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Mao PD, Zhang SH, Yao NT, Sun HY, Yan FF, Zhang YQ, Meng YS, Liu T. Regulating Magnetic Relaxations of Cyano-Bridged {Dy III Mo V } Systems by Tuning the N-Sites in β-Diketone Ligands. Chemistry 2023; 29:e202301262. [PMID: 37272418 DOI: 10.1002/chem.202301262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 05/28/2023] [Accepted: 05/30/2023] [Indexed: 06/06/2023]
Abstract
Cyano-bridged 4d-4f molecular nanomagnets have re-called increasing research interests in molecular magnetism since they offer more possibilities in achieving novel nanomagnets with versatile structures and magnetic interactions. In this work, four β-diketone ligands bearing different substitution N-sites were designed and synthesized, namely 1-(2-pyridyl)-3-(3-pyridyl)-1,3-propanedione (HL1 ), 1,3-Bis (3-pyridyl)-1,3-propanedione (HL2 ), 1-(4-pyridyl)-3-(3-pyridyl)-1,3-propanedione (HL3 ), and 1,3-Bis (4-pyridyl)-1,3-propanedione (HL4 ), to tune the magnetic relaxation behaviors of cyano-bridged {DyIII MoV } systems. By reacting with DyCl3 ⋅ 6H2 O and K4 Mo(CN)8 ⋅ 2H2 O, four cyano-bridged complexes, namely {[Dy[MoV (CN)8 ](HL1 )2 (H2 O)3 ]} ⋅ 6H2 O (1), {[Dy[MoV (CN)8 ](HL2 )(H2 O)3 (CH3 OH)]}2 ⋅ 2CH3 OH ⋅ 3H2 O (2), {[Dy[MoV (CN)8 ](HL3 )(H2 O)2 (CH3 OH)] ⋅ H2 O}n (3), and {[Dy[MoV (CN)8 ](HL4 )2 (H2 O)3 ]} ⋅ 2H2 O⋅CH3 OH (4) were obtained. Structural analyses revealed that 1 and 4 are binuclear complexes, 2 has a tetragonal structure, and 3 exhibits a stair-like polymer chain structure. The DyIII ions in all complexes have eight-coordinated configurations with the coordination spheres DyO7 N1 for 1 and 4, DyO6 N2 for 2, and DyO5 N3 for 3. Magnetic measurements indicate that 1 is a zero-field single-molecule magnet (SMM) and complexes 2-4 are field-induced SMMs, with complex 4 featuring a two-step relaxation process. The magnetic characterizations and ab initio calculations revealed that changing the N-sites in the β-diketone ligands can effectively alter the structures and magnetic properties of cyano-bridged 4d-4f nanomagnets by adjusting the coordination environments of the DyIII centers.
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Affiliation(s)
- Pan-Dong Mao
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China
| | - Shi-Hui Zhang
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China
| | - Nian-Tao Yao
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China
| | - Hui-Ying Sun
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China
| | - Fei-Fei Yan
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China
| | - Yi-Quan Zhang
- Jiangsu Key Lab for NSLSCS, School of Physical Science and Technology, Nanjing Normal University, Nanjing, 210023, China
| | - Yin-Shan Meng
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, 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, Dalian, 116024, China
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Yan FF, Jiang WJ, Yao NT, Mao PD, Zhao L, Sun HY, Meng YS, Liu T. Manipulating fluorescence by photo-switched spin-state conversions in an iron(ii)-based SCO-MOF. Chem Sci 2023; 14:6936-6942. [PMID: 37389243 PMCID: PMC10306093 DOI: 10.1039/d3sc01217d] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 05/25/2023] [Indexed: 07/01/2023] Open
Abstract
Manipulating fluorescence by photo-switched spin-state conversions is an attractive prospect for applications in smart magneto-optical materials and devices. The challenge is how to modulate the energy transfer paths of the singlet excited state by light-induced spin-state conversions. In this work, a spin crossover (SCO) FeII-based fluorophore was embedded into a metal-organic framework (MOF) to tune the energy transfer paths. Compound 1 {Fe(TPA-diPy)[Ag(CN)2]2}·2EtOH (1) has an interpenetrated Hofmann-type structure, wherein the FeII ion is coordinated by a bidentate fluorophore ligand (TPA-diPy) and four cyanide nitrogen atoms and acts as the fluorescent-SCO unit. Magnetic susceptibility measurements revealed that 1 underwent an incomplete and gradual spin crossover with T1/2 = 161 K. Photomagnetic studies confirmed photo-induced spin state conversions between the low-spin (LS) and high-spin (HS) states, where the irradiation of 532 and 808 nm laser lights converted the LS and HS states to the HS and LS states, respectively. Variable-temperature fluorescence spectra study revealed an anomalous decrease in emission intensity upon the HS → LS transition, confirming the synergetic coupling between the fluorophore and SCO units. Alternating irradiation of 532 and 808 nm laser lights resulted in reversible fluorescence intensity changes, confirming spin state-controlled fluorescence in the SCO-MOF. Photo-monitored structural analyses and UV-vis spectroscopic studies demonstrated that the photo-induced spin state conversions changed energy transfer paths from the TPA fluorophore to the metal-centered charge transfer bands, ultimately leading to the switching of fluorescence intensities. This work represents a new prototype compound showing bidirectional photo-switched fluorescence by manipulating the spin states of iron(ii).
