630090, Novosibirsk, Russian Federation
| | - Victor I Ovcharenko
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya St. 3a, 630090, Novosibirsk, Russian Federation
| | - Artem S Bogomyakov
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya St. 3a, 630090, Novosibirsk, Russian Federation
- Novosibirsk State University, Pirogova St. 2, 630090, Novosibirsk, Russian Federation
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Samsonenko AA, Artiukhova NA, Letyagin GA, Kiryutin AS, Zhukov IV, Veber SL. Microgravity-like Crystallization of Paramagnetic Species in Strong Magnetic Fields. Int J Mol Sci 2024; 25:5110. [PMID: 38791149 PMCID: PMC11120673 DOI: 10.3390/ijms25105110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2024] [Revised: 05/02/2024] [Accepted: 05/06/2024] [Indexed: 05/26/2024] Open
Abstract
The crystallization of paramagnetic species in a magnetic field gradient under microgravity-like conditions is an area of interest for both fundamental and applied science. In this paper, a setup for the crystallization of paramagnetic species in the magnetic field up to 7 T generated by a superconducting magnet is described. The research includes calculations of the conditions necessary to compensate for the gravitational force for several types of paramagnetic substances using the magnetic field of superconducting magnets (4.7 T, 7 T, 9.4 T, and 16.4 T). Additionally, for the first time, the crystallization of copper sulfate and cobalt sulfate, as well as a mixture of copper sulfate and cobalt sulfate under gravitational force compensation in a superconducting magnet, was performed. This paper experimentally demonstrates the feasibility of growing paramagnetic crystals within the volume of a test tube on the example of copper and cobalt sulfate crystals. A comparison of crystals grown from the solution of a mixture of copper and cobalt sulfates under the same conditions, with and without the presence of a magnetic field, showed changes in both the number and size of crystals.
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Affiliation(s)
| | | | | | | | | | - Sergey L. Veber
- International Tomography Center of the Siberian Branch of the Russian Academy of Sciences, 3a, Institutskaya Str., Novosibirsk 630090, Russia; (A.A.S.); (N.A.A.); (G.A.L.); (A.S.K.); (I.V.Z.)
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Kostin GA, Kozlov R, Bogomyakov A, Tolstikov S, Sheven D, Korenev S. New Ruthenium Nitrosyl Complexes Combining Potentially Photoactive Nitrosyl Group with the Magnetic Nitroxide Radicals as Ligands. Int J Mol Sci 2023; 24:13371. [PMID: 37686176 PMCID: PMC10488014 DOI: 10.3390/ijms241713371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 08/24/2023] [Accepted: 08/25/2023] [Indexed: 09/10/2023] Open
Abstract
Two ruthenium nitrosyl complexes of Na[RuNOCl4L] with nitronyl nitroxide radicals coordinated to ruthenium with N-donor pyridine rings were prepared and described. The crystal structure of both complexes is 1D or 2D polymeric, due to the additional coordination of sodium cation by bridging the chloride ligands or oxygen atoms of nitroxides. Partially, the oligomeric forms remain in the solutions of the complexes in acetonitrile. The magnetic measurements in the solid state demonstrate the presence of antiferromagnetic interactions through the exchange channels, with the distance between paramagnetic centers equal to 3.1-3.9 Å. The electrochemical behavior of the prepared complexes was investigated in acetonitrile solutions.
