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Golomolzina IV, Tolstikov SE, Smirnova KA, Fokin SV, Letyagin GA, Romanenko GV, Bogomyakov AS. N-Alkylimidazol-5-yl-substituted Nitronyl Nitroxides and Their Mononuclear Cu(II) Complexes: Synthesis, Structure and Magnetic Properties. Chemistry 2023:e202303499. [PMID: 38116871 DOI: 10.1002/chem.202303499] [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: 10/23/2023] [Revised: 12/14/2023] [Accepted: 12/18/2023] [Indexed: 12/21/2023]
Abstract
A novel synthetic approach has been employed to synthesize a series of new nitronyl nitroxides: 2-(1-propyl-1H-imidazol-5-yl)- (Ln-Pr ), 2-(1-isopropyl-1H-imidazol-5-yl)- (Li-Pr ) and 2-(1-butyl-1H-imidazol-5-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl (Ln-Bu ). The reaction of Cu(hfac)2 with LR in a 1 : 2 ratio yields mononuclear heterospin complexes [Cu(hfac)2 (LR )2 ] (LR =Ln-Pr , Li-Pr , Ln-Bu ), which have a similar crystal structure to the "jumping" crystals [Cu(hfac)2 (LMe )2 ] that exhibit chemomechanical activity. It was shown that an increase in the alkyl substituent R leads to changes in the crystal packing of the molecules and the absence of chemomechanical activity. Furthermore, it was found that two polymorph modifications of the heterospin complex [Cu(hfac)2 (Ln-Pr )2 ] can be obtained, and magnetic properties of [Cu(hfac)2 (Ln-Pr )2 ] strongly depend on the angle between the planes of the paramagnetic fragment O•-N-C=N→O and the imidazole ring in Ln-Pr .
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Affiliation(s)
- Irina V Golomolzina
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya Str. 3a, 630090, Novosibirsk, Russian Federation
| | - Svyatoslav E Tolstikov
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya Str. 3a, 630090, Novosibirsk, Russian Federation
| | - Kristina A Smirnova
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya Str. 3a, 630090, Novosibirsk, Russian Federation
| | - Sergey V Fokin
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya Str. 3a, 630090, Novosibirsk, Russian Federation
| | - Gleb A Letyagin
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya Str. 3a, 630090, Novosibirsk, Russian Federation
| | - Galina V Romanenko
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya Str. 3a, 630090, Novosibirsk, Russian Federation
| | - Artem S Bogomyakov
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya Str. 3a, 630090, Novosibirsk, Russian Federation
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Zayakin I, Romanenko G, Bagryanskaya I, Ugrak B, Fedin M, Tretyakov E. Catalytic System for Cross-Coupling of Heteroaryl Iodides with a Nitronyl Nitroxide Gold Derivative at Room Temperature. Molecules 2023; 28:7661. [PMID: 38005383 PMCID: PMC10675334 DOI: 10.3390/molecules28227661] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 11/16/2023] [Accepted: 11/16/2023] [Indexed: 11/26/2023] Open
Abstract
A simple and highly effective methodology for the cross-coupling of heteroaryl iodides with NN-AuPPh3 at room temperature is reported. The protocol is based on a novel catalytic system consisting of Pd2(dba)3·CHCl3 and the phosphine ligand MeCgPPh having an adamantane-like framework. The present protocol was found to be well compatible with various heteroaryl iodides, thus opening new horizons in directed synthesis of functionalized nitronyl nitroxides and high-spin molecules.
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Affiliation(s)
- Igor Zayakin
- N. D. Zelinsky Institute of Organic Chemistry, Leninsky Ave. 47, Moscow 119991, Russia; (I.Z.); (B.U.)
| | - Galina Romanenko
- International Tomography Center, Institutskaya Str. 3a, Novosibirsk 630090, Russia;
| | - Irina Bagryanskaya
- N. N. Vorozhtsov Institute of Organic Chemistry, 9 Ac. Lavrentiev Avenue, Novosibirsk 630090, Russia;
| | - Bogdan Ugrak
- N. D. Zelinsky Institute of Organic Chemistry, Leninsky Ave. 47, Moscow 119991, Russia; (I.Z.); (B.U.)
| | - Matvey Fedin
- International Tomography Center, Institutskaya Str. 3a, Novosibirsk 630090, Russia;
| | - Evgeny Tretyakov
- N. D. Zelinsky Institute of Organic Chemistry, Leninsky Ave. 47, Moscow 119991, Russia; (I.Z.); (B.U.)