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Affiliation(s)
- Fei-Fei Yan
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Wen-Jing Jiang
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Nian-Tao Yao
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Pan-Dong Mao
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Liang Zhao
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Hui-Ying Sun
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, 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, Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Tao Liu
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian University of Technology 2 Linggong Road Dalian 116024 China
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Sun HY, Meng YS, Zhao L, Yao NT, Mao PD, Liu Q, Yan FF, Oshio H, Liu T. Colossal Anisotropic Thermal Expansion through Coupling Spin Crossover and Rhombus Deformation in a Hexanuclear {FeIII4FeII2} Compound. Angew Chem Int Ed Engl 2023:e202302815. [PMID: 37178444 DOI: 10.1002/anie.202302815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 04/15/2023] [Accepted: 05/11/2023] [Indexed: 05/15/2023]
Abstract
Colossal and anisotropic thermal expansion is a key function for microscale or nanoscale actuators in material science. Herein, we present a hexanuclear compound of [(Tp*)FeIII(CN)3]4[FeII(Ppmp)]2·2CH3OH (1, Tp* = hydrotris(3,5-dimethyl-pyrazol-1-yl)borate and Ppmp = 2-[3-(2'-pyridyl)pyrazol-1-ylmethyl]pyridine), which has a rhombic core structure abbreviated as {FeIII2FeII2}. Magnetic susceptibility measurements and single-crystal X-ray diffraction analyses revealed that 1 underwent temperature-induced spin transition with the thermal hysteresis. The FeII site in 1 behaved as a spin crossover (SCO) unit, and significant deformation of its octahedron was observed during the spin transition process. Moreover, the distortion of the FeII centers actuated anisotropic deformation of the rhombic {FeIII2FeII2} core, which was spread over the whole crystal through the subsequent molecular rearrangements, leading to the colossal anisotropic thermal expansion. Our results provide a rational strategy for realizing the colossal anisotropic thermal expansion and shape memory effects by tuning the magnetic bistability.
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Affiliation(s)
- Hui-Ying Sun
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
| | - Yin-Shan Meng
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
| | - Liang Zhao
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
| | - Nian-Tao Yao
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
| | - Pan-Dong Mao
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
| | - Qiang Liu
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
| | - Fei-Fei Yan
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
| | - Hiroki Oshio
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
| | - Tao Liu
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, 2 Linggong Rd., 116024, Dalian, CHINA
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Yi C, Zhang SH, Zhao L, Yao NT, Zhao GH, Meng YS, Liu T. Constructing spin crossover-fluorescence bifunctional iron(II) complexes based on tetraphenyl ethylene-decorated AIEgens. Dalton Trans 2023; 52:5169-5175. [PMID: 36961301 DOI: 10.1039/d2dt04130h] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
Investigating spin crossover (SCO)-fluorescence bifunctional materials and establishing their structure-function relationships are attractive topics in chemistry and materials science. However, it remains challenging to preserve the fluorescence and SCO properties simultaneously in aggregated solid states. Herein, we design an (E)-2,6-bis(1H-pyrazol-1-yl)-4-(4-(1,2,2-triphenylvinyl)styryl)pyridine (tpe-bpp) ligand, which contains coordinated SCO and fluorescence units of an aggregation-induced emission luminogen (AIEgen). The coordination of the tpe-bpp ligand with different FeII salts generated three mononuclear complexes: [Fe(tpe-bpp)2](ClO4)2·5.75CH2Cl2 (1), [Fe(tpe-bpp)2](ClO4)2·CH2Cl2·3CH3OH (2) and [Fe(tpe-bpp)2](BF4)2·CH2Cl2·3CH3OH (3). Single-crystal X-ray diffraction studies showed that they shared a similar [Fe(tpe-bpp)2]2+ complex cation. Their counterions and co-crystallized solvents were different. Magnetic measurements revealed that 1, 2, and 3 exhibited a complete SCO behavior with the transition temperatures T1/2 of 375, 260, and 248 K, respectively. Fluorescence measurements confirmed the existence of the AIE property for both the tpe-bpp ligand and Fe(II) complexes. A monotonic decrease of the photoluminescence (PL) intensity upon increasing the temperature was behavior observed for all three complexes.