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Affiliation(s)
- Gennadiy A. Kostin
- Nikolaev Institute of Inorganic Chemistry Siberian Branch of Russian Academy of Science, Lavrentieva, 3, 630090 Novosibirsk, Russia
| | - Ruslan Kozlov
- Department of Natural Sciences, Novosibirsk State University, Pirogova, 2, 630090 Novosibirsk, Russia
| | - Artem Bogomyakov
- International Tomography Center Siberian Branch of Russian Academy of Science, Institutskaya, 3a, 630090 Novosibirsk, Russia
| | - Svyatoslav Tolstikov
- International Tomography Center Siberian Branch of Russian Academy of Science, Institutskaya, 3a, 630090 Novosibirsk, Russia
| | - Dmitriy Sheven
- Nikolaev Institute of Inorganic Chemistry Siberian Branch of Russian Academy of Science, Lavrentieva, 3, 630090 Novosibirsk, Russia
| | - Sergey Korenev
- Nikolaev Institute of Inorganic Chemistry Siberian Branch of Russian Academy of Science, Lavrentieva, 3, 630090 Novosibirsk, Russia
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Kostin GA, Tolstikov SE, Kuratieva NV, Nadolinny VA, Ovcharenko VI. FIRST EXAMPLE OF RUTHENIUM NITROSO COMPLEXES WITH A NITROXYL RADICAL AS A LIGAND. J STRUCT CHEM+ 2023. [DOI: 10.1134/s0022476623020014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
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Kuznetsova O, Saifulina D, Romanenko G, Letyagin G, Bogomyakov A. Self-assembly of the 4-nuclear fragment {Cu4(hfac)2(LHF) (LF)2-} with deprotonated trihydroxyoxanes and heterospin complexes with nitroxides. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Tolstikov S, Smirnova K, Kolesnikov A, Letyagin G, Bogomyakov A, Romanenko G, Ovcharenko V. Relationship between phase transition temperature and accessible volume for substituent in Cu(hfac)2 chain-polymer complexes with pyridine-based nitroxides. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Romanenko GV, Fokin SV, Bogomyakov AS, Zueva EM, Ovcharenko VI. A FLATTENED OCTAHEDRON – THE METAL ENVIRONMENT IN COMPLEXES WITH PYRROLYL-SUBSTITUTED NITROXIDE DIRADICALS. J STRUCT CHEM+ 2022. [DOI: 10.1134/s0022476622030106] [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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Romanenko GV, Fokin SV, Chubakova ET, Bogomyakov AS, Ovcharenko VI. MAGNETIC ANOMALIES IN POLYMERIC CHAIN COMPLEXES Cu(hfac)2 WITH SPIN-LABELED DIALKYLPYRAZOLES. J STRUCT CHEM+ 2022. [DOI: 10.1134/s0022476622010103] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Heterospin iron complexes with dioxolenes functionalized with stable radicals: quantum chemical study. Russ Chem Bull 2022. [DOI: 10.1007/s11172-021-3347-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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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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11
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Romanenko GV, Letyagin GA, Ovcharenko VI. Effect of pressure on the structure of multispin complexes. RUSSIAN CHEMICAL REVIEWS 2022. [DOI: 10.1070/rcr5028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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12
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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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Lu J, Jing P, Jin C, Xie J, Li L. Modulating the magnetization dynamics in Ln-Cu-Rad hetero-tri-spin complexes through cis/ trans coordination of nitronyl nitroxide radicals around the metal center. Dalton Trans 2021; 50:3280-3288. [PMID: 33587736 DOI: 10.1039/d1dt00090j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Self-assembling the novel nitronyl nitroxide radical NIT-3Py-5-Ph (2-(5-phenyl-3-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) with Ln(hfac)3·2H2O and Cu(hfac)2 (hfac = hexafluoroacetylacetonate) resulted in two heterometallic complexes with formula [LnCu(hfac)5(NIT-3Py-5-Ph)2] (Ln = Gd 1, Dy 2), in which two NIT-3Py-5-Ph radicals are coordinated with the LnIII ion via their nitroxide units in the cis-arrangement manner and the CuII ion is ligated by the pyridyl N donors of the radicals. Interestingly, when the phenyl group of NIT-3Py-5-Ph was replaced with a p-pyridyl group, a new family of 2D networks, namely, {[Ln(hfac)3][Cu(hfac)2]2(NIT-3Py-5-4Py)2}n (Ln = Gd 3, Tb 4, Dy 5; NIT-3Py-5-4Py = 2-(5-(4-pyridyl)-3-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) was obtained. In the 2D sheet, each NIT-3Py-5-4Py ligand serves as a μ3-bridge to bind one LnIII center by the aminoxyl moiety and two CuII ions through two pyridine groups to form a 2D structure. The LnIII ion is coordinated by two NO units of two radicals in a trans configuration. DC magnetic measurements indicate that ferromagnetic LnIII-NO exchange occurs in 1-5. AC studies reveal that 2 displays slow relaxation of the magnetization while no such magnetic relaxation is found in complex 5. The observed different magnetic relaxation behaviors of two Dy analogues could be attributed to the different coordination modes of NO groups of the radicals, and the coordination geometry of the Dy center is from C2v in 2 to D2d in 5.
