1
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Lai W, Bu Y, Xiao W, Liu H, Guo J, Zhao L, Yang K, Xie S, Zeng Z. Magnetic Bistability in an Organic Radical-Based Charge Transfer Cocrystal. J Am Chem Soc 2023; 145:24328-24337. [PMID: 37878504 DOI: 10.1021/jacs.3c09226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2023]
Abstract
We report herein an organic charge transfer cocrystal complex, consisting of a stable radical TPVr and an electron acceptor TCNQF4, as a rare sort of all-organic-based magnetic bistable materials with a thermally activated magnetic hysteresis loop over the temperature range from 170 to 260 K. Detailed X-ray crystallographic studies and theoretical calculations revealed that while a π-associated radical anion dimer was formed upon an integer charge transfer process from TPVr to the TCNQF4 molecules within the cocrystal lattice, the resulting TCNQF4·- π-dimers were found to exhibit varied intradimer π-stacking distances and singly occupied molecular orbital overlaps at different temperatures, thus yielding two different singlet states with distinct singlet-triplet gaps above and below the loop, which eventually contributed to the thermally excited molecular magnetic bistability.
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Affiliation(s)
- Weiming Lai
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
- Shenzhen Research Institute of Hunan University, Nanshan District, Shenzhen 518000, China
| | - Yanru Bu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
- Shenzhen Research Institute of Hunan University, Nanshan District, Shenzhen 518000, China
| | - Wang Xiao
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
- Shenzhen Research Institute of Hunan University, Nanshan District, Shenzhen 518000, China
| | - Haohao Liu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
- Shenzhen Research Institute of Hunan University, Nanshan District, Shenzhen 518000, China
| | - Jing Guo
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
- Shenzhen Research Institute of Hunan University, Nanshan District, Shenzhen 518000, China
| | - Longfeng Zhao
- School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Kun Yang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
- Shenzhen Research Institute of Hunan University, Nanshan District, Shenzhen 518000, China
| | - Sheng Xie
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
- Shenzhen Research Institute of Hunan University, Nanshan District, Shenzhen 518000, China
| | - Zebing Zeng
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
- Shenzhen Research Institute of Hunan University, Nanshan District, Shenzhen 518000, China
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2
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Shu C, Yang Z, Rajca A. From Stable Radicals to Thermally Robust High-Spin Diradicals and Triradicals. Chem Rev 2023; 123:11954-12003. [PMID: 37831948 DOI: 10.1021/acs.chemrev.3c00406] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2023]
Abstract
Stable radicals and thermally robust high-spin di- and triradicals have emerged as important organic materials due to their promising applications in diverse fields. New fundamental properties, such as SOMO/HOMO inversion of orbital energies, are explored for the design of new stable radicals, including highly luminescent ones with good photostability. A relation with the singlet-triplet energy gap in the corresponding diradicals is proposed. Thermally robust high-spin di- and triradicals, with energy gaps that are comparable to or greater than a thermal energy at room temperature, are more challenging to synthesize but more rewarding. We summarize a number of high-spin di- and triradicals, based on nitronyl nitroxides that provide a relation between the experimental pairwise exchange coupling constant J/k in the high-spin species vs experimental hyperfine coupling constants in the corresponding monoradicals. This relation allows us to identify outliers, which may correspond to radicals where J/k is not measured with sufficient accuracy. Double helical high-spin diradicals, in which spin density is delocalized over the chiral π-system, have been barely explored, with the sole example of such high-spin diradical possessing alternant π-system with Kekulé resonance form. Finally, we discuss a high-spin diradical with electrical conductivity and derivatives of triangulene diradicals.
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Affiliation(s)
- Chan Shu
- Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588-0304, United States
| | - Zhimin Yang
- Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588-0304, United States
| | - Andrzej Rajca
- Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588-0304, United States
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3
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Roncero-Barrero C, Ribas-Ariño J, Moreira IDPR, Deumal M. Magnetic coupling and spin ordering in bisdithiazolyl, thiaselenazolyl, and bisdiselenazolyl molecular materials. Dalton Trans 2022; 51:13032-13045. [PMID: 35968924 DOI: 10.1039/d2dt01340a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The use of purely organic materials is a promising approach for the miniaturization of devices due to their interesting optical, electronic and magnetic properties. Bisdithiazolyl-based bisDTA compounds have emerged as promising candidates for radical-based single component conductors exhibiting simultaneously magnetic properties. Our computational work focuses on the intriguing magnetism of 4 isostructural pyridine-bridged bisDTA-multifunctional materials triggered by their magnetic and conducting properties being strongly dependent on the different S/Se ratios in the neutral radical skeleton: specifically, bisdithiazolyl (S,S) displays no magnetic order at low temperatures, thiaselenazolyl (Se,S) exhibits spin-canted antiferromagnetism (AFM), and both (S,Se) and bisdiselenazolyl (Se,Se) behave as bulk ferromagnets (FM). Our results reveal that (1) the magnetic response depends on the existence of an intricate network of both AFM and FM spin exchange JAB couplings between neighbouring radicals; and (2) the structural arrangement of π-stacked pairs of radicals sits on a point in the configurational space that is very close to a crossover region where JAB switches from AFM to FM. Indeed, for bulk FM, the experimental response is only accounted for when considering an ab initio optimised crystal structure able to portray adequately the electronic structure of bisDTAs in the region close to the temperature at which magnetic ordering emerges. Magneto-structural correlation maps show the large sensitivity of JAB to very small structural changes with temperature along the π-stacks that lead to drastic changes in the magnetic properties. Clearly, the understanding of magnetism in the title bisDTA compounds is decisive to rationally tailor the properties of multifunctional materials by subtle structural modifications of their crystal packing.
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Affiliation(s)
- C Roncero-Barrero
- Secció Química Física, Dept. Ciència de Materials i Química Física, and Institut de Química Teòrica i Computacional IQTCUB, Universitat de Barcelona, Martí i Franquès, 1, E08028 Barcelona, Spain.
| | - J Ribas-Ariño
- Secció Química Física, Dept. Ciència de Materials i Química Física, and Institut de Química Teòrica i Computacional IQTCUB, Universitat de Barcelona, Martí i Franquès, 1, E08028 Barcelona, Spain.
| | - I de P R Moreira
- Secció Química Física, Dept. Ciència de Materials i Química Física, and Institut de Química Teòrica i Computacional IQTCUB, Universitat de Barcelona, Martí i Franquès, 1, E08028 Barcelona, Spain.
| | - M Deumal
- Secció Química Física, Dept. Ciència de Materials i Química Física, and Institut de Química Teòrica i Computacional IQTCUB, Universitat de Barcelona, Martí i Franquès, 1, E08028 Barcelona, Spain.
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4
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Takebayashi S, Fayzullin RR, Bansal R. Direct observation of reversible bond homolysis by 2D EXSY NMR. Chem Sci 2022; 13:9202-9209. [PMID: 36093009 PMCID: PMC9383717 DOI: 10.1039/d2sc03028d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 07/07/2022] [Indexed: 11/21/2022] Open
Abstract
Bond homolysis is one of the most fundamental bond cleavage mechanisms. Thus, understanding of bond homolysis influences the development of a wide range of chemistry. Photolytic bond homolysis and its reverse process have been observed directly using time-resolved spectroscopy. However, direct observation of reversible bond homolysis remains elusive. Here, we report the direct observation of reversible Co-Co bond homolysis using two-dimensional nuclear magnetic resonance exchange spectroscopy (2D EXSY NMR). The characterization of species involved in this homolysis is firmly supported by diffusion ordered NMR spectroscopy (DOSY NMR). The unambiguous characterization of the Co-Co bond homolysis process enabled us to study ligand steric and electronic factors that influence the strength of the Co-Co bond. Understanding of these factors will contribute to rational design of multimetallic complexes with desired physical properties or catalytic activity.
