1
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Luo Y, Zhou RH, Shao Z, Liu D, Lu HH, Shang MJ, Zhao L, Liu T, Meng YS. Effects of mono- or di-fluoro-substitution on spin crossover behavior in a pair of Schiff base-like Fe II-coordination polymers. Dalton Trans 2024; 53:14692-14700. [PMID: 39157994 DOI: 10.1039/d4dt01103a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/20/2024]
Abstract
Spin crossover (SCO) has long been a hot topic in the field of molecular magnetism owing to its unique bistability character. Rational control of thermal hysteresis and transition temperature (T1/2) is crucial for their practical applications, which rely on precise manipulation of the substituents of SCO coordinating ligands and molecular packing interactions. In this study, we designed two different bridging ligands (2-FDPB: 4,4'-(2-fluoro-1,4-phenylene)dipyridine; 2,3-FDPB: 4,4'-(2,3-difluoro-1,4-phenylene)dipyridine) featuring one and two fluoro substitution on the central benzene ring and applied a Schiff base-like equatorial tetradentate ligand {diethyl(E,E)-2,2'-[4,5-difluoro-1,2-phenyl-bis(iminomethylidyne)]bis(3-oxobutanoate)-(2-)-N,N',O3,O3'} (H2L) to coordinate with the FeII ion. Two FeII-coordination chain polymers [FeII(L)(2,3-FDPB)]·0.25CH2Cl2 (1) and [FeII(L)(2-FDPB)]·0.5CH3OH (2) were obtained. 1 crystallizes in the monoclinic P21/n space group with only one FeII center, while 2 crystallizes in the triclinic P1̄ space group with two independent FeII centers. Unlike the identical 2D layer stacking in 1, 2 exhibited alternating stacking of the extending 2D layers and meshed chains. Magnetic measurements revealed the typical thermally induced spin crossover behavior (SCO): 1 exhibited a 41 K-wide thermal hysteresis with transition temperatures of T1/2↑ = 245 K and T1/2↓ = 204 K, while 2 showed a higher transition temperature (T1/2 = 330 K) with no thermal hysteresis. Magneto-structural correlation studies suggest that the electron-withdrawing effect present in the fluoro substituents does not have a significant impact on the SCO behaviors. Despite the fluoro substituents having a similar atomic radius of hydrogen atoms, variations in the number of these substituents can alter the crystallization behavior of these complexes, which in turn affects the solvents, molecular stacking patterns, and intermolecular interactions, ultimately influencing the SCO behaviors.
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Affiliation(s)
- Yu Luo
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Ren-He Zhou
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Zhen Shao
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Dan Liu
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Han-Han Lu
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Meng-Jia Shang
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Liang Zhao
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Tao Liu
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Yin-Shan Meng
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
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2
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Wu ML, Chen YC, Ruan ZY, Ni ZP, Wu SG, Tong ML. Two-dimensional spin-crossover coordination polymers based on the 1,1,2,2-tetra(pyridin-4-yl)ethene ligand. Dalton Trans 2024; 53:7470-7476. [PMID: 38595157 DOI: 10.1039/d4dt00204k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
A series of two-dimensional (2D) spin-crossover coordination polymers (SCO-CPs) [FeII(TPE)(NCX)2]·solv (1: X = BH3, solv = H2O·2CH3OH·DMF; 2: X = Se, solv = H2O·2CH3OH·0.5DMF; 3: X = S, solv = H2O·2CH3OH·0.5DMF) were synthesized by employing 1,1,2,2-tetra(pyridin-4-yl)ethene (TPE) and pseudohalide (NCX-) coligands. Magnetic measurements indicated that complexes 1-3 exhibited SCO behaviors with diminishing thermal hysteresis (7/4/0 K) upon decreasing the ligand-field strength. The critical temperatures (Tc) during spin transition were found to be inversely proportional to the coordination ability parameters (a™) with a linear correlation. The guest effect was also investigated in the solvent-exchanged phases 1-SE/2-SE/3-SE wherein the DMF molecules were replaced by methanol molecules. Compared with 1-3, 1-SE/2-SE/3-SE displayed more abrupt and complete single-step SCO behaviors but narrower thermal hysteretic loops. The results reported here demonstrate that the Tc values of these two families were dominated by the ligand-field strength of the NCX- anions (NCBH3 > NCSe > NCS), whereas the guest effect only modulated the kinetic factor of the SCO nature in this system.