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Affiliation(s)
- Cheng Yi
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Shi-Hui Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Liang Zhao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Nian-Tao Yao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Guo-Hui Zhao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Yin-Shan Meng
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Tao Liu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
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Yao NT, Zhao L, Sun HY, Yi C, Guan YH, Li YM, Oshio H, Meng YS, Liu T. Simultaneous Photo‐Induced Magnetic and Dielectric Switching in an Iron(II)‐Based Spin‐Crossover Hofmann‐Type Metal‐Organic Framework. Angew Chem Int Ed Engl 2022; 61:e202208208. [DOI: 10.1002/anie.202208208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Nian-Tao Yao
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Road 116024 Dalian CHINA
| | - Liang Zhao
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Rd. 116024 Dalian CHINA
| | - Hui-Ying Sun
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Rd., Dalian, 116024, China. 116024 Dalian CHINA
| | - Cheng Yi
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Rd. 116024 Dalian CHINA
| | - Ya-Hui Guan
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Rd. 116024 Dalian CHINA
| | - Ya-Ming Li
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Rd. 116024 Dalian CHINA
| | - Hiroki Oshio
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Rd. 116024 Dalian CHINA
| | - Yin-Shan Meng
- Dalian University of Technology State Key Laboratory of Fine Chemicals 2 Linggong Rd., Dalian, 116024, China. 116024 Dalian CHINA
| | - Tao Liu
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Rd. 116024 Dalian CHINA
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Yao NT, Zhao L, Sun HY, Yi C, Guan YH, Li YM, Oshio H, Meng YS, Liu T. Simultaneous Photo‐Induced Magnetic and Dielectric Switching in an Iron(II)‐Based Spin‐Crossover Hofmann‐Type Metal‐Organic Framework. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202208208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Nian-Tao Yao
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Road 116024 Dalian CHINA
| | - Liang Zhao
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Rd. 116024 Dalian CHINA
| | - Hui-Ying Sun
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Rd., Dalian, 116024, China. 116024 Dalian CHINA
| | - Cheng Yi
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Rd. 116024 Dalian CHINA
| | - Ya-Hui Guan
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Rd. 116024 Dalian CHINA
| | - Ya-Ming Li
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Rd. 116024 Dalian CHINA
| | - Hiroki Oshio
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Rd. 116024 Dalian CHINA
| | - Yin-Shan Meng
- Dalian University of Technology State Key Laboratory of Fine Chemicals 2 Linggong Rd., Dalian, 116024, China. 116024 Dalian CHINA
| | - Tao Liu
- Dalian University of Technology State Key Laboratory of Fine Chemicals No.2 Linggong Rd. 116024 Dalian CHINA
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7
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Wen W, Liu Q, Zhang SH, Yao NT, Oshio H, Meng YS, Liu T. Spin‐Crossover Tuned Rotation of Pyrazolyl Rings in a 2D Iron(II) Complex towards Synergetic Magnetic and Dielectric Transitions. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202208886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Wen Wen
- Dalian University of Technology State Key Laboratory of Fine Chemicals 2 Linggong Rd. 116024 Dalian CHINA
| | - Qiang Liu
- Dalian University of Technology State Key Laboratory of Fine Chemicals 2 Linggong Rd. 116024 Dalian CHINA
| | - Shi-Hui Zhang
- Dalian University of Technology State Key Laboratory of Fine Chemicals 2 Linggong Rd. 116024 Dalian CHINA
| | - Nian-Tao Yao
- Dalian University of Technology State Key Laboratory of Fine Chemicals 2 Linggong Rd. 116024 Dalian CHINA
| | - Hiroki Oshio
- Dalian University of Technology State Key Laboratory of Fine Chemicals 2 Linggong Rd. 116024 Dalian CHINA
| | - Yin-Shan Meng