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Affiliation(s)
- Jiao Lu
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
| | - Pei Jing
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
| | - Chaoyi Jin
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
| | - Junfang Xie
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
| | - Licun Li
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
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Zaytseva EV, Mazhukin DG. Spirocyclic Nitroxides as Versatile Tools in Modern Natural Sciences: From Synthesis to Applications. Part I. Old and New Synthetic Approaches to Spirocyclic Nitroxyl Radicals. Molecules 2021; 26:677. [PMID: 33525514 PMCID: PMC7865516 DOI: 10.3390/molecules26030677] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 01/19/2021] [Accepted: 01/25/2021] [Indexed: 12/19/2022] Open
Abstract
Spirocyclic nitroxyl radicals (SNRs) are stable paramagnetics bearing spiro-junction at a-, b-, or g-carbon atom of the nitroxide fragment, which is part of the heterocyclic system. Despite the fact that the first representatives of SNRs were obtained about 50 years ago, the methodology of their synthesis and their usage in chemistry and biochemical applications have begun to develop rapidly only in the last two decades. Due to the presence of spiro-function in the SNRs molecules, the latter have increased stability to various reducing agents (including biogenic ones), while the structures of the biradicals (SNBRs) comprises a rigid spiro-fused core that fixes mutual position and orientation of nitroxide moieties that favors their use in dynamic nuclear polarization (DNP) experiments. This first review on SNRs will give a glance at various strategies for the synthesis of spiro-substituted, mono-, and bis-nitroxides on the base of six-membered (piperidine, 1,2,3,4-tetrahydroquinoline, 9,9'(10H,10H')-spirobiacridine, piperazine, and morpholine) or five-membered (2,5-dihydro-1H-pyrrole, pyrrolidine, 2,5-dihydro-1H-imidazole, 4,5-dihydro-1H-imidazole, imidazolidine, and oxazolidine) heterocyclic cores.
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Affiliation(s)
| | - Dmitrii G. Mazhukin
- Novosibirsk Institute of Organic Chemistry, Siberian Branch of Russian Academy of Sciences (SB RAS), Academician Lavrentiev Ave. 9, 630090 Novosibirsk, Russia;
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15
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Tumanov SV, Veber SL, Tolstikov SE, Artiukhova NA, Ovcharenko VI, Fedin MV. Exchange interactions in photoinduced magnetostructural states of copper( ii)–nitroxide spin dyads. Dalton Trans 2020; 49:5851-5858. [DOI: 10.1039/d0dt00706d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
We investigate intra- and intercluster exchange couplings in photoinduced states of copper(ii)–nitroxide based molecular magnets (“breathing crystals”) using variable-temperature EPR spectroscopy.
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Affiliation(s)
- Sergey V. Tumanov
- International Tomography Center SB RAS
- 630090 Novosibirsk
- Russia
- Novosibirsk State University
- 630090 Novosibirsk
| | - Sergey L. Veber
- International Tomography Center SB RAS
- 630090 Novosibirsk
- Russia
- Novosibirsk State University
- 630090 Novosibirsk
| | | | | | | | - Matvey V. Fedin
- International Tomography Center SB RAS
- 630090 Novosibirsk
- Russia
- Novosibirsk State University
- 630090 Novosibirsk
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16
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Sherstobitova T, Maryunina K, Tolstikov S, Letyagin G, Romanenko G, Nishihara S, Inoue K. Ligand Structure Effects on Molecular Assembly and Magnetic Properties of Copper(II) Complexes with 3-Pyridyl-Substituted Nitronyl Nitroxide Derivatives. ACS OMEGA 2019; 4:17160-17170. [PMID: 31656889 PMCID: PMC6811855 DOI: 10.1021/acsomega.9b01575] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 08/15/2019] [Indexed: 06/10/2023]
Abstract
Reaction of Cu(hfac)2 with methyl- and bromo-3-pyridyl-substituted nitronyl nitroxides (L R ) leads to assemble a diverse set of coordination complexes: mononuclear [Cu(hfac)2L 2-Me ], binuclear [{Cu(hfac)2}2(H2O)L 2-Me ], trinuclear [{Cu(hfac)2}3(L 6-Br )2], pentanuclear [{Cu(hfac)2}5(L 2-Me )2], and [{Cu(hfac)2}5(L 2-Me )4], cocrystals [Cu(hfac)2(L 2-Br )2]·[Cu(hfac)2(H2O)2] and [Cu(hfac)2(L 2-Br )2]·2[Cu(hfac)2H2O], one-dimensional polymers [Cu(hfac)2L 2-Br ] n and [Cu(hfac)2L 6-Br ] n , and cyclic dimers [Cu(hfac)2L 5-Me ]2, [Cu(hfac)2L 5-Br ]2, and [Cu(hfac)2L 6-Me ]2. The molecular structures of the obtained complexes are strongly affected by the substituent type and its location in the pyridine heterocycle. Occupation of the second position of the pyridine ring increases the steric hindrance of both imine and nitroxide coordination sites of L 2-R , which is favorable for the formation of various conformers and precipitation of complexes with different molecular structures. The pentanuclear [{Cu(hfac)2}5(L 2-Me )2] and [{Cu(hfac)2}5(L 2-Me )4] complexes do not have prior analogues and are valuable model objects for investigation of the mechanism of formation of various coordination polymers. The arrangement of long Cu-ONO bonds in {CuO6} square bipyramids due to the weakening nitroxide donor site in complexes, based on L 2-Me , L 2-Br , and L 6-Br ligands, results in ferromagnetic exchange interactions between spins of Cu2+ ions and nitroxides. Complexes with substituents that do not considerably affect the coordination ability of ligands (L 5-Me , L 5-Br , and L 6-Me ) exhibit strong antiferromagnetic exchange interactions between spins of Cu2+ ions and nitroxides.