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Bogomyakov AS, Romanenko GV, Fokin SV, Chubakova ET, Tretyakov EV, Ovcharenko VI. Copper(II) Complexes with CF3-Substituted Spin-Labeled Pyrazoles. RUSS J COORD CHEM+ 2022. [DOI: 10.1134/s1070328422700014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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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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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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Morita T, Fuse S, Nakamura H. Generation of an 4-Isoxazolyl Anion Species: Facile Access to Multifunctionalized Isoxazoles. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608039] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Taiki Morita
- Laboratory for Chemistry and Life Science Institute of Innovative Research; Tokyo Institute of Technology; 4259 Nagatsuta-cho, Midori-ku Yokohama 226-8503 Japan
| | - Shinichiro Fuse
- Laboratory for Chemistry and Life Science Institute of Innovative Research; Tokyo Institute of Technology; 4259 Nagatsuta-cho, Midori-ku Yokohama 226-8503 Japan
| | - Hiroyuki Nakamura
- Laboratory for Chemistry and Life Science Institute of Innovative Research; Tokyo Institute of Technology; 4259 Nagatsuta-cho, Midori-ku Yokohama 226-8503 Japan
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Morita T, Fuse S, Nakamura H. Generation of an 4-Isoxazolyl Anion Species: Facile Access to Multifunctionalized Isoxazoles. Angew Chem Int Ed Engl 2016; 55:13580-13584. [DOI: 10.1002/anie.201608039] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Taiki Morita
- Laboratory for Chemistry and Life Science Institute of Innovative Research; Tokyo Institute of Technology; 4259 Nagatsuta-cho, Midori-ku Yokohama 226-8503 Japan
| | - Shinichiro Fuse
- Laboratory for Chemistry and Life Science Institute of Innovative Research; Tokyo Institute of Technology; 4259 Nagatsuta-cho, Midori-ku Yokohama 226-8503 Japan
| | - Hiroyuki Nakamura
- Laboratory for Chemistry and Life Science Institute of Innovative Research; Tokyo Institute of Technology; 4259 Nagatsuta-cho, Midori-ku Yokohama 226-8503 Japan
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Tretyakov EV, Romanenko GV, Veber SL, Fedin MV, Polushkin AV, Tkacheva AO, Ovcharenko VI. Cu(hfac)2 Complexes with Nitronyl Ketones Structurally Mimicking Nitronyl Nitroxides in Breathing Crystals. Aust J Chem 2015. [DOI: 10.1071/ch14422] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Breathing crystals based on polymer-chain complexes of Cu(hfac)2 (hfac = hexafluoroacetylacetonate) with nitronyl nitroxides represent a new type of molecular magnetic sensors, exhibiting thermally and light-induced structural rearrangements in the spin clusters Cu ← (O∸N<)n accompanied by magnetic anomalies. To shed light on the driving forces of the rearrangements a method for the synthesis of sterically hindered 4-oxo-3,4-dihydro-2H-pyrrole-N-oxides (nitronyl ketones) structurally mimicking nitronyl nitroxides in breathing crystals has been determined. This method employs palladium-catalyzed cross-coupling of 3,3,4-trimethyl-4-nitropentanoic acid chloride with 4-stannylpyrazoles, leading to the formation of nitroketones followed by soft reduction into hydroxylamines, that then undergo self-initiated cyclization into the corresponding nitrones. The radical oxidation of the latter finally yields the target nitronyl ketones. An X-ray diffraction analysis of the nitronyl ketones confirms that their structural characteristics are close to those of the corresponding nitronyl nitroxides. Moreover, upon reaction with Cu(hfac)2, diamagnetic nitronyl ketones form polymer-chain complexes with a ‘head-to-tail’ motif and a structure similar to their analogues containing paramagnetic nitronyl nitroxides. Finally, it has been found that one of the complexes with nitronyl ketones does manifest a purely structural phase transition similar to its copper-nitroxide analogue, but at the same time it does not manifest any signs of a magneto-structural transition characteristic for breathing crystals where a Jahn–Teller axis in the coordination units CuNO4(O∸N<) is flipped. This observation strongly confirms the crucial role of the exchange interactions between spins of copper and nitroxide for the origin of magneto-structural anomalies in breathing crystals.
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Spin transition in the molecular heterospin complex of Cu(hfac)2 with 4,4,5,5-tetramethyl-2-(1-methylpyrazol-5-yl)-4,5-dihydroimidazole-1-oxyl 3-oxide. Russ Chem Bull 2014. [DOI: 10.1007/s11172-013-0089-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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