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Affiliation(s)
- Meng-Ling Wu
- Key Laboratory of Bioinorganic and Synthetic Chemistry, Ministry of Education, School of Chemistry, IGCME, GBRCE for Functional Molecular Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
| | - Yan-Cong Chen
- Key Laboratory of Bioinorganic and Synthetic Chemistry, Ministry of Education, School of Chemistry, IGCME, GBRCE for Functional Molecular Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
| | - Ze-Yu Ruan
- Key Laboratory of Bioinorganic and Synthetic Chemistry, Ministry of Education, School of Chemistry, IGCME, GBRCE for Functional Molecular Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
| | - Zhao-Ping Ni
- Key Laboratory of Bioinorganic and Synthetic Chemistry, Ministry of Education, School of Chemistry, IGCME, GBRCE for Functional Molecular Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
| | - Si-Guo Wu
- Key Laboratory of Bioinorganic and Synthetic Chemistry, Ministry of Education, School of Chemistry, IGCME, GBRCE for Functional Molecular Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
| | - Ming-Liang Tong
- Key Laboratory of Bioinorganic and Synthetic Chemistry, Ministry of Education, School of Chemistry, IGCME, GBRCE for Functional Molecular Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
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3
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Tołoczko A, Kaźmierczak M, Książek M, Weselski M, Siczek M, Kusz J, Bronisz R. Expanding the dimensionality of bis(tetrazolyl)alkane-based Fe(II) coordination polymers by the application of dinitrile coligands. Dalton Trans 2024; 53:7163-7174. [PMID: 38573306 DOI: 10.1039/d4dt00462k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2024]
Abstract
Reactions between 1,2-di(tetrazol-2-yl)ethane (ebtz), 1,6-di(tetrazol-2-yl)hexane (hbtz) or 1,1'-di(tetrazol-1-yl)methane (1ditz) and Fe(BF4)2 in the presence of adiponitrile (ADN), glutaronitrile (GLN) or suberonitrile (SUN) resulted in the formation of coordination polymers [Fe(μ-ebtz)2(μ-ADN)](BF4)2 (1), [Fe(μ-hbtz)2(μ-ADN)](BF4)2 (2), [Fe(μ-1ditz)2(GLN)2](BF4)2·GLN (3) and [Fe(μ-1ditz)2(μ-SUN)](BF4)2·SUN (4). It was established that the application of dinitriles allows an increase in the dimensionality of the ebtz and hbtz based systems while maintaining the structure of the polymeric units characteristic of previously studied mononitrile based analogues. In 3 and 4, regardless of the type of dinitrile coligand, the motif of 2D polymeric layers constituted by 1ditz molecules remains preserved. However, the dimensionality of 1ditz based networks is governed by the coordination modes of dinitriles. 3, based on a shorter molecule of glutaronitrile, crystallizes as a two-dimensional (2D) coordination polymer. In this compound, dinitriles coordinate monodentately or play the role of guest molecules. The substitution of glutaronitrile with suberonitrile enables the bridging of neighboring polymeric layers, resulting in a 3D network. The intentional selection of bis(tetrazoles) and dinitriles as building blocks has led, as expected, to obtaining systems with the structure of the first coordination sphere consisting of four tetrazole rings and two axially coordinated nitrile molecules. It created the conditions required for the occurrence of thermally induced spin crossover. Magnetic measurements and single crystal X-ray diffraction studies were used for the characterization of the spin crossover properties of 1-4.