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Affiliation(s)
- Satoshi Takebayashi
- Science and Technology Group Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha Onna-son Okinawa 904-0495 Japan
| | - Robert R Fayzullin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences 8 Arbuzov Street Kazan 420088 Russian Federation
| | - Richa Bansal
- Science and Technology Group Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha Onna-son Okinawa 904-0495 Japan
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5
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Molčanov K, Milašinović V, Kojić-Prodić B, Maltar-Strmečki N, You J, Šantić A, Kanižaj L, Stilinović V, Fotović L. Semiconductive 2D arrays of pancake-bonded oligomers of partially charged TCNQ radicals. IUCRJ 2022; 9:449-467. [PMID: 35844480 PMCID: PMC9252159 DOI: 10.1107/s2052252522004717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 05/03/2022] [Indexed: 06/15/2023]
Abstract
Multicentre two-electron (mc/2e or 'pancake bonding') bonding between 7,7,8,8-tetra-cyano-quinodi-methane (TCNQ) radical anions was studied on its 14 novel salts with planar organic cations. The formal charges of the TCNQδ- moieties are -1/2 and -2/3, and they form mc/2e bonded dimers, trimers and tetramers which are further stacked into extended arrays. Multicentre bonding within these oligomers is characterized by short interplanar separations of 2.9-3.2 Å; distances between the oligomers are larger, typically >3.3 Å. The stacks are laterally connected by C-H⋯N hydrogen bonding, forming 2D arrays. The nature of mc/2e bonding is characterized by structural, magnetic and electrical data. The compounds are found to be semiconductors, and high conductivity [10-2 (Ω cm)-1] correlates with short interplanar distances between pancake-bonded oligomers.
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Affiliation(s)
- Krešimir Molčanov
- Department of Physical Chemistry, Rudjer Bošković Institute, Bijenička 54, Zagreb 10000, Croatia
| | - Valentina Milašinović
- Department of Physical Chemistry, Rudjer Bošković Institute, Bijenička 54, Zagreb 10000, Croatia
| | - Biserka Kojić-Prodić
- Department of Physical Chemistry, Rudjer Bošković Institute, Bijenička 54, Zagreb 10000, Croatia
| | - Nadica Maltar-Strmečki
- Department of Physical Chemistry, Rudjer Bošković Institute, Bijenička 54, Zagreb 10000, Croatia
| | - Jiangyang You
- Department of Physical Chemistry, Rudjer Bošković Institute, Bijenička 54, Zagreb 10000, Croatia
| | - Ana Šantić
- Department of Materials Chemistry, Rudjer Bošković Institute, Bijenička 54, Zagreb 10000, Croatia
| | - Lidija Kanižaj
- Department of Materials Physics, Rudjer Bošković Institute, Bijenička 54, Zagreb 10000, Croatia
| | - Vladimir Stilinović
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, Zagreb HR-10000, Croatia
| | - Luka Fotović
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, Zagreb HR-10000, Croatia
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6
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Roncero-Barrero C, Ribas-Ariño J, Deumal M, Moreira IDPR. Electronic structure and magnetic coupling in selenium substituted pyridine-bridged bisdithiazolyl multifunctional molecular materials. Phys Chem Chem Phys 2022; 24:12196-12207. [PMID: 35551353 DOI: 10.1039/d2cp00415a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Bisdithiazolyl radicals have furnished in recent years multiple examples of molecular materials with promising conductive and magnetic properties. The electronic band structure and magnetic ordering in four different isostructural pyridine-bridged bisdithiazolyl and Selenium substituted compounds have been studied by means of hybrid DFT based methods as implemented in the CRYSTAL code. The full rationalization of the properties of these multifunctional magnetic molecular materials requires a careful description of their complex open-shell electronic structure. The results describe the systems as narrow band (0.2-0.3 eV dispersion) open-shell semiconductors with a gap of 1.15-1.40 eV between the valence and conducting bands. The bands defining the insulating gap are dominated by orbital contributions arising from the heteroatoms sitting in the outer rings. A low energy closed-shell metallic solution is found at 0.25-0.35 eV above the magnetic solutions thus suggesting a complex mechanism for electric conduction with band and hopping contributions. The observed trend of the conductivity is in line with the variation of the insulating gap but more rigorous modelling is required to take into account the details of the band structure of the systems. For all the systems the spin density is well localised on the molecular units and is independent of the magnetic solution. Thus the system can be described as an ensemble of well-defined S = 1/2 magnetic centres using a two-body Heisenberg-Dirac-van Vleck spin Hamiltonian. The lowest energy electronic solutions are in line with the observed magnetic behaviour at low temperature. The set of competing magnetic exchange interactions that emerges from using a suitable mapping to consistently describe the low energy magnetic solutions explains the variety of magnetic responses (absence of long-range magnetic order, antiferromagnetism or ferromagnetism) of the four studied compounds at low temperatures.
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Affiliation(s)
- Cristina Roncero-Barrero
- Departament de Ciència de Materials i Química Física, Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain.,Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Jordi Ribas-Ariño
- Departament de Ciència de Materials i Química Física, Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain.,Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Mercè Deumal
- Departament de Ciència de Materials i Química Física, Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain.,Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Ibério de P R Moreira
- Departament de Ciència de Materials i Química Física, Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain.,Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain
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7
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Yamaguchi Y, Takano R, Ishida T. Pincer-type bisnitroxide radicals involving tetramethylenedioxy and o-xylylenedioxy bridges. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153841] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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8
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Dong X, Sun Q, Feng Z, Ruan H, Tang S, Liu M, Zhao Y, Su Y, Wang X. Room‐Temperature
Reversible
σ‐Dimerization
of a Phenalenyl Radical. CHINESE J CHEM 2022. [DOI: 10.1002/cjoc.202200082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Xue Dong
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University Nanjing 210023 China
| | - Quanchun Sun
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University Nanjing 210023 China
| | - Zhongtao Feng
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University Nanjing 210023 China
| | - Huapeng Ruan
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University Nanjing 210023 China
| | - Shuxuan Tang
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University Nanjing 210023 China
| | - Min Liu
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University Nanjing 210023 China
| | - Yue Zhao
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University Nanjing 210023 China
| | - Yuanting Su
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou 215123 China
| | - Xinping Wang
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University Nanjing 210023 China
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9
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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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10
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Taponen AI, Ayadi A, Lahtinen MK, Oyarzabal I, Bonhommeau S, Rouzières M, Mathonière C, Tuononen HM, Clérac R, Mailman A. Room-Temperature Magnetic Bistability in a Salt of Organic Radical Ions. J Am Chem Soc 2021; 143:15912-15917. [PMID: 34547207 DOI: 10.1021/jacs.1c07468] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Cocrystallization of 7,7',8,8'-tetracyanoquinodimethane radical anion (TCNQ-•) and 3-methylpyridinium-1,2,3,5-dithiadiazolyl radical cation (3-MepyDTDA+•) afforded isostructural acetonitrile (MeCN) or propionitrile (EtCN) solvates containing cofacial π dimers of homologous components. Loss of lattice solvent from the diamagnetic solvates above 366 K affords a high-temperature paramagnetic phase containing discrete TCNQ-• and weakly bound π dimers of 3-MepyDTDA+•, as evidenced by X-ray diffraction methods and magnetic susceptibility measurements. Below 268 K, a first-order phase transition occurs, leading to a low-temperature diamagnetic phase with TCNQ-• σ dimer and π dimers of 3-MepyDTDA+•. This study reveals the first example of cooperative interactions between two different organic radical ions leading to magnetic bistability, and these results are central to the future design of multicomponent functional molecular materials.
