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Cigl M, Pociecha D, Jakubowski R, Kapuściński S, Kaszyński P. Paramagnetic Liquid Crystals With Close π-π Packing: The Effect of Blatter Radical Planarization on Behavior of Bent-Core Mesogens. Chemistry 2023; 29:e202203288. [PMID: 36524762 DOI: 10.1002/chem.202203288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 11/21/2022] [Accepted: 12/11/2022] [Indexed: 12/23/2022]
Abstract
A new, 19 π-delocalized electrons planar Blatter radical building block was developed and used to obtain paramagnetic bent-core liquid crystals. The mesogens were investigated by optical, thermal, powder XRD and DFT methods in the pure form and as binary mixtures. Comparison of their properties with those of the classical Blatter radical analogues revealed that planarization of the central angular element results in a significantly higher stability of the mesophases and increased molecular organization suitable for the formation of ordered banana and columnar mesophases with tighter π-π interactions. These results indicate access to a new, potentially rich class of functional paramagnetic soft materials.
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Affiliation(s)
- Martin Cigl
- Polish Academy of Sciences, Sienkiewicza 112, 90-363, Łódź, Poland.,Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21, Prague, Czech Republic
| | - Damian Pociecha
- Faculty of Chemistry, University of Warsaw, Zwirki i Wigury 101, 02089, Warsaw, Poland
| | - Rafał Jakubowski
- Polish Academy of Sciences, Sienkiewicza 112, 90-363, Łódź, Poland
| | | | - Piotr Kaszyński
- Polish Academy of Sciences, Sienkiewicza 112, 90-363, Łódź, Poland.,Faculty of Chemistry, University of Łódź, Tamka 12, 91-403, Łódź, Poland.,Department of Chemistry, Middle Tennessee State University, Murfreesboro, TN 37132, USA
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2
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Fershtat LL. Synthesis of 1,4-dihydro-1,2,4-benzotriazin-4-yl radicals (microreview). Chem Heterocycl Compd (N Y) 2022. [DOI: 10.1007/s10593-022-03072-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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3
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Revisiting the Synthesis of Functionally Substituted 1,4-Dihydrobenzo[ e][1,2,4]triazines. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27082575. [PMID: 35458773 PMCID: PMC9031768 DOI: 10.3390/molecules27082575] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 04/11/2022] [Accepted: 04/14/2022] [Indexed: 11/22/2022]
Abstract
A series of novel 1,4-dihydrobenzo[1,2,4][e]triazines bearing an acetyl or ester moiety as a functional group at the C(3) atom of the 1,2,4-triazine ring were synthesized. The synthetic protocol is based on an oxidative cyclization of functionally substituted amidrazones in the presence of DBU and Pd/C. It was found that the developed approach is suitable for the preparation of 1,4-dihydrobenzo[e][1,2,4]triazines, but the corresponding Blatter radicals were isolated only in few cases. In addition, a previously unknown dihydrobenzo[e][1,2,4]triazolo[3,4-c][1,2,4]triazine tricyclic open-shell derivative was prepared. Studies of thermal behavior of the synthesized 1,4-dihydrobenzo[1,2,4][e]triazines revealed their high thermal stability (up to 240–250 °C), which enables their application potential as components of functional organic materials.
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Uchida Y, Sakaguchi T, Oki S, Shimono S, Park J, Sugiyama M, Sato S, Zaytseva E, Mazhukin DG, Tamura R. Magnetically Manipulable Ionic Liquid Crystals Incorporating Neutral Radical Moiety. Chempluschem 2021; 87:e202100352. [PMID: 34636499 DOI: 10.1002/cplu.202100352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/24/2021] [Indexed: 11/11/2022]
Abstract
With a view to fabricating a new remote input-output system by applying functional ionic liquid crystalline (ILC) materials, we have developed novel ILC compounds containing a nitroxide radical unit in the organic cations, which show an enantiotropic smectic A (SmA) phase. We have implemented the magnetic manipulation of a droplet of one of the ILC compounds on the basis of the intermolecular magnetic interactions between radical moieties. This ILC monoradical compound shows a 55 % larger increase in paramagnetic susceptibility at the solid-to-LC melting point in the first heating process than the non-ionic LC monoradical compounds. It is most likely owing to the nanosegregation of strongly bonded ionic and non-ionic moieties. The increased molar magnetic susceptibility is preserved not only in the SmA phase but also in the isotropic liquid and solid phases during the first cooling process.