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Affiliation(s)
- Aleksandra Tołoczko
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
| | - Marcin Kaźmierczak
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
| | - Maria Książek
- Institute of Physics, University of Silesia, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
| | - Marek Weselski
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
| | - Miłosz Siczek
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
| | - Joachim Kusz
- Institute of Physics, University of Silesia, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
| | - Robert Bronisz
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
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4
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Wang J, Li Y, Wei RJ, Tang Z, Yao ZS, Tao J. Spin-Crossover Behaviors of Iron(II) Complexes Bearing Halogen Ligands in Solid State and Solution. Inorg Chem 2023; 62:1354-1361. [PMID: 36635894 DOI: 10.1021/acs.inorgchem.2c02815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Numerous Fe(II) spin-crossover (SCO) compounds have been developed in the past decades, while the reports on the SCO materials with halogen atoms acting as coordinating ligands remain rare. In this study, we synthesize three iron(II) halide complexes with a general formula of [FeII(Py5Me2)X]+ (Py5Me2 = 2,6-bis[1,1-bis(2-pyridyl)ethyl]pyridine, X = Cl- or Br-) that undergo complete SCO transitions at near room temperature. The SCO properties of these compounds are investigated in detail by magnetic measurements, variable-temperature single-crystal X-ray diffractions, and Mössbauer spectra analyses. Because of the good stability of the coordination structures and suitable ligand-field strength, these compounds show robust spin transitions in both solid state and solution.
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Affiliation(s)
- Ju Wang
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, People's Republic of China
| | - Yun Li
- Engineering Research Center for Nanomaterials, Henan University, Kaifeng 475004, People's Republic of China
| | - Rong-Jia Wei
- College of Chemistry and Materials Science and Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University, Guangzhou 510632, People's Republic of China
| | - Zheng Tang
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, People's Republic of China
| | - Zi-Shuo Yao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, People's Republic of China
| | - Jun Tao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, People's Republic of China
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5
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Dong YN, Liu ZK, Xue JP, Li Y, Sun K, Yao ZS, Tao J. Two-Dimensional Coordination Polymer Showing Spin-Crossover Behavior with a 64 K Wide Hysteresis Loop. Inorg Chem 2022; 61:20232-20236. [DOI: 10.1021/acs.inorgchem.2c03626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Ya-Nan Dong
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing102488, PR China
| | - Zhi-Kun Liu
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing102488, PR China
| | - Jin-Peng Xue
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing102488, PR China
| | - Yun Li
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing102488, PR China
| | - Ke Sun
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing102488, PR China
| | - Zi-Shuo Yao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing102488, PR China
| | - Jun Tao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing102488, PR China
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6
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Zhu HL, Lei YR, Meng YS, Liu T, Oshio H. A Cyanide-bridged FeII–MoV-based Coordination Polymer Showing Spin Crossover. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.110217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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7
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Bibik YS, Shova S, Rotaru A, Shylin SI, Fritsky IO, Lampeka RD, Gural'skiy IA. Cooperative Spin Crossover above Room Temperature in the Iron(II) Cyanoborohydride-Pyrazine Complex. Inorg Chem 2022; 61:14761-14769. [PMID: 36067517 DOI: 10.1021/acs.inorgchem.2c02177] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hysteretic spin crossover in coordination complexes of 3d-metal ions represents one of the most spectacular phenomena of molecular bistability. In this paper we describe a self-assembly of pyrazine (pz) and Fe(BH3CN)2 that afforded the new 2D coordination polymer [Fe(pz)2(BH3CN)2]∞. It undergoes an abrupt, hysteretic spin crossover (SCO) with a T1/2 of 338 K (heating) and 326 K (cooling) according to magnetic susceptibility measurements. Mössbauer spectroscopy revealed a complete transition between the low-spin (LS) and the high-spin (HS) states of the iron centers. This LS-to-HS transition induced an increase of the unit cell volume by 10.6%. Meanwhile, a modulation of multiple [C-Hδ+···Hδ--B] dihydrogen bonds stimulates a contraction in direction c (2.2%). The simplicity of the synthesis, mild temperatures of transition, a pronounced thermochromism, stability upon thermal cycling, a striking volume expansion upon SCO, and an easy processability to composite films make this new complex an attractive material for switchable components of diverse applications.