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Affiliation(s)
- Anni I Taponen
- NanoScience Centre, Department of Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - Awatef Ayadi
- NanoScience Centre, Department of Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - Manu K Lahtinen
- NanoScience Centre, Department of Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - Itziar Oyarzabal
- Univ. Bordeaux, CNRS, Centre de Recherche Paul Pascal, UMR5031, F-33600 Pessac, France.,BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, ES-48940 Leioa, Spain.,IKERBASQUE, Basque Foundation for Science, ES-48009 Bilbao, Spain
| | | | - Mathieu Rouzières
- Univ. Bordeaux, CNRS, Centre de Recherche Paul Pascal, UMR5031, F-33600 Pessac, France
| | - Corine Mathonière
- Univ. Bordeaux, CNRS, Centre de Recherche Paul Pascal, UMR5031, F-33600 Pessac, France
| | - Heikki M Tuononen
- NanoScience Centre, Department of Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - Rodolphe Clérac
- Univ. Bordeaux, CNRS, Centre de Recherche Paul Pascal, UMR5031, F-33600 Pessac, France
| | - Aaron Mailman
- NanoScience Centre, Department of Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
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11
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Koike T, Nukazawa T, Iwamoto T. Conformationally Switchable Silylone: Electron Redistribution Accompanied by Ligand Reorientation around a Monatomic Silicon. J Am Chem Soc 2021; 143:14332-14341. [PMID: 34448394 DOI: 10.1021/jacs.1c06654] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Complexes that could be switched between two electronic states by external stimuli have attracted much attention for their potential application in molecular devices. However, a realization of such a phenomenon with low-valent main-group element-centered complexes remains challenging. Herein, we report the synthesis of cyclic (alkyl)(amino)silylene (CAASi)-ligated monatomic silicon(0) complexes (silylones). The bis(CAASi)-ligated silylone adopts a π-localized ylidene structure (greenish-black color) in the solid state and a π-delocalized ylidene structure (dark-purple color) in solution that could be reversibly switched upon phase transfer (ylidene [L: → :Si = L ↔ L = Si: ← :L]). The observed remarkable difference in the physical properties of the two isomers is attributed to the balanced steric demand and redox noninnocent character of the CAASi ligand which are altered by the orientation of the two terminal ligands with respect to the Si-Si-Si plane: twisted structure (π-localized ylidene) and planar structure (π-delocalized ylidene). Conversely, the CAASi/CDASi-ligated heteroleptic silylone (CDASi = cyclic dialkylsilylene) only exhibited the twisted π-localized ylidene structure regardless of the phase. The synthesized silylones also proved themselves as monatomic silicon surrogates. Thermolysis of the silylones in the presence of an ethane-1,2-diimine afforded the corresponding diaminosilylenes. Analyses of the products suggested a stepwise mechanism that proceeds via a disilavinylidene intermediate.
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Affiliation(s)
- Taichi Koike
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Takumi Nukazawa
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Takeaki Iwamoto
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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12
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Richardson JG, Mizuno A, Shuku Y, Awaga K, Robertson N, Morrison CA, Warren MR, Allan DR, Moggach SA. Evaluating the high-pressure structural response and crystal lattice interactions of the magnetically-bistable organic radical TTTA. CrystEngComm 2021. [DOI: 10.1039/d1ce00577d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Paramagnetic suppression in TTTA at pressure is caused by a steady decrease in the separation between moieties containing the radical electron along π-stacking chains with no phase transition.
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Affiliation(s)
| | - Asato Mizuno
- Department of Chemistry and Integrated Research Consortium on Chemical Sciences (IRCCS)
- Nagoya University
- Nagoya
- 464-8602 Japan
| | - Yoshiaki Shuku
- Department of Chemistry and Integrated Research Consortium on Chemical Sciences (IRCCS)
- Nagoya University
- Nagoya
- 464-8602 Japan
| | - Kunio Awaga
- Department of Chemistry and Integrated Research Consortium on Chemical Sciences (IRCCS)
- Nagoya University
- Nagoya
- 464-8602 Japan
| | - Neil Robertson
- EaStCHEM School of Chemistry
- University of Edinburgh
- Edinburgh
- UK
| | | | - Mark R. Warren
- Diamond Light Source
- Diamond House
- Harwell Science & Innovation Campus
- Didcot
- UK
| | - David R. Allan
- Diamond Light Source
- Diamond House
- Harwell Science & Innovation Campus
- Didcot
- UK
| | - Stephen A. Moggach
- Centre for Microscopy, Characterisation and Analysis
- University of Western Australia
- Perth
- Australia
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13
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Rakitin OА. Synthesis of Sulfur-Containing Heterocycles by Electrophilic Addition Reactions of Disulfur Dichloride. Chem Heterocycl Compd (N Y) 2020. [DOI: 10.1007/s10593-020-02740-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Volkova YM, Makarov AY, Pritchina EA, Gritsan NP, Zibarev AV. Herz radicals: chemistry and materials science. MENDELEEV COMMUNICATIONS 2020. [DOI: 10.1016/j.mencom.2020.07.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Su SQ, Wu SQ, Baker ML, Bencok P, Azuma N, Miyazaki Y, Nakano M, Kang S, Shiota Y, Yoshizawa K, Kanegawa S, Sato O. Quenching and Restoration of Orbital Angular Momentum through a Dynamic Bond in a Cobalt(II) Complex. J Am Chem Soc 2020; 142:11434-11441. [DOI: 10.1021/jacs.0c02257] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Sheng-Qun Su
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Shu-Qi Wu
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Michael L. Baker
- The University of Manchester at Harwell, Didcot, OX11 OFA, United Kingdom
- Department of Chemistry, The University of Manchester, Manchester M139PL, United Kingdom
| | - Peter Bencok
- Diamond Light Source, Science Division, Didcot OX11 0DE, United Kingdom
| | - Nobuaki Azuma
- Research Core for Interdisciplinary Science, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Yuji Miyazaki
- Research Center for Thermal and Entropic Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Motohiro Nakano
- Research Center for Thermal and Entropic Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Soonchul Kang
- Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Shinji Kanegawa
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Osamu Sato
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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16
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Alkan M, Rogachev AY. Coupling of two curved polyaromatic radical-anions: stabilization of dimers by counterions. Phys Chem Chem Phys 2020; 22:6716-6726. [PMID: 32163075 DOI: 10.1039/c9cp06935f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, a comprehensive theoretical investigation of both kinetic and thermodynamic stabilities was performed for dimeric dianionic systems (C20H10)22- and (C28H14)22-, neutralized by two alkali metal cations. The influence of the counterions was of primary interest. The impact of the additional/spectator ligand(s) was elucidated by considering adducts with four molecules of diglyme or two molecules of 18-crown-6 ether. Importantly, both types of systems - in the form of contact-ion pair (CIP) and solvent-separated ion pair (SSIP) - were considered. The SSIP set was augmented by the adduct, in which the dimeric dianionic species were neutralized with purely organic cations N(CH3)4+ and P(CH3)4+. Detailed analysis of the bonding revealed that the presence of the counterions made these systems thermodynamically stable. This finding is in sharp contrast with results obtained for isolated (PAH)22- systems, which were previously found to be thermodynamically unstable, but kinetically persistent. The introduction of the alkali metal cations to the system significantly increases the ionic term (ΔEelstat), whereas the repulsive ΔEPauli one was found to be substantially reduced. Considering that the orbital component (ΔEorb) exhibited only a moderate decrease and the preparation energy (ΔEprep) showed no changes, the above-mentioned changes in ΔEelstat and ΔEPauli provided a clear explanation for the increase of the thermodynamic stability of the target species. Importantly, a clear correlation between the size of the alkali metal cation and stability of the target dimeric product was established. Thermodynamic stability of the system rises with a decrease in the size of M+ due to enlargement of the ΔEorb. Evaluated energy barriers (as spin-crossing points between singlet and triplet energy surfaces) were found to be equal to +15.85 kcal mol-1 and +18.5 kcal mol-1 for [(Cs+)2{(C20H10)22-}] and [(Cs+)2{(C28H14)22-}], respectively, which is substantially higher than those calculated for isolated (PAH)22- systems (+10.00 kcal mol-1 for (C20H10)22- and +12.35 kcal mol-1 for (C28H14)22-). Thus, this study identified the presence of counterions as the key factor, which have a dramatic influence on the thermodynamic and kinetic stabilities of the aimed dianionic dimeric systems, which are formed by two curved polyaromatic monoanion-radicals.