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Affiliation(s)
- Tatiana Sherstobitova
- Department of Chemistry, Graduate
School of Science, Chirality Research Center (CResCent), and Institute for
Advanced Materials Research, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - Kseniya Maryunina
- Department of Chemistry, Graduate
School of Science, Chirality Research Center (CResCent), and Institute for
Advanced Materials Research, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
- International
Tomography Center SB RAS, Institutskaya Str. 3a, Novosibirsk 630090, Russian Federation
| | - Svyatoslav Tolstikov
- International
Tomography Center SB RAS, Institutskaya Str. 3a, Novosibirsk 630090, Russian Federation
| | - Gleb Letyagin
- International
Tomography Center SB RAS, Institutskaya Str. 3a, Novosibirsk 630090, Russian Federation
- Novosibirsk
State University, Pirogova
Str. 1, Novosibirsk 630090, Russian Federation
| | - Galina Romanenko
- International
Tomography Center SB RAS, Institutskaya Str. 3a, Novosibirsk 630090, Russian Federation
| | - Sadafumi Nishihara
- Department of Chemistry, Graduate
School of Science, Chirality Research Center (CResCent), 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, Chirality Research Center (CResCent), and Institute for
Advanced Materials Research, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
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Spin Transition in the Cu(hfac)2 Complex with (4-Ethylpyridin-3-yl)-Substituted Nitronyl Nitroxide Caused by the “Asymmetric” Structural Rearrangement of Exchange Clusters in the Heterospin Molecule. CRYSTALS 2019. [DOI: 10.3390/cryst9060285] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Methods for the synthesis of binuclear [Cu(hfac)2LEt]2 and tetranuclear [[Cu(hfac)2]4(LEt)2] heterospin compounds based on copper hexafluoroacetylacetonate [Cu(hfac)2] and 2-(4-ethylpyridin-3-yl)-4,5-bis(spirocyclopentyl)-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl (LEt), were developed. The crystals of the complexes are elastic and do not crash during repeated cooling–heating cycles. It was found that a singlet–triplet conversion occurred in all of the {Cu(II)–O•–N<} exchange clusters in the molecules of the binuclear [Cu(hfac)2LEt]2 which led to spin coupling with cooling. The transition occurred in a wide temperature range with a maximum gradient ΔχT at ≈180 K. The structural transformation of the crystals takes place at T < 200 K and is accompanied by the lowering of symmetry from monoclinic to triclinic, twinning, and a considerable shortening of the Cu–ONO distance (2.19 and 1.97 Å at 295 and 50 K, respectively). For the tetranuclear [[Cu(hfac)2]4(LEt)2], two structural transitions were recorded (at ≈154 K and ≈118 K), which led to a considerable change in the spatial position of the Et substituent in the nitronyl nitroxyl fragment. The low-temperature process was accompanied by a spin transition recorded as a hysteresis loop on the χT(T) curve during the repeated cooling–heating cycles (T½↑ = 122 K, T½↓ = 115 K). This transition is unusual because it causes spin coupling in half of all of the {>N–•O–Cu2+} terminal exchange clusters, leading to spin compensation for only two paramagnetic centers of the six centers in the molecule.