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Affiliation(s)
- Yurii S Bibik
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64 Volodymyrska St., 01601 Kyiv, Ukraine
| | - Sergiu Shova
- "Petru Poni" Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iaşi, Romania
| | - Aurelian Rotaru
- Faculty of Electrical Engineering and Computer Science & MANSiD Research Center, Ştefan cel Mare University, Universitatii St. 13, 720229 Suceava, Romania
| | - Sergii I Shylin
- Department of Chemistry - Ångström Laboratory, Uppsala University, Box 523, 75120 Uppsala, Sweden
| | - Igor O Fritsky
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64 Volodymyrska St., 01601 Kyiv, Ukraine
| | - Rostyslav D Lampeka
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64 Volodymyrska St., 01601 Kyiv, Ukraine
| | - Il'ya A Gural'skiy
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64 Volodymyrska St., 01601 Kyiv, Ukraine
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8
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Spin crossover of a dinuclear Fe(II) complex in the trans-isomeric structure. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Kanno T, Nakabayashi K, Imoto K, Ohkoshi S. Manganese‐Octacyanidoniobate‐Based Ferrimagnet Possessing Bridging Ligands with Disulfide Bonds. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100747] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Takefumi Kanno
- Department of Chemistry School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku, Tokyo 113-0033 Japan
| | - Koji Nakabayashi
- Department of Chemistry School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku, Tokyo 113-0033 Japan
| | - Kenta Imoto
- Department of Chemistry School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku, Tokyo 113-0033 Japan
| | - Shin‐ichi Ohkoshi
- Department of Chemistry School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku, Tokyo 113-0033 Japan
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10
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Wei WJ, Mu Y, Wei L, Hu JX, Wang GM. Two Photochromic Complexes Assembled by a Nonphotochromic Ligand: Photogenerated Radical Enhanced Room-Temperature Phosphorescence. Inorg Chem 2021; 60:108-114. [PMID: 33351630 DOI: 10.1021/acs.inorgchem.0c02463] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Stimulating tunable room-temperature phosphorescence (RTP) is still a challenge in photochromic systems, which is vital for multifunctional coordination materials. Herein, we synthesized two new photochromic chain complexes through self-assembly of the nonphotochromic 1,3,5-tris(4-pyridyl)benzene ligand, diphosphonate, and Ln(III) ions (1 for Ln(III) = Dy and 2 for Ln(III) = Gd). Both compounds showed fast photoresponses with the color turning from yellow to dark gray with a reversible decoloration by heating or storage in the dark. The electron transfer photochromic behavior with the generated stable radicals was further confirmed by the room-temperature UV-vis and electron paramagnetic resonance spectra. Furthermore, via tuning the generation and disappearance of stable radicals, reversible room-temperature fluorescence and phosphorescence for both compounds were switched by light irradiation and a thermal treatment, with an enhanced intensity for RTP and a decrease in fluorescence during the duration of Xe-lamp light irradiation. This work provides a new strategy that photogenerated radicals could promote and enhance RTP properties in functional materials.
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Affiliation(s)
- Wu-Ji Wei
- College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, Shandong 266071, People's Republic of China
| | - Ying Mu
- College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, Shandong 266071, People's Republic of China
| | - Li Wei
- College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, Shandong 266071, People's Republic of China
| | - Ji-Xiang Hu
- College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, Shandong 266071, People's Republic of China
| | - Guo-Ming Wang
- College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, Shandong 266071, People's Republic of China
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11
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Li Y, Kong QR, Guo Y, Tang Z. Thermal hysteresis induced by external pressure in a 3D Hofmann-type SCO-MOF. Dalton Trans 2021; 50:1384-1389. [DOI: 10.1039/d0dt03796f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Two 3D Hofmann-type compounds [FeII(dbdpe)MII(CN)4]·4H2O have been synthesized. The application of pressure on compound 1 shifted the transition temperature from 185 K to 298 K and led to a hysteresis loop of 13–25 K.