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Affiliation(s)
- Melisa Alkan
- Department of Chemistry, Illinois Institute of Technology, Chicago, IL 60616, USA.
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17
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Tse JS. A chemical perspective on high pressure crystal structures and properties. Natl Sci Rev 2020; 7:149-169. [PMID: 34692029 PMCID: PMC8289026 DOI: 10.1093/nsr/nwz144] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 07/25/2019] [Accepted: 08/20/2019] [Indexed: 11/13/2022] Open
Abstract
The general availability of third generation synchrotron sources has ushered in a new era of high pressure research. The crystal structure of materials under compression can now be determined by X-ray diffraction using powder samples and, more recently, from multi-nano single crystal diffraction. Concurrently, these experimental advancements are accompanied by a rapid increase in computational capacity and capability, enabling the application of sophisticated quantum calculations to explore a variety of material properties. One of the early surprises is the finding that simple metallic elements do not conform to the general expectation of adopting 3D close-pack structures at high pressure. Instead, many novel open structures have been identified with no known analogues at ambient pressure. The occurrence of these structural types appears to be random with no rules governing their formation. The adoption of an open structure at high pressure suggested the presence of directional bonds. Therefore, a localized atomic hybrid orbital description of the chemical bonding may be appropriate. Here, the theoretical foundation and experimental evidence supporting this approach to the elucidation of the high pressure crystal structures of group I and II elements and polyhydrides are reviewed. It is desirable and advantageous to extend and apply established chemical principles to the study of the chemistry and chemical bonding of materials at high pressure.
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Affiliation(s)
- John S Tse
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
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18
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Dragulescu-Andrasi A, Filatov AS, Oakley RT, Li X, Lekin K, Huq A, Pak C, Greer SM, McKay J, Jo M, Lengyel J, Hung I, Maradzike E, DePrince AE, Stoian SA, Hill S, Hu YY, Shatruk M. Radical Dimerization in a Plastic Organic Crystal Leads to Structural and Magnetic Bistability with Wide Thermal Hysteresis. J Am Chem Soc 2019; 141:17989-17994. [DOI: 10.1021/jacs.9b09533] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Alina Dragulescu-Andrasi
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Alexander S. Filatov
- Department of Chemistry, University of Chicago, Chicago, Illinois 32306, United States
| | - Richard T. Oakley
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Xiang Li
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Kristina Lekin
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Ashfia Huq
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Chongin Pak
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Samuel M. Greer
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Johannes McKay
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Minyoung Jo
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Jeff Lengyel
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Ivan Hung
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Elvis Maradzike
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - A. Eugene DePrince
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Sebastian A. Stoian
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Stephen Hill
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
- Department of Physics, Florida State University, Tallahassee, Florida 32306, United States
| | - Yan-Yan Hu
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Michael Shatruk
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
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19
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Climent C, Vela S, Jornet-Somoza J, Deumal M. Revising the common understanding of metamagnetism in the molecule-based bisdithiazolyl BDTMe compound. Phys Chem Chem Phys 2019; 21:12184-12191. [PMID: 31147665 DOI: 10.1039/c9cp00467j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The BDTMe molecule-based material is the first example of a thiazyl radical to exhibit metamagnetic behavior. Contrary to the common idea that metamagnetism occurs in low-dimensional systems, it is found that BDTMe magnetic topology consists of a complex 3D network of almost isotropic ferromagnetic spin-ladders that are coupled ferromagnetically and further connected by some weaker antiferromagnetic interactions. Calculated magnetic susceptibility χT(T) data is in agreement with experiment. Calculated M(H) data clearly show the typical sigmoidal shape of a metamagnet at temperatures below 2 K. The calculated critical field becomes more apparent in the dM/dH(H) plot, being in very good agreement with experiment. Our computational study concludes that the magnetic topology of BDTMe is preserved throughout the entire experimental range of temperatures (0-100 K). Accordingly, the ground state is the same irrespective of the temperature at which we study the BDTMe crystal. Revising the commonly accepted understanding of a metamagnet explained as ground state changing from antiferromagnetic to ferromagnetic, the Boltzmann population of the different states is here suggested to be the key concept: at 2 K the ground singlet state has more weight (24%) than at 10 K (1.5%), where excited states have an important role. Changes in the antiferromagnetic interactions that couple the ferromagnetic skeleton of BDTMe will directly affect the population of the distinct states that belong to a given magnetic topology and thus its magnetic response. Accordingly, this strategy could be valid for a wide range of bisdithiazolyl BDT-compounds whose magnetism can be tuned by means of weak antiferromagnetic interactions.
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Affiliation(s)
- Clàudia Climent
- Secció Química Física, Dept. Ciència de Materials i Química Física & IQTCUB, Universitat de Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain. and Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Sergi Vela
- Secció Química Física, Dept. Ciència de Materials i Química Física & IQTCUB, Universitat de Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain. and Laboratory for Computational Molecular Design (LCMD), Institute of Chemical Sciences and Engineering, EPFL, CH-1015 Lausanne, Switzerland
| | - Joaquim Jornet-Somoza
- Secció Química Física, Dept. Ciència de Materials i Química Física & IQTCUB, Universitat de Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain. and Theory Department, The Max Planck Institute for the Structure and Dynamics of Matter (MPSD), Bldg. 99 (CFEL), Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Mercè Deumal
- Secció Química Física, Dept. Ciència de Materials i Química Física & IQTCUB, Universitat de Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain.
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20
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Molčanov K, Kojić-Prodić B. Towards understanding π-stacking interactions between non-aromatic rings. IUCRJ 2019; 6:156-166. [PMID: 30867913 PMCID: PMC6400184 DOI: 10.1107/s2052252519000186] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 01/04/2019] [Indexed: 05/16/2023]
Abstract
The first systematic study of π interactions between non-aromatic rings, based on the authors' own results from an experimental X-ray charge-density analysis assisted by quantum chemical calculations, is presented. The landmark (non-aromatic) examples include quinoid rings, planar radicals and metal-chelate rings. The results can be summarized as: (i) non-aromatic planar polyenic rings can be stacked, (ii) interactions are more pronounced between systems or rings with little or no π-electron delocalization (e.g. quinones) than those involving delocalized systems (e.g. aromatics), and (iii) the main component of the interaction is electrostatic/multipolar between closed-shell rings, whereas (iv) interactions between radicals involve a significant covalent contribution (multicentric bonding). Thus, stacking covers a wide range of interactions and energies, ranging from weak dispersion to unlocalized two-electron multicentric covalent bonding ('pancake bonding'), allowing a face-to-face stacking arrangement in some chemical species (quinone anions). The predominant interaction in a particular stacked system modulates the physical properties and defines a strategy for crystal engineering of functional materials.
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Affiliation(s)
- Krešimir Molčanov
- Department of Physical Chemistry, Rudjer Bošković Institute, Bijenička 54, Zagreb 10000, Croatia
| | - Biserka Kojić-Prodić
- Department of Physical Chemistry, Rudjer Bošković Institute, Bijenička 54, Zagreb 10000, Croatia
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21
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Stekovic D, Bag P, Shankhari P, Fokwa BPT, Itkis ME. Effect of Substitution on the Hysteretic Phase Transition in a Bistable Phenalenyl-Based Neutral Radical Molecular Conductor. Chemistry 2019; 25:4166-4174. [PMID: 30588670 DOI: 10.1002/chem.201805816] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Indexed: 11/10/2022]
Abstract
The ability to tune the physical properties of bistable organic functional materials by means of chemistry can facilitate their development for molecular electronic switching components. The butylamine-containing biphenalenyl boron neutral radical, [Bu]2 B, crystalline compound has recently attracted significant attention by displaying a hysteretic phase transition accompanied by simultaneous bistability in magnetic, electrical, and optical properties close to room temperature. In this report, substitutional doping was applied to [Bu]2 B by crystallizing solid solutions of bistable [Bu]2 B and its non-radical-containing counterpart [Bu]2 Be. With increasing doping degree, the hysteretic phase transition is gradually suppressed in terms of reducing the height, but conserves the width of the hysteresis loop as observed through magnetic susceptibility and electrical conductivity measurements. At the critical doping level of about 6 %, the abrupt transformation of the crystal structure to that of the pure [Bu]2 Be crystal packing was observed, accompanied by a complete collapse of the hysteresis loop. Further study of the structure-properties relationships of bistable neutral radical conductors based on the [Bu]2 B host can be conducted utilizing a variety of biphenalenyl-based molecular conductors.