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Artiukhova NA, Romanenko GV, Letyagin GA, Bogomyakov AS, Tolstikov SE, Ovcharenko VI. Spin transition characteristics of molecular solvates of CuII complexes with nitroxides: sensitivity to the packing type. Russ Chem Bull 2019. [DOI: 10.1007/s11172-019-2480-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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19
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Meng X, Shi W, Cheng P. Magnetism in one-dimensional metal–nitronyl nitroxide radical system. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2018.02.002] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Dong X, Lorenc M, Tretyakov EV, Ovcharenko VI, Fedin MV. Light-Induced Spin State Switching in Copper(II)-Nitroxide-Based Molecular Magnet at Room Temperature. J Phys Chem Lett 2017; 8:5587-5592. [PMID: 29087205 DOI: 10.1021/acs.jpclett.7b02497] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Molecular magnets Cu(hfac)2LR exhibit an unusual type of photoinduced magnetostructural switching in exchange-coupled copper(II)-nitroxide clusters. Such photoswitching from strongly coupled to weakly coupled spin state (SS → WS) was recently found to be ultrafast, thus enhancing the interest in these systems and the scope of their potential applications. However, to date such SS → WS photoswitching was demonstrated only at cryogenic temperatures, being limited by the absence of suitable SS states and short relaxation times at T > 100 K. In this work we selected model compound Cu(hfac)2Liso-Pr residing in the mixed SS/WS state at room temperature and investigated it using femtosecond optical spectroscopy. Photoinduced spin dynamics was detected, and an ultrafast SS → WS photoswitching was for the first time demonstrated at room temperature, constituting an important milestone in the development of copper(II)-nitroxide molecular magnets for practical purposes.
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Affiliation(s)
- Xu Dong
- Institut de Physique de Rennes , UMR CNRS 6251, Universite de Rennes 1, 35042 Rennes, France
| | - Maciej Lorenc
- Institut de Physique de Rennes , UMR CNRS 6251, Universite de Rennes 1, 35042 Rennes, France
| | - Evgeny V Tretyakov
- International Tomography Center SB RAS , 630090, Novosibirsk, Russia
- Novosibirsk State University , 630090, Novosibirsk, Russia
| | | | - Matvey V Fedin
- International Tomography Center SB RAS , 630090, Novosibirsk, Russia
- Novosibirsk State University , 630090, Novosibirsk, Russia
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Tumanov SV, Veber SL, Tolstikov SE, Artiukhova NA, Romanenko GV, Ovcharenko VI, Fedin MV. Light-Induced Spin State Switching and Relaxation in Spin Pairs of Copper(II)–Nitroxide Based Molecular Magnets. Inorg Chem 2017; 56:11729-11737. [DOI: 10.1021/acs.inorgchem.7b01689] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sergey V. Tumanov
- International Tomography Center SB RAS, Institutskaya
Str. 3a, 630090 Novosibirsk, Russia
- Novosibirsk State University, Pirogova
Str. 2, 630090 Novosibirsk, Russia
| | - Sergey L. Veber
- International Tomography Center SB RAS, Institutskaya
Str. 3a, 630090 Novosibirsk, Russia
- Novosibirsk State University, Pirogova
Str. 2, 630090 Novosibirsk, Russia
| | | | - Natalia A. Artiukhova
- International Tomography Center SB RAS, Institutskaya
Str. 3a, 630090 Novosibirsk, Russia
| | - Galina V. Romanenko
- International Tomography Center SB RAS, Institutskaya
Str. 3a, 630090 Novosibirsk, Russia
| | - Victor I. Ovcharenko
- International Tomography Center SB RAS, Institutskaya
Str. 3a, 630090 Novosibirsk, Russia
| | - Matvey V. Fedin
- International Tomography Center SB RAS, Institutskaya
Str. 3a, 630090 Novosibirsk, Russia
- Novosibirsk State University, Pirogova
Str. 2, 630090 Novosibirsk, Russia
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Selivanova G, Tretyakov E, Amosov E, Bagryanskaya I, Vasiliev V, Vasilyev E, Tikhova V, Karpova E, Basova T, Stass D, Shteingarts V. X-ray induced phase transitions in 4-((4-(dibutylamino)phenyl)diazenyl)-biphenyl-2,3′,4′-tricarbonitrile. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2015.11.060] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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