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Affiliation(s)
- Yue Li
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
- People's Republic of China
| | - Qing-Rong Kong
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
- People's Republic of China
| | - Ying Guo
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
- People's Republic of China
| | - Zheng Tang
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry and Chemical Engineering
- Liangxiang Campus
- Beijing Institute of Technology
- Beijing 102488
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12
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Hao X, Dou Y, Cao T, Qin L, Yang L, Liu H, Li D, Liu Q, Zhang D, Zhou Z. Tuning of crystallization method and ligand conformation to give a mononuclear compound or two-dimensional SCO coordination polymer based on a new semi-rigid V-shaped bis-pyridyl bis-amide ligand. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2020; 76:412-418. [PMID: 32367821 DOI: 10.1107/s2053229620004854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Accepted: 04/05/2020] [Indexed: 11/11/2022]
Abstract
With the new semi-rigid V-shaped bidentate pyridyl amide compound 5-methyl-N,N'-bis(pyridin-4-yl)benzene-1,3-dicarboxamide (L) as an auxiliary ligand and the FeII ion as the metal centre, one mononuclear complex, bis(methanol-κO)bis[5-methyl-N,N'-bis(pyridin-4-yl)benzene-1,3-dicarboxamide-κN]bis(thiocyanato-κN)iron(II), [Fe(SCN)2(C19H16N4O2)2(CH3OH)2] (1), and one two-dimensional coordination polymer, catena-poly[[[bis(thiocyanato-κN)iron(II)]-bis[μ-5-methyl-N,N'-bis(pyridin-4-yl)benzene-1,3-dicarboxamide-κ2N:N']] methanol disolvate dihydrate], {[Fe(SCN)2(C19H16N4O2)2]·2CH3OH·2H2O}n (2), were prepared by slow evaporation and H-tube diffusion methods, respectively, indicating the effect of the method of crystallization on the structure type of the target product. Both complexes have been structurally characterized by elemental analysis, IR spectroscopy and single-crystal X-ray crystallography. The single-crystal X-ray diffraction analysis shows that L functions as a monodentate ligand in mononuclear 1, while it coordinates in a bidentate manner to two independent Fe(SCN)2 units in complex 2, with a different conformation from that in 1 and the ligands point in two almost orthogonal directions, therefore leading to a two-dimensional grid-like network. Investigation of the magnetic properties reveals the always high-spin state of the FeII centre over the whole temperature range in 1 and a gradual thermally-induced incomplete spin crossover (SCO) behaviour below 150 K in 2, demonstrating the influence of the different coordination fields on the spin properties of the metal ions. The current results provide useful information for the rational design of functional complexes with different structure dimensionalities by employing different conformations of the ligand and different crystallization methods.