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Affiliation(s)
- Dejan Stekovic
- Department of Chemistry, University of California, Riverside, Riverside, CA, 92521, USA.,Center for Nanoscale Science and Engineering, University of California, Riverside, Riverside, CA, 92521, USA
| | - Pradip Bag
- Department of Chemistry, University of California, Riverside, Riverside, CA, 92521, USA.,Center for Nanoscale Science and Engineering, University of California, Riverside, Riverside, CA, 92521, USA
| | - Pritam Shankhari
- Department of Chemistry, University of California, Riverside, Riverside, CA, 92521, USA
| | - Boniface P T Fokwa
- Department of Chemistry, University of California, Riverside, Riverside, CA, 92521, USA.,Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA, 92521, USA
| | - Mikhail E Itkis
- Department of Chemistry, University of California, Riverside, Riverside, CA, 92521, USA.,Center for Nanoscale Science and Engineering, University of California, Riverside, Riverside, CA, 92521, USA.,Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA, 92521, USA
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22
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Molčanov K, Milašinović V, Ivić N, Stilinović V, Kolarić D, Kojić-Prodić B. Influence of organic cations on the stacking of semiquinone radical anions. CrystEngComm 2019. [DOI: 10.1039/c9ce00919a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of salts of tetrachloro- and tetrabromosemiquinone radical anions reveal four types of stacks: 1) pancake bonded dimers, 2) pancake-bonded trimers, 3) equidistant radicals and 4) a novel type of equidistant stacks of partially charged radicals.
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Affiliation(s)
| | | | - Nives Ivić
- Ruđer Bošković Institute
- Zagreb HR-10000
- Croatia
| | - Vladimir Stilinović
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- Zagreb HR-10000
- Croatia
| | - Dinko Kolarić
- Special Hospital for Medical Rehabilitation
- Daruvarske Toplice
- Daruvar HR-43500
- Croatia
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23
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Chen XR, Liu SX, Ren Q, Tian ZF, Huang XC, Wang L, Ren XM. Wide Magnetic Thermal Memory Effect (∼55 K) Above Room Temperature Coupled to a Structure Phase Transition of Lattice Symmetry Reduction in High-Temperature Phase in an S = 1/2 Spin Chain Molecule Crystal. J Phys Chem B 2018; 122:12428-12435. [PMID: 30514086 DOI: 10.1021/acs.jpcb.8b10492] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
One-dimensional (1D) S = 1/2 Heisenberg antiferromagnetic (AFM) chain system shows frequently a spin-Peierls-type transition owing to strong spin-lattice coupling. From high-temperature phase (HTP) to low-temperature phase (LTP), the spin chain distortion leads to the reduction in lattice symmetry in LTP, called the symmetry breaking (SB) phase transition. Herein, we report the first example of 1D S = 1/2 AFM molecular crystal, [Et3( n-Pr)N][Ni(dmit)2] (Et3( n-Pr)N+ = triethylpropylammonium, dmit2- = 2-thioxo-1,3-dithiole-4,5-dithiolate), which shows a structural phase transition with lattice symmetry increase in LTP, which is contrary to the SB phase transition. Particularly, the structure phase transition leads to magnetically bistable state with TC↑ ≈ 375 K, TC↓ ≈ 320 K, and surprisingly large thermal hysteresis (∼55 K). Additionally, LTP and HTP coexist in a temperature region near TC but not at TC in this 1D spin system. The large hysteresis is related to the huge deformation of anion stack, which needs high activation energy for the structure transformation and magnetic transition between LTP and HTP. This study would not only provide new insight into the relationship of spin-Peierls-type transition and structure phase transition but also offer a roadmap for searching molecular-scale magnetic bistable materials, which are in huge demand in future electronic, magnetic, and photonic technologies.
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Affiliation(s)
- Xuan-Rong Chen
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry & Molecular Engineering , Nanjing Tech University , Nanjing 210009 , P. R. China.,School of Chemistry & Environmental Engineering and Instrumental Analysis Center , Yancheng Teachers University , Yancheng 224051 , P. R. China
| | - Shao-Xian Liu
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry & Molecular Engineering , Nanjing Tech University , Nanjing 210009 , P. R. China
| | - Qiu Ren
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry & Molecular Engineering , Nanjing Tech University , Nanjing 210009 , P. R. China
| | - Zheng-Fang Tian
- Hubei Key Laboratory for Processing and Application of Catalytic Materials , Huanggang Normal University , Huanggang 438000 , P. R. China
| | | | - Lifeng Wang
- School of Chemistry & Environmental Engineering and Instrumental Analysis Center , Yancheng Teachers University , Yancheng 224051 , P. R. China.,Institute for Frontier Materials (IFM) , Deakin University , 75 Pigdons Road, Waurn Ponds , Victoria 3216 , Australia
| | - Xiao-Ming Ren
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry & Molecular Engineering , Nanjing Tech University , Nanjing 210009 , P. R. China
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24
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Rakitin OA, Zibarev AV. Synthesis and Applications of 5‐Membered Chalcogen‐Nitrogen π‐Heterocycles with Three Heteroatoms. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800536] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Oleg A. Rakitin
- N. D. Zelinsky Institute of Organic ChemistryRussian Academy of Sciences 119991 Moscow Russia
- Nanotechnology Education and Research CenterSouth Ural State University 454080 Chelyabinsk Russia
| | - Andrey V. Zibarev
- N. N. Vorozhtsov Institute of Organic ChemistrySiberian Branch of Russian Academy of Sciences 630090 Novosibirsk Russia
- Department of ChemistryNational Research University – Tomsk State University 634050 Tomsk Russia
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25
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Greer SM, Oakley RT, van Tol J, Shatruk M, Hill S. Investigating the thermally- and light-induced interconversion of bisdithiazolyl radicals and dimers with high-field EPR. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.06.047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Dynamic molecular crystals with switchable physical properties. Nat Chem 2018; 8:644-56. [PMID: 27325090 DOI: 10.1038/nchem.2547] [Citation(s) in RCA: 509] [Impact Index Per Article: 84.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Accepted: 05/09/2016] [Indexed: 02/07/2023]
Abstract
The development of molecular materials whose physical properties can be controlled by external stimuli - such as light, electric field, temperature, and pressure - has recently attracted much attention owing to their potential applications in molecular devices. There are a number of ways to alter the physical properties of crystalline materials. These include the modulation of the spin and redox states of the crystal's components, or the incorporation within the crystalline lattice of tunable molecules that exhibit stimuli-induced changes in their molecular structure. A switching behaviour can also be induced by changing the molecular orientation of the crystal's components, even in cases where the overall molecular structure is not affected. Controlling intermolecular interactions within a molecular material is also an effective tool to modulate its physical properties. This Review discusses recent advances in the development of such stimuli-responsive, switchable crystalline compounds - referred to here as dynamic molecular crystals - and suggests how different approaches can serve to prepare functional materials.
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27
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Selvakumar K, Singh HB. Adaptive responses of sterically confined intramolecular chalcogen bonds. Chem Sci 2018; 9:7027-7042. [PMID: 30310623 PMCID: PMC6137456 DOI: 10.1039/c8sc01943f] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2018] [Accepted: 07/24/2018] [Indexed: 12/20/2022] Open
Abstract
The existence of intramolecular chalcogen bonds (IChBs) in 2,6-disubstituted arylchalcogen derivatives is determined by the substituents and the sigma hole donor behavior of the chalcogen atom in the molecule.
