RSC Advances
·
2024
·Vol. 14
·期 38
·27789-27798
·
IF 3.9
Zhipeng Xu,Yongliang Qin,Dongdong Wei,Jie Jin,Long Zheng,Jie Xu,Hui Liu,Ranran Chen,Di Wang
The study of the magnetism of tightly arranged nitronyl nitroxide (NN) radicals via Au–S self-assembly is interesting. In this study, a series of radicals (S-NN, D-NN, BS-NN, BD-NN) along with two types of nanomaterials (S-NPs, D-NPs) were synthesized. NN was chosen for the magnetic units. Their structures have been successfully synthesized and analyzed. The spin magnetic properties were characterized by electron paramagnetic resonance (EPR) and superconducting quantum interference device (SQUID) measurement. The analysis revealed that the self-assembled NN formed via Au–S bonds exhibits high packing density. Furthermore, it was gratifying to observe that the AuNPs exhibit ferromagnetism after the surface modification by NN. This results in strong ferromagnetic exchange interactions of S-NPs and D-NPs : JS-NPs = +279.715 K and JD-NPs = +254.913 K, respectively.
研究领域:
材料科学
·
磁学
·
化学合成
✓ 已验证
DOI
PubMed
高影响因子
AIP Advances
·
2024
·Vol. 14
·期 5
·
IF 1.4
Liu Peng,Ren Weijun,Guo Qing,Zhang Zhao,Zhao Xueting,Zhang Zhidong,Dai Wei,Li Bing
Cryogenic refrigeration technology based on magnetocaloric effects plays a critical role in a variety of technological applications. In this paper, we report the cryogenic magnetocaloric effects of a series of sodium-rare earth fluoride samples (Ln = Gd, Tb, Dy, Ho, Er, Tm, Yb) synthesized by the solid-state reaction method. These compounds all crystallize in a hexagonal crystal structure. Down to 2 K, no magnetic ordering was detected, while all compounds show negative Curie–Weiss temperatures indicative of strong antiferromagnetic coupling. Magnetic fields effectively suppress the magnetic fluctuations, leading to a maximum magnetic entropy change of −56 J kg −1 K −1 in NaGdF 4 at the magnetic field change from 0 to 50 kOe. These series of compounds are potentially excellent magnetic refrigerants at low temperatures.
研究领域:
物理学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Synthesis
·
2025
·
IF 20
Sheng Weiming,Xie Fei,Rajeshkumar Thayalan,Zhao Yue,Jiang Yufei,Chen Wang,Ye Shengfa,Maron Laurent,Zhu Congqing
Theoretical studies predict that homoatomic metal–metal bonds of f -block actinide elements should be ubiquitous. Surprisingly, however, the isolation and characterization of compounds featuring an actinide–actinide bond has proven challenging and the field remains undeveloped. Here we report a well-defined thorium dimer featuring a Th–Th two-centre one-electron (2c-1e) σ bond and a 2c-1e π bond. This thorium dimer was synthesized by reducing a Th(IV) chloride complex with potassium metal in tetrahydrofuran. Magnetic measurements indicate that this thorium dimer features exceedingly strong antiferromagnetic coupling between the two formal Th(III) centres with a coupling constant J ≤ −1,200 cm −1 such that the Th–Th interaction has covalent bond character. Detailed computational investigations further support the existence of the Th–Th bond in this molecule. These results demonstrate that diactinide complexes with actinide–actinide bonds are accessible but require an appropriate ligand framework to stabilize low-valent actinide centres.
研究领域:
无机化学
·
理论化学
·
配位化学
✓ 已验证
DOI
高影响因子
TRANSITION METAL CHEMISTRY
·
2018
·Vol. 43
·期 5
·431-437
·
IF 1.261
Luo Su-ping,Jiang Wen-xing,Zhan Shu-zhong
A dinuclear copper(II) complex [Cu 2 L 4 ] has been prepared by the reaction of CuCl 2 ·2H 2 O and 1-[(2-iodo)benzene]-3-[benzothiazole] triazene (HL). The complex has been characterized by X-ray crystallography and by physico-chemical and spectroscopic methods. In the solid state, there is a significant antiferromagnetic coupling between the copper(II) centers with a coupling constant (J) of − 558 cm −1 . In homogeneous solution, the complex shows electrocatalytic activities for hydrogen generation from both acetic acid and neutral buffer with a turnover frequency of 50 mol of H 2 per mole of catalyst per hour (mol H 2 /mol catalyst/h) at an overpotential (OP) of 941.6 mV, and 502 mol H 2 /mol catalyst/h at an OP of 836.7 mV.