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Affiliation(s)
- Xiaoyun Hao
- College of Chemical and Chemical Engineering, Shandong University of Technology, Zibo 255049, People's Republic of China
| | - Yong Dou
- College of Chemical and Chemical Engineering, Shandong University of Technology, Zibo 255049, People's Republic of China
| | - Tong Cao
- College of Chemical and Chemical Engineering, Shandong University of Technology, Zibo 255049, People's Republic of China
| | - Lan Qin
- College of Chemical and Chemical Engineering, Shandong University of Technology, Zibo 255049, People's Republic of China
| | - Lu Yang
- College of Chemical and Chemical Engineering, Shandong University of Technology, Zibo 255049, People's Republic of China
| | - Hui Liu
- College of Chemical and Chemical Engineering, Shandong University of Technology, Zibo 255049, People's Republic of China
| | - Dacheng Li
- College of Chemical and Chemical Engineering, Liaocheng University, Liaocheng 252059, People's Republic of China
| | - Qingyun Liu
- College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266510, People's Republic of China
| | - Daopeng Zhang
- College of Chemical and Chemical Engineering, Shandong University of Technology, Zibo 255049, People's Republic of China
| | - Zhen Zhou
- College of Chemical and Chemical Engineering, Shandong University of Technology, Zibo 255049, People's Republic of China
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13
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Shin JW, Jeong AR, Jeong JH, Zenno H, Hayami S, Min KS. Two-dimensional square-grid iron(ii) coordination polymers showing anion-dependent spin crossover behavior. RSC Adv 2020; 10:5040-5049. [PMID: 35498313 PMCID: PMC9049044 DOI: 10.1039/c9ra09782a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 01/24/2020] [Indexed: 11/21/2022] Open
Abstract
Two Fe(ii)-based coordination polymers [Fe(tpmd)2(NCS)2]·5.5H2O (1) and [Fe(tpmd)2(NCSe)2]·7H2O (2) with the framework of square-grid type have been assembled from FeSO4·7H2O, N,N,N',N'-tetrakis(pyridin-4-yl)methanediamine (tpmd), and KNCS/KNCSe in methanol and characterized. By utilizing two pyridine groups of a tpmd ligand, 1 and 2 are formed in two-dimensional layered structures through coordination of octahedral iron(ii) ions with the tpmd to NCS-/NCSe- ligands in which they have a supramolecular isomorphous conformation. 1 shows a paramagnetic behavior between 2 and 300 K, while 2 exhibits two-step spin crossover (ca. 145 and 50 K) in the temperature range due to the coordination of NCSe- ligands. At 300 K 2 is fully high-spin state. However, at 100 K 2 becomes ca. 50% high spin and 50% low spin iron(ii) ions, which is verified by magnetic moments. In the structural analysis of 2 at 100 K, two different layers are observed with different bond distances around iron(ii) ions in which the layers are stacked alternately.
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Affiliation(s)
- Jong Won Shin
- Department of Chemistry, Kyungpook National University Daegu 41566 Republic of Korea
| | - Ah Rim Jeong
- Department of Chemistry, Kyungpook National University Daegu 41566 Republic of Korea
| | - Jong Hwa Jeong
- Department of Chemistry, Kyungpook National University Daegu 41566 Republic of Korea
| | - Hikaru Zenno
- Department of Chemistry, Kumamoto University Kumamoto 860-8555 Japan
| | - Shinya Hayami
- Department of Chemistry, Kumamoto University Kumamoto 860-8555 Japan
| | - Kil Sik Min
- Department of Chemistry Education, Kyungpook National University Daegu 41566 Republic of Korea
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14
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Yao ZS, Tang Z, Tao J. Bistable molecular materials with dynamic structures. Chem Commun (Camb) 2020; 56:2071-2086. [DOI: 10.1039/c9cc09238b] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In this Feature Article, we introduce how to manipulate the motion of electrons or molecules by external stimuli, to achieve switchable properties in molecule-based single crystals.
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Affiliation(s)
- Zi-Shuo Yao
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry and Chemical Engineering
- Liangxiang Campus
- Beijing Institute of Technology
- Beijing 102488
| | - Zheng Tang
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry and Chemical Engineering
- Liangxiang Campus
- Beijing Institute of Technology
- Beijing 102488
| | - Jun Tao
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry and Chemical Engineering
- Liangxiang Campus
- Beijing Institute of Technology
- Beijing 102488
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15
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Lan W, Valverde-Muñoz FJ, Dou Y, Hao X, Muñoz MC, Zhou Z, Liu H, Liu Q, Real JA, Zhang D. A thermal- and light-induced switchable one-dimensional rare loop-like spin crossover coordination polymer. Dalton Trans 2019; 48:17014-17021. [PMID: 31693028 DOI: 10.1039/c9dt03285a] [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
Rare loop-like isostructural one-dimensional coordination polymer (1D-CP) systems formulated as {Fe(DPIP)2(NCSe)2}n·4DMF (1) and {Fe(DPIP)2(NCSe)2}n·4DMF (2) were obtained by self-assembling FeII and pseudohalide NCX-(X = S, Se) ions in presence of the V-shaped bidentate bridging ligand, namely, N,N'-dipyridin-4-ylisophthalamide (DPIP), and were characterized by elemental analysis, IR spectroscopy, TGA, single crystal X-ray diffraction and powder X-ray diffraction. The magnetic studies show that complex 2 undergoes a complete thermally induced spin crossover (SCO) behavior centered at T1/2 = 120 K with ca. 5 K thermal hysteresis loop and light-induced excited spin state trapping effect (LIESST) with TLIESST = 65 K. However, either the homologous X = S (1) or the desolvated form of complex 2 is high spin at all temperatures, proving further the concerted synergy for the SCO of 2 between the intrinsic ligand field and that indirectly induced via hydrogen bond interaction. The current results provide valuable information for the design of new 1D SCO systems via the rational control of the cooperated effects derived from the intramolecular coordination bond and the intermolecular supramolecular interactions.