The responsive behavior of an entity towards its immediate surrounding is referred to as an adaptive response. The adaptive responses of a noncovalent interaction at the molecular scale are reflected from its structural and functional roles. Intramolecular chalcogen bonding (IChB), an attractive interaction between a heavy chalcogen E (E = Se or Te) centered sigma hole and an ortho-heteroatom Lewis base donor D (D = O or N), plays an adaptive role in defining the structure and reactivity of arylchalcogen compounds. In this perspective, we describe the adaptive roles of a chalcogen centered Lewis acid sigma hole and a proximal Lewis base (O or N) in accommodating built-in steric stress in 2,6-disubstituted arylchalcogen compounds. From our perspective, the IChB components (a sigma hole and the proximal Lewis base) act in synergism to accommodate the overwhelming steric force. The adaptive responses of the IChB components are inferred from the observed molecular structures and reactivity. These include (a) adaptation of a conformation without IChBs, (b) adaptation of a conformation with weak IChBs, (c) twisting the skeletal aryl ring while maintaining IChBs, (d) ionization of the E–X bond (e.g., X = Br) to relieve stress and (e) intramolecular cyclization to relieve steric stress. A comprehensive approach, involving X-ray data analysis, density functional theory (DFT) calculations, reaction pattern analysis and principal component analysis (PCA), has been employed to rationalize the adaptive behaviors of IChBs in arylchalcogen compounds. We believe that the perception of ChB as an adaptive/stimulus responsive interaction would profit the futuristic approaches that would utilise ChB as self-assembly and molecular recognition tools.
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Affiliation(s)
| | - Harkesh B Singh
- Department of Chemistry , Indian Institute of Technology Bombay , Powai-400076 , Mumbai , Maharashtra , India .
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28
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Molčanov K, Mou Z, Kertesz M, Kojić-Prodić B, Stalke D, Demeshko S, Šantić A, Stilinović V. Pancake Bonding in π-Stacked Trimers in a Salt of Tetrachloroquinone Anion. Chemistry 2018; 24:8292-8297. [PMID: 29624761 DOI: 10.1002/chem.201800672] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Indexed: 11/07/2022]
Abstract
The crystal structure of [4-damp])2 [Cl4 Q]3 (4-damp=4-dimethylamino-N-methylpyridinium, Cl4 Q=tetrachloroquinone) salt is built up from slipped columnar stacks of quinoid rings composed of closely bound trimers with the intra-trimer separation distance of 2.84 Å and total charge of -2 whereas the inter-trimer distance is 3.59 Å. The individual rings exhibit partial negative charges that are distributed unevenly among the three Cl4 Qs in the trimer. The strong interactions within a trimer (Cl4 Q)32- have a partially covalent character with two-electron/multicentered bonding, that is extended over three rings, plausibly termed as "pancake bonding". The electron pairing within this multicentre bond leads to the fact that the crystals are diamagnetic and act as insulators. The studies of the structure and nature of bonding are based on X-ray charge density analysis and density functional theory.
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Affiliation(s)
| | - Zhongyu Mou
- Department of Chemistry and Institute of Soft Matter, Georgetown University, 424 Regents Hall, Washington, DC, 20057-1227, USA
| | - Miklos Kertesz
- Department of Chemistry and Institute of Soft Matter, Georgetown University, 424 Regents Hall, Washington, DC, 20057-1227, USA
| | | | - Dietmar Stalke
- Institut für Anorgansiche Chemie, Universität Göttingen, Tammanstraße 4, 37077, Göttingen, Germany
| | - Serhiy Demeshko
- Institut für Anorgansiche Chemie, Universität Göttingen, Tammanstraße 4, 37077, Göttingen, Germany
| | - Ana Šantić
- Rudjer Bošković Institute, Bijenička 54, 10000, Zagreb, Croatia
| | - Vladimir Stilinović
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000, Zagreb, Croatia
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29
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Tan G, Wang X. Isolable Radical Ions of Main-Group Elements: Structures, Bonding and Properties. CHINESE J CHEM 2018. [DOI: 10.1002/cjoc.201700802] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Gengwen Tan
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures; Nanjing University; Nanjing Jiangsu 210023 China
| | - Xinping Wang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures; Nanjing University; Nanjing Jiangsu 210023 China
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30
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Makarov AY, Bagryanskaya IY, Volkova YM, Shakirov MM, Zibarev AV. Salts of Sterically Hindered Chalcogen-Varied Herz Cations Including Those with [Te3
Cl14
]2-
and [Te4
Cl18
]2-
Anions. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201701470] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Alexander Yu. Makarov
- Institute of Organic Chemistry; Russian Academy of Sciences; 630090 Novosibirsk Russia
| | - Irina Yu. Bagryanskaya
- Institute of Organic Chemistry; Russian Academy of Sciences; 630090 Novosibirsk Russia
- Department of Natural Sciences; Novosibirsk State University; 630090 Novosibirsk Russia
| | - Yulia M. Volkova
- Institute of Organic Chemistry; Russian Academy of Sciences; 630090 Novosibirsk Russia
| | - Makhmut M. Shakirov
- Institute of Organic Chemistry; Russian Academy of Sciences; 630090 Novosibirsk Russia
| | - Andrey V. Zibarev
- Institute of Organic Chemistry; Russian Academy of Sciences; 630090 Novosibirsk Russia
- Department of Physics; Novosibirsk State University; 630090 Novosibirsk Russia
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31
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Molčanov K, Stalke D, Šantić A, Demeshko S, Stilinović V, Mou Z, Kertesz M, Kojić-Prodić B. Probing semiconductivity in crystals of stable semiquinone radicals: organic salts of 5,6-dichloro-2,3-dicyanosemiquinone (DDQ) radical anions. CrystEngComm 2018. [DOI: 10.1039/c7ce02146a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The structural parameters and semiconductivity of crystals with stacked 5,6-dichloro-2,3-dicyanosemiquinone (DDQ) radicals were studied for a series of nine salts of DDQ with substituted N-ethyl- and N-methylpyridinium cations.
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Affiliation(s)
| | - Dietmar Stalke
- Institut für Anorgansiche Chemie
- Universität Göttingen
- D-37077 Göttingen
- Germany
| | - Ana Šantić
- Ruđer Bošković Institute
- Zagreb HR-10000
- Croatia
| | - Serhiy Demeshko
- Institut für Anorgansiche Chemie
- Universität Göttingen
- D-37077 Göttingen
- Germany
| | - Vladimir Stilinović
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- Zagreb HR-10000
- Croatia
| | - Zhongyu Mou
- Department of Chemistry and Institute of Soft Matter
- Georgetown University
- USA
| | - Miklos Kertesz
- Department of Chemistry and Institute of Soft Matter
- Georgetown University
- USA
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32
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Francese T, Ribas-Arino J, Novoa JJ, Havenith RW, Broer R, de Graaf C, Deumal M. The magnetic fingerprint of dithiazolyl-based molecule magnets. Phys Chem Chem Phys 2018; 20:20406-20416. [DOI: 10.1039/c8cp03173h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ferromagnetic fingerprint of dithiazolyl-based molecule materials is uncovered. Interestingly geometrical rather than electronic structure factors play the leading role.