- Dalian University of Technology State Key Laboratory of Fine Chemicals 2 Linggong Rd., Dalian, 116024, China. 116024 Dalian CHINA
| | - Tao Liu
- Dalian University of Technology State Key Laboratory of Fine Chemicals 2 Linggong Rd. 116024 Dalian CHINA
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Li RX, Sun HY, Liang HC, Yi C, Yao NT, Meng YS, Xiong J, Liu T, Zhu YY. Slow magnetic relaxation in mononuclear octa-coordinate Fe(II) and Co(II) complexes from a Bpybox ligand. Dalton Trans 2022; 51:8865-8873. [PMID: 35635033 DOI: 10.1039/d2dt00865c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two 3d transition metal mononuclear complexes, [(FeL2)(ClO4)2]2·CH3CN (1) and (CoL2)(ClO4)2·2CH3CN (2), have been prepared from a rigid tetradentate bpybox (L = 6,6'-bis(2,5-dihydrooxazol-4-yl)-2,2'-bipyridine) ligand. Single crystal X-ray diffraction analyses together with the help of calculations show that both compounds are octa-coordinate. Direct current magnetic studies reveal their significant magnetic anisotropy. Impressively, field-induced relaxation of magnetism is observed in the two complexes and the apparent anisotropy barriers are 14.1 K for 1 and 21.6 K for 2, respectively. Theoretical calculations reveal that two Fe(II) centers in 1 have small negative D values of -4.897 and -4.825 cm-1 and relatively small E values of 0.646 and 0.830 cm-1, indicating a uniaxial magnetic anisotropy. In contrast, the D and E values in the Co(II) center of 2 are 46.42 cm-1 and 11.51 cm-1, featuring a rhombic anisotropy. This work demonstrates that field-induced slow magnetic relaxation in 3d transition metal complexes with high coordination numbers can be manipulated through rigid ligand design.
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Affiliation(s)
- Rui-Xia Li
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Hui-Ying Sun
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Hai-Chao Liang
- School of Chemistry and Chemical Engineering, Hefei University of Technology and Anhui Key Laboratory of Advanced Functional Materials and Devices, Hefei 230009, China.
| | - Cheng Yi
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Nian-Tao Yao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Yin-Shan Meng
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Jin Xiong
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
| | - Tao Liu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Yuan-Yuan Zhu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China. .,School of Chemistry and Chemical Engineering, Hefei University of Technology and Anhui Key Laboratory of Advanced Functional Materials and Devices, Hefei 230009, China.
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Yi C, Meng YS, Zhao L, Yao NT, Liu Q, Wen W, Li RX, Zhu YY, Oshio H, Liu T. A Smart Molecule Showing Spin Crossover Responsive Aggregation-Induced Emission. CCS Chem 2022. [DOI: 10.31635/ccschem.022.202201950] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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You M, Shao D, Deng YF, Yang J, Yao NT, Meng YS, Ungur L, Zhang YZ. [Au I(CN) 2]-Armed [Fe III2Fe II2] Square Complex Showing Unusual Spin-Crossover Behavior Due to a Symmetry-Breaking Phase Transition. Inorg Chem 2022; 61:5855-5860. [PMID: 35377631 DOI: 10.1021/acs.inorgchem.2c00192] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The incorporation of two different cyanide building blocks of [(TpR)FeIII(CN)3]- and [AuI(CN)2]- into one molecule afforded a novel hexanuclear [FeIII2FeII2AuI2] complex (1·2Et2O), in which the cyanide-bridged [FeIII2FeII2] square was further grafted by two [AuI(CN)2]- fragments as long arms in syn orientations. Complex 1·2Et2O undergoes a gradual spin crossover (SCO) ffrom low-spin (LS) to high-spin (HS) state for the Fe(II) centers upon desolvation. Remarkably, its desolvated phase (1) exhibits a reversible but atypical two-step (sharp-gradual) SCO behavior with considerable hysteresis (21 K). Variable-temperature single-crystal X-ray structural studies reveal that the hysteretic spin transition takes place synchronously with the concerted displacive motions of the molecules, representing another rare example including multistep and hysteretic spin transitions due to the synergetic SCO and structural phase transition.