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Affiliation(s)
- Wenlong Lan
- College of Chemical and Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China.
| | - Francisco Javier Valverde-Muñoz
- Instituto de Ciencia Molecular (ICMol), Universitat de València, C/Catedrático José Beltrán Martínez 2, 46980 Paterna, Valencia, Spain.
| | - Yong Dou
- College of Chemical and Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China.
| | - Xiaoyun Hao
- College of Chemical and Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China.
| | - M Carmen Muñoz
- Departamento de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, E-46022 Valencia, Spain
| | - Zhen Zhou
- College of Chemical and Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China.
| | - Hui Liu
- College of Chemical and Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China.
| | - Qingyun Liu
- College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266510, PR China
| | - José Antonio Real
- Instituto de Ciencia Molecular (ICMol), Universitat de València, C/Catedrático José Beltrán Martínez 2, 46980 Paterna, Valencia, Spain.
| | - Daopeng Zhang
- College of Chemical and Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China.
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16
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Ding Y, Ma QQ, Kang J, Zhang J, Li S, Chen X. Palladium(ii) complexes supported by PBP and POCOP pincer ligands: a comparison of their structure, properties and catalytic activity. Dalton Trans 2019; 48:17633-17643. [PMID: 31755493 DOI: 10.1039/c9dt03954f] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A Pd(ii) chloride complex supported by a Yamashita-Nozaki PBP pincer ligand, [C6H4-1,2-(NCH2PtBu2)2B]PdCl (1a), was synthesized. The structure, properties and catalytic activity of complex 1a were compared with those of the corresponding POCOP pincer complex [C6H3-2,6-(OPtBu2)2]PdCl (2a). It was found that the Pd centre in complex 1a is more electron rich and easier to be oxidized than that in complex 2a; complex 1a is a much better catalyst for Suzuki-Miyaura cross-coupling reactions than complex 2a. Starting from complexes 1a and 2a, two series of Pd(ii) pincer complexes bearing a SH, BH4, N[combining low line]CS, N[combining low line]CSe or N3 covalent ligand, [C6H4-1,2-(NCH2PtBu2)2B]PdY (Y = SH, 1b; BH4; 1c; N[combining low line]CS, 1d; N[combining low line]CSe, 1e; and N3, 1f) and [C6H3-2,6-(OPtBu2)2]PdY (Y = SH, 2b; BH4, 2c; N[combining low line]CS, 2d; N[combining low line]CSe, 2e; and N3, 2f), were synthesized and fully characterized. Single crystal X-ray diffraction analysis indicated that the Pd centre is less tightly chelated in PBP pincer complexes. The strong σ-donor ability of the PBP pincer ligand has little influence on the structure of the covalent ligand possessing both σ-donor and π-acceptor properties. However, the stretching vibrational frequencies of N[combining low line]CS, N[combining low line]CSe and N3 ligands and the coordination mode of the BH4 ligand are significantly different in these two types of palladium pincer complexes.
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Affiliation(s)
- Yazhou Ding
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
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