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Affiliation(s)
- Tommaso Francese
- Dept. Ciència de Materials i Química Física
- Secció Química Física & IQTCUB
- Universitat de Barcelona
- Barcelona
- Spain
| | - Jordi Ribas-Arino
- Dept. Ciència de Materials i Química Física
- Secció Química Física & IQTCUB
- Universitat de Barcelona
- Barcelona
- Spain
| | - Juan J. Novoa
- Dept. Ciència de Materials i Química Física
- Secció Química Física & IQTCUB
- Universitat de Barcelona
- Barcelona
- Spain
| | - Remco W.A. Havenith
- Theoretical Chemistry
- Zernike Institute for Advance Materials
- University of Groningen
- 9747 AG Groningen
- The Netherlands
| | - Ria Broer
- Theoretical Chemistry
- Zernike Institute for Advance Materials
- University of Groningen
- 9747 AG Groningen
- The Netherlands
| | - Coen de Graaf
- Theoretical Chemistry
- Zernike Institute for Advance Materials
- University of Groningen
- 9747 AG Groningen
- The Netherlands
| | - Mercè Deumal
- Dept. Ciència de Materials i Química Física
- Secció Química Física & IQTCUB
- Universitat de Barcelona
- Barcelona
- Spain
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33
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Tan G, Wang X. Isolable Bis(triarylamine) Dications: Analogues of Thiele's, Chichibabin's, and Müller's Hydrocarbons. Acc Chem Res 2017; 50:1997-2006. [PMID: 28731693 DOI: 10.1021/acs.accounts.7b00229] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Since the pioneering work by Thiele and Chichibabin, who synthesized the first diradicals bridged by phenylene and biphenylene groups in 1904 and 1907, respectively, numerous efforts have been devoted to synthesizing stable diradicals during the last few decades, and several strategies have been developed to stabilize these highly reactive diradicals. In this Account, we describe the synthesis and characterization of isolable bis(triarylamine) dications, nitrogen analogues of Thiele's, Chichibabin's, and Müller's hydrocarbons, which represent facilely accessible, stable diradicals by replacing carbinyl centers with isoelectronic aminium centers. Along with discussing the molecular structures and electronic structures of the isolated bis(triarylamine) dications, their spectroscopic and magnetic properties are also introduced. Since 2011, we have reported the stabilization of a variety of radical cations bearing the weakly coordinating anion Al(ORF)4- (RF = polyfluorinated alkyl group), which we have recently successfully applied for the stabilization and crystallization of bis(triarylamine) dications, analogues of Thiele's, Chichibabin's, and Müller's hydrocarbons. Prior to our and Kamada's work, there have been only three stable bis(triarylamine) dications isolated in the solid state. The facile access of bis(triarylamine) dications in their crystalline forms allowed us to pursue a deep investigation of their solid-state structures, electronic structures, and physical properties. Similar to their hydrocarbon analogues, bis(triarylamine) dications possess characteristic resonance structures between open-shell singlet (OS) diradicals and closed-shell (CS) quinoidal forms. The combination of single-crystal X-ray diffraction (XRD) analysis and density functional theory (DFT) calculations has proved to be a robust strategy to gain a better understanding of the electronic structures of the obtained diradicals. The structural parameters obtained from XRD analysis reflect the overall contribution of each resonance structure to the crystal structure. The comparison of the parameters from the crystal structures with those from DFT calculations for the pure electronic configurations (CS, OS, and triplet states) affords an overview of the ground-state structures of the diradicals. To justify the "degree" of singlet diradical character, the diradical parameter y is applied, which is estimated by the occupancy of the lowest unoccupied natural orbital (LUNO) having antibonding nature (y = 0 for the closed-shell and y = 1 for the pure singlet diradical). In addition, magnetic susceptibility measurements serve as a practical experimental method to determine the singlet-triplet energy gaps of the isolable diradical dications. Through detailed studies on isolable bis(triarylamine) dications, magnetic bistability caused by intramolecular electron-exchange interactions was observed. Moreover, we also found that the singlet-triplet energy gaps of the diradicals could be thermally controlled. These investigations highlight the potential of bis(triarylamine) dications as building blocks for functional materials.
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Affiliation(s)
- Gengwen Tan
- State Key Laboratory of Coordination Chemistry,
School of Chemistry and Chemical Engineering, Collaborative Innovation
Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China
| | - Xinping Wang
- State Key Laboratory of Coordination Chemistry,
School of Chemistry and Chemical Engineering, Collaborative Innovation
Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China
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34
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35
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Fumanal M, Novoa JJ, Ribas-Arino J. Origin of Bistability in the Butyl-Substituted Spirobiphenalenyl-Based Neutral Radical Material. Chemistry 2017; 23:7772-7784. [DOI: 10.1002/chem.201700946] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Indexed: 01/24/2023]
Affiliation(s)
- Maria Fumanal
- Departament de Química Física and IQTCUB; Facultat de Química; Universitat de Barcelona; Av. Diagonal 645 08028 Barcelona Spain
- Current address: Laboratoire de Chimie Quantique; Institut de Chimie UMR7177; CNRS-Université de Strasbourg; 1 Rue Blaise Pascal BP 296/R8 67007 Strasbourg France
| | - Juan J. Novoa
- Departament de Química Física and IQTCUB; Facultat de Química; Universitat de Barcelona; Av. Diagonal 645 08028 Barcelona Spain
| | - Jordi Ribas-Arino
- Departament de Química Física and IQTCUB; Facultat de Química; Universitat de Barcelona; Av. Diagonal 645 08028 Barcelona Spain
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36
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Vela S, Reardon MB, Jakobsche CE, Turnbull MM, Ribas-Arino J, Novoa JJ. Bistability in Organic Magnetic Materials: A Comparative Study of the Key Differences between Hysteretic and Non-hysteretic Spin Transitions in Dithiazolyl Radicals. Chemistry 2017; 23:3479-3489. [DOI: 10.1002/chem.201700021] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Sergi Vela
- Departament de Ciència de Materials i Química Física; Universitat de Barcelona and IQTCUB; Av. Diagonal 645 08028 Barcelona Spain), E-mail
- Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177; CNRS-Université de Strasbourg; 1 Rue Blaise Pascal 67000 Strasbourg France
| | - Michael B. Reardon
- Carlson School of Chemistry & Biochemistry; Clark University; 950 Main Street Worcester MA 01610 USA
| | - Charles E. Jakobsche
- Carlson School of Chemistry & Biochemistry; Clark University; 950 Main Street Worcester MA 01610 USA
| | - Mark M. Turnbull
- Carlson School of Chemistry & Biochemistry; Clark University; 950 Main Street Worcester MA 01610 USA
| | - Jordi Ribas-Arino
- Departament de Ciència de Materials i Química Física; Universitat de Barcelona and IQTCUB; Av. Diagonal 645 08028 Barcelona Spain), E-mail
| | - Juan J. Novoa
- Departament de Ciència de Materials i Química Física; Universitat de Barcelona and IQTCUB; Av. Diagonal 645 08028 Barcelona Spain), E-mail
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37
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Molčanov K, Kojić-Prodić B. Spin pairing, electrostatic and dipolar interactions influence stacking of radical anions in alkali salts of 4,5-dichloro-3,6-dioxocyclohexa-1,4-diene-1,2-dicarbonitrile (DDQ). CrystEngComm 2017. [DOI: 10.1039/c7ce00261k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Li T, Tan G, Shao D, Li J, Zhang Z, Song Y, Sui Y, Chen S, Fang Y, Wang X. Magnetic Bistability in a Discrete Organic Radical. J Am Chem Soc 2016; 138:10092-5. [DOI: 10.1021/jacs.6b05863] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | | | - Zaichao Zhang
- School
of Chemistry and Chemical Engineering, Huaiyin Normal University, Huai’an 223300, China
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39
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Wang J, Li JN, Zhang SL, Zhao XH, Shao D, Wang XY. Syntheses and magnetic properties of a pyrimidyl-substituted nitronyl nitroxide radical and its cobalt(ii) complexes. Chem Commun (Camb) 2016; 52:5033-6. [DOI: 10.1039/c6cc00915h] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new bis-bidentate pyrimidyl-substituted nitronyl nitroxide radical and two cobalt(ii) complexes of this ligand were synthesized and characterized.