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Affiliation(s)
- Yoshiaki Uchida
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
| | - Tatsunori Sakaguchi
- Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, 606-8501, Japan
| | - Shigeaki Oki
- Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, 606-8501, Japan
| | - Satoshi Shimono
- Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, 606-8501, Japan
| | - Jayeong Park
- Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu-cho, Matsue, Shimane, 690-8504, Japan
| | - Masahito Sugiyama
- Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, 606-8501, Japan
| | - Shuichi Sato
- Osaka Dental University, Hirakata, Osaka, 573-114, Japan
| | - Elena Zaytseva
- Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, 606-8501, Japan.,Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, 3 Akademika Lavrentieva Ave., Novosibirsk, 630090, Russia
| | - Dmitrii G Mazhukin
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of Russian Academy of Sciences, 9 Akademika Lavrentieva Ave., Novosibirsk, 630090, Russia.,Novosibirsk State University, 2 Pirogova St., Novosibirsk, 630090, Russia
| | - Rui Tamura
- Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, 606-8501, Japan
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Ciastek-Iskrzycka S, Szczytko J, Monobe H, Pociecha D, Jasiński M, Kaszyński P. Paramagnetic ionic liquid crystals: Ion conductive bent-core derivatives of stable radicals. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Abdulnabi NM, Abdul Razzaq Al-Obaidy MM, Tomi IHR, Jaffer HJ. New calamitic mesogens derived from a furan ring: Synthesis, characterization and study of their mesomorphic behavior. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114562] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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7
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Bartos P, Hande AA, Pietrzak A, Chrostowska A, Kaszyński P. Substituent effects on the electronic structure of the flat Blatter radical: correlation analysis of experimental and computational data. NEW J CHEM 2021. [DOI: 10.1039/d1nj05137g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Functionalized flat Blatter radicals were obtained and substituent effects on spectroscopy, electrochemistry, and stability were investigated by correlation and DFT methods.
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Affiliation(s)
- Paulina Bartos
- Faculty of Chemistry, University of Łódź, 91-403 Łódź, Poland
| | - Aniket A. Hande
- Faculty of Chemistry, University of Łódź, 91-403 Łódź, Poland
- Université de Pau et des Pays de l’Adour E2S UPPA, CNRS, IPREM 64000, Pau, France
| | - Anna Pietrzak
- Faculty of Chemistry, Łódź University of Technology, Żeromskiego 116, 90-024, Łódź, Poland
| | - Anna Chrostowska
- Université de Pau et des Pays de l’Adour E2S UPPA, CNRS, IPREM 64000, Pau, France
| | - Piotr Kaszyński
- Faculty of Chemistry, University of Łódź, 91-403 Łódź, Poland
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, 90-363 Łódź, Poland
- Department of Chemistry, Middle Tennessee State University, Murfreesboro, TN, 37132, USA
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Spin Symmetry Breaking: Superparamagnetic and Spin Glass-Like Behavior Observed in Rod-Like Liquid Crystalline Organic Compounds Contacting Nitroxide Radical Spins. Symmetry (Basel) 2020. [DOI: 10.3390/sym12111910] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Liquid crystalline (LC) organic radicals were expected to show a novel non-linear magnetic response to external magnetic and electric fields due to their coherent collective molecular motion. We have found that a series of chiral and achiral all-organic LC radicals having one or two five-membered cyclic nitroxide radical (PROXYL) units in the core position and, thereby, with a negative dielectric anisotropy exhibit spin glass (SG)-like superparamagnetic features, such as a magnetic hysteresis (referred to as ‘positive magneto-LC effect’), and thermal and impurity effects during a heating and cooling cycle in weak magnetic fields. Furthermore, for the first time, a nonlinear magneto-electric (ME) effect has been detected with respect to one of the LC radicals showing a ferroelectric (chiral Smectic C) phase. The mechanism of the positive magneto-LC effect is proposed and discussed by comparison of our experimental results with the well-known magnetic properties of SG materials and on the basis of the experimental results of a nonlinear ME effect. A recent theoretical study by means of molecular dynamic simulation and density functional theory calculations suggesting the high possibility of conservation of the memory of spin-spin interactions between magnetic moments owing to the ceaseless molecular contacts in the LC and isotropic states is briefly mentioned as well.
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Bazzi F, Danke AJ, Lawson DB, Manoli M, Leitus GM, Koutentis PA, Constantinides CP. 1-(2-Methoxyphenyl)-3-phenyl-1,4-dihydro-1,2,4-benzotriazin-4-yl: a tricky “structure-to-magnetism” correlation aided by DFT calculations. CrystEngComm 2020. [DOI: 10.1039/d0ce00669f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
1-(2-Methoxyphenyl)-3-phenyl-1,4-dihydro-1,2,4-benzotriazin-4-yl (2) is a Blatter radical with a challenging structure-to-magnetism correlation.
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Affiliation(s)
- Fadwat Bazzi
- Department of Natural Sciences
- University of Michigan – Dearborn
- Dearborn
- USA
| | - Alexander J. Danke
- Department of Natural Sciences
- University of Michigan – Dearborn
- Dearborn
- USA
| | - Daniel B. Lawson
- Department of Natural Sciences
- University of Michigan – Dearborn
- Dearborn
- USA
| | - Maria Manoli
- Department of Chemistry
- University of Cyprus
- 1678 Nicosia
- Cyprus
| | - Gregory M. Leitus
- Chemical Research Support Unit
- Weizmann Institute of Science
- 7610001 Rehovot
- Israel
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