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Affiliation(s)
- Maolin You
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China.,Department of Chemistry, National University of Singapore, Science Drive 3, Singapore 117543
| | - Dong Shao
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Yi-Fei Deng
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Jiong Yang
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Nian-Tao Yao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China
| | - Yin-Shan Meng
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China
| | - Liviu Ungur
- Department of Chemistry, National University of Singapore, Science Drive 3, Singapore 117543
| | - Yuan-Zhu Zhang
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
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Liu Q, Yao NT, Sun HY, Hu JX, Meng YS, Liu T. Light actuated single-chain magnet with magnetic coercivity. Inorg Chem Front 2022. [DOI: 10.1039/d2qi01371a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A cyanide-bridged {Fe2Co}-based coordination polymer was synthesized. It showed photo-induced slow relaxation of magnetization and a coercive field of 400 Oe.
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Affiliation(s)
- Qiang Liu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, China
| | - Nian-Tao Yao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, China
| | - Hui-Ying Sun
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, China
| | - Ji-Xiang Hu
- College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, 266071, China
| | - Yin-Shan Meng
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, China
| | - Tao Liu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, China
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Meng YS, Yao NT, Zhao L, Yi C, Liu Q, Li YM, Oshio H, Liu T. Manipulating Selective Metal-to-Metal Electron Transfer to Achieve Multi-Phase Transitions in an Asymmetric [Fe2Co]-Assembled Mixed-Valence Chain. Angew Chem Int Ed Engl 2021; 61:e202115367. [PMID: 34971479 DOI: 10.1002/anie.202115367] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Indexed: 11/08/2022]
Abstract
Manipulation of multi-functions in molecular materials is promising for future switching and memory devices, although is currently difficult. Herein, we assembled the asymmetric {Fe2Co} unit into a cyanide-bridged mixed-valence chain {[(Tp)Fe(CN)3]2Co(BIT)}·2CH3OH (1) (Tp = hydrotris(pyrazolyl)borate and BIT = 3,4-bis-(1H-imidazol-1-yl)thiophen), which showed reversible multi-phase transitions accompanied by the photo-switchable single-chain magnet property and dielectric anomalies. Variable temperature X-ray structural studies revealed thermo-and photo-induced selective electron transfer (ET) between the Co and one of the Fe ions. Alternating-current magnetic susceptibility studies revealed that 1 displayed on and off of the single-chain magnet behavior by alternating 946-nm and 532-nm light irradiations. A substantial anomaly in dielectric constant was discovered during the electron transfer process, which is uncommon in similar ET complexes. These findings illustrate that 1 provided a new platform for multi-phase transitions and multi-switches adjusted by selective metal-to-metal ET.
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Affiliation(s)
- Yin-Shan Meng
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, 2 Linggong Rd., Dalian, 116024, China., 116024, Dalian, CHINA
| | - Nian-Tao Yao
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
| | - Liang Zhao
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
| | - Cheng Yi
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
| | - Qiang Liu
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
| | - Ya-Ming Li
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
| | - Hiroki Oshio
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
| | - Tao Liu
- Dalian University of Technology, State Key Laboratory of Fine Chemicals, CHINA
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Yang YK, Jiao CQ, Meng YS, Yao NT, Jiang WJ, Liu T. Substituent effect on metal-to-metal charge transfer behavior of cyanide-bridged {Fe2Co2} square. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2021.108712] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
A novel macrocyclic zirconocene(iv) aromatic selenite [(CpZr)8L16]·2(Cp4Zr2(μ-O)Cl2) (complex 1) (Cp = cyclopentadienyl anion; L = 4-fluorobenzeneseleninic acid) was prepared by the reaction of bis(cyclopentadienyl)zirconium dichloride with 4-fluorobenzeneseleninic acid and characterized by elemental analysis, infrared spectroscopy, 1H, 13C NMR spectroscopy, ESI-MS, XRD and X-ray diffraction.
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Affiliation(s)
- Nian-Tao Yao
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Ru-Fen Zhang
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Shao-Liang Zhang
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Qian-Li Li
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Chun-Lin Ma
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
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