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Affiliation(s)
- Jian Wang
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
| | - Jia-Nan Li
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
| | - Shao-Liang Zhang
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
| | - Xin-Hua Zhao
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
| | - Dong Shao
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
| | - Xin-Yi Wang
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
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40
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Vela S, Deumal M, Shiga M, Novoa JJ, Ribas-Arino J. Dynamical effects on the magnetic properties of dithiazolyl bistable materials. Chem Sci 2015; 6:2371-2381. [PMID: 29308151 PMCID: PMC5645919 DOI: 10.1039/c4sc03930k] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 01/22/2015] [Indexed: 12/13/2022] Open
Abstract
The magnetic properties of molecule-based magnets are commonly rationalized by considering only a single nuclear configuration of the system under study (usually an X-ray crystal structure). Here, by means of a computational study, we compare the results obtained using such a static approach with those obtained by explicitly accounting for thermal fluctuations, and uncover the serious limitations of the static perspective when dealing with magnetic crystals whose radicals undergo wide-amplitude motions. As a proof of concept, these limitations are illustrated for the magnetically bistable 1,3,5-trithia-2,4,6-triazapentalenyl (TTTA) material. For its high-temperature phase at 300 K, we show that nuclear dynamics induce large fluctuations in the magnetic exchange interactions (JAB) between spins (up to 1000% of the average value). These deviations result in a ∼20% difference between the 300 K magnetic susceptibility computed by explicitly considering the nuclear dynamics and that computed using the X-ray structure, the former being in better agreement with the experimental data. The unveiled strong coupling between JAB interactions and intermolecular vibrations reveals that considering JAB as a constant value at a given temperature (as always done in molecular magnetism) leads to a flawed description of the magnetism of TTTA. Instead, the physically relevant concept in this case is the statistical distribution of JAB values. The discovery that a single X-ray structure is not adequate enough to interpret the magnetic properties of TTTA is also expected to be decisive in other organic magnets with dominant exchange interactions propagating through labile π-π networks.
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Affiliation(s)
- Sergi Vela
- Departament de Química Física and IQTCUB , Facultat de Química , Universitat de Barcelona , Av. Diagonal 645 , 08028-Barcelona , Spain . ;
| | - Mercè Deumal
- Departament de Química Física and IQTCUB , Facultat de Química , Universitat de Barcelona , Av. Diagonal 645 , 08028-Barcelona , Spain . ;
| | - Motoyuki Shiga
- Center for Computational Science and E-Systems , Japan Atomic Energy Agency , 148-4, Kashiwanoha Campus, 178-4 Wakashiba, Kashiwa , Chiba , 277-0871 , Japan
| | - Juan J Novoa
- Departament de Química Física and IQTCUB , Facultat de Química , Universitat de Barcelona , Av. Diagonal 645 , 08028-Barcelona , Spain . ;
| | - Jordi Ribas-Arino
- Departament de Química Física and IQTCUB , Facultat de Química , Universitat de Barcelona , Av. Diagonal 645 , 08028-Barcelona , Spain . ;
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41
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Fujita W. Ferromagnetic ordering in the organic radical cation salt BBDTA·Au(CN)2at 8.2 K. Dalton Trans 2015; 44:903-7. [DOI: 10.1039/c4dt03208j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An organic radical cation salt, BBDTA·Au(CN)2, with a slipped π-stacking columnar structure and intercolumnar short contacts, shows ferromagnetic ordering at 8.2 K, the highest reported temperature among the BBDTA+cation salts.
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Affiliation(s)
- Wataru Fujita
- Department of Information and Biological Sciences
- Graduate School of Natural Sciences
- Nagoya City University
- Nagoya 467-8501
- Japan
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42
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Vela S, Novoa JJ, Ribas-Arino J. Insights into the crystal-packing effects on the spin crossover of [FeII(1-bpp)]2+-based materials. Phys Chem Chem Phys 2014; 16:27012-24. [DOI: 10.1039/c4cp03971h] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Fumanal M, Vela S, Ribas-Ariño J, Novoa JJ. On the Importance of Thermal Effects and Crystalline Disorder in the Magnetism of Benzotriazinyl-Derived Organic Radicals. Chem Asian J 2014; 9:3612-22. [DOI: 10.1002/asia.201402871] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Revised: 08/25/2014] [Indexed: 11/10/2022]
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44
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The key role of vibrational entropy in the phase transitions of dithiazolyl-based bistable magnetic materials. Nat Commun 2014; 5:4411. [DOI: 10.1038/ncomms5411] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Accepted: 06/16/2014] [Indexed: 11/08/2022] Open
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45
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Lekin K, Phan H, Winter SM, Wong JWL, Leitch AA, Laniel D, Yong W, Secco RA, Tse JS, Desgreniers S, Dube PA, Shatruk M, Oakley RT. Heat, Pressure and Light-Induced Interconversion of Bisdithiazolyl Radicals and Dimers. J Am Chem Soc 2014; 136:8050-62. [DOI: 10.1021/ja502753t] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Kristina Lekin
- Department
of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Hoa Phan
- Department
of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Stephen M. Winter
- Department
of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Joanne W. L. Wong
- Department
of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Alicea A. Leitch
- Department
of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Dominique Laniel
- Department
of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Wenjun Yong
- Department
of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Richard A. Secco
- Department
of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - John S. Tse
- Department
of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Serge Desgreniers
- Department
of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Paul A. Dube
- Brockhouse
Institute for Materials Research, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - Michael Shatruk
- Department
of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Richard T. Oakley
- Department
of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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46
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Vela S, Sopena A, Ribas-Arino J, Novoa JJ, Deumal M. Elucidating the 2D Magnetic Topology of the ‘Metal-Radical’ TTTA⋅Cu(hfac)2System. Chemistry 2014; 20:7083-90. [DOI: 10.1002/chem.201304712] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Indexed: 11/08/2022]
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47
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Konstantinova LS, Rakitin OA. Sulfur monochloride in organic synthesis. RUSSIAN CHEMICAL REVIEWS 2014. [DOI: 10.1070/rc2014v083n03abeh004354] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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48
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Awaga K, Nomura K, Kishida H, Fujita W, Yoshikawa H, Matsushita MM, Hu L, Shuku Y, Suizu R. Electron-Transfer Processes in Highly-Correlated Electron Systems of Thiazyl Radicals. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2014. [DOI: 10.1246/bcsj.20130248] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Kunio Awaga
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
- CREST, Nagoya University
| | - Kenji Nomura
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
| | - Hideo Kishida
- Department of Applied Physics, Graduate School of Engineering, Nagoya University
| | - Wataru Fujita
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
| | - Hirofumi Yoshikawa
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
| | - Michio M. Matsushita
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
| | - Laigui Hu
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
| | - Yoshiaki Shuku
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
| | - Rie Suizu
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
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49
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Jalilov AS, Han L, Nelsen SF, Guzei IA. Oxidation Products of Doubly Trimethylene-Bridged Tetrabenzyl p-Phenylenediamine Paracyclophane. J Org Chem 2013; 78:11373-81. [DOI: 10.1021/jo401921f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Almaz S. Jalilov
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53711-1396, United States
| | - Lu Han
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53711-1396, United States
| | - Stephen F. Nelsen
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53711-1396, United States
| | - Ilia A. Guzei
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53711-1396, United States
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50
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Zhao XH, Huang XC, Zhang SL, Shao D, Wei HY, Wang XY. Cation-Dependent Magnetic Ordering and Room-Temperature Bistability in Azido-Bridged Perovskite-Type Compounds. J Am Chem Soc 2013; 135:16006-9. [DOI: 10.1021/ja407654n] [Citation(s) in RCA: 139] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xin-Hua Zhao
- State
Key Laboratory of Coordination Chemistry, School of Chemistry and
Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Xing-Cai Huang
- State
Key Laboratory of Coordination Chemistry, School of Chemistry and
Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Shao-Liang Zhang
- State
Key Laboratory of Coordination Chemistry, School of Chemistry and
Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Dong Shao
- State
Key Laboratory of Coordination Chemistry, School of Chemistry and
Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Hai-Yan Wei
- Jiangsu
Key Laboratory of Biofunctional Materials, School of Chemistry and
Materials Science, Nanjing Normal University, Nanjing, 210097, China
| | - Xin-Yi Wang
- State
Key Laboratory of Coordination Chemistry, School of Chemistry and
Chemical Engineering, Nanjing University, Nanjing, 210093, China
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