研究领域:
无机化学
·
配位化学
·
材料化学
·
催化化学
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Huicai Xie,Quanyi Liu,Xiaohua Luo,Shengcan Ma,Xinqiang Gao,Zhenxing Li,Zhaojun Mo,Jun Shen
For more practical applications, research on magnetic refrigeration has been gradually focused on developing refrigerants with large magnetocaloric effect (MCE) under low magnetic fields (≤2 T). EuTiO 3 exhibits considerable low-field MCE near ordering temperature, meanwhile the magnetic switch from antiferromagnetic to ferromagnetic (AFM-FM) in it provides the feasibility of improving the magnetocaloric performance. In this study, a series of Eu(Ti,Nb,M)O 3 (M=Cu or Zn) compounds were synthesized, and the crystal structure, magnetic properties together with cryogenic MCEs were investigated in detail. The co-substitution contributes to an FM coupling domination in all the compounds. Besides, significantly enhanced and giant low-field MCEs were detected in these compounds. Under the field change of 1 T, all the samples possess remarkable magnetic entropy change (>15 J·kg -1 ·K -1 ) around 5 K without hysteresis. The corresponding refrigerating capacities are calculated to be 68.0, 72.6, 76.0, and 69.6 J·kg -1 , respectively, exhibiting an increase of 149–178% than EuTiO 3 . The outstanding magnetocaloric performances make the Eu(Ti,Nb,M)O 3 (M=Cu or Zn) compounds competitive candidates for cryogenic magnetic refrigeration.
研究领域:
材料科学
·
凝聚态物理
·
功能材料
·
低温工程
·
磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 19
·1-11
·
IF 2.8
Li Canglong,Wen Kexin,Zhang Bing,Chen Jie,Niu Xinshuai,Zou Boyuan,Lu Xuechi,Yang Wenqian
The structure, magnetic behavior and magnetocaloric performance in heavy rare–earth based compounds Tb 2 M TiO 6 ( M = Co, Ni, Cu) have been experimentally investigated in this work. The structural analysis indicates that Tb 2 CoTiO 6 and Tb 2 NiTiO 6 crystallize in a monoclinic double perovskite structure, while Tb 2 CuTiO 6 forms a hexagonal layered structure. The magnetic measurements reveal that the samples show high magnetic reversibility within a wide temperature range. The high-temperature Curie–Weiss fitting suggests that the antiferromagnetic coupling between RE 3+ and RE 3+ is dominant at low temperatures. The Arrott-plots imply that the magnetic transition in Tb 2 M TiO 6 is of second–order nature according to the Banerjee’s criteria. The magnetic entropy change − Δ S M is evaluated to be 10.7, 16.2 and 13.2 J kg −1 K −1 for Tb 2 CoTiO 6 , Tb 2 NiTiO 6 and Tb 2 CuTiO 6 at 4 K and magnetic field change Δ H = 6 T, respectively. The work suggests that the lack of 3 d –3 d coupling in the design of double perovskites is one of the potential approaches for developing low-temperature magnetic refrigeration materials.
研究领域:
材料科学
·
固体物理
·
磁学
·
低温制冷材料
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·Vol. 35
·期 28
·2501047
·
IF 19
Jiantao Du,Kun He,Junyang Chen,Yangkun He,Miao He,Xitong Xu,Zhe Qu,Lin Gu,Qinghua Zhang,Xidong Duan,Mingyuan Huang,Chengbao Jiang,Bo Li,Shengxue Yang
Van der Waals (vdW) magnets have opened up new avenues for exploring next-generation spintronic devices. The exchange bias (EB) effect plays an undisputed role in ensuring accurate data retrieval in spintronic devices. However, the unsustainably weak EB field ( H EB ) introduced by field cooling and the high-complexity of devices incompatible with silicon-based industry, limit the application of related vdW spintronic devices. Here, a compatible and simple method is reported for constructing Fe 3 GaTe 2 /oxidized Fe 3 GaTe 2 heterostructures and achieving a spontaneous EB effect with a low-complexity device configuration. The spontaneous EB effect exhibits undecayed, tunable, and giant H EB of 2550 Oe at 3 K, along with a relatively high blocking temperature of 220 K. Field cooling and cross-sectional microstructure studies suggest that the EB effect arises from antiferromagnetic exchange coupling between Fe 3 GaTe 2 and spin clusters frozen by α-Fe 2 O 3 at the disordered interface. This work provides a unique avenue for customizing, integrating, and producing related spintronic devices.
研究领域:
自旋电子学
·
凝聚态物理
·
材料科学
·
磁性
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Yuanjie Wang,Tengfei Cao,Zhihuang Xu,Liwang Ye,yingui Gao,Xinxin Zhuang
Mn 2+ -based halides show great promise for solid-state lighting and display applications owing to their structural flexibility and excellent luminescence properties. Herein, three hybrid manganese halides (N-AEP)[MnBr 3 (H 2 O) 3 ] 2 ·Br ( 1 ), [(N-AEP) 2 MnBr 6 ]·2Br ( 2 ) and [(N-AEP) 2 MnBr 4 ]·3Br(H 2 O) ( 3 ) with the same organic ligand have been successfully synthesized by adjusting various HBr level or temperature of growth solutions. Systematic characterizations of halides including crystal structure, thermal and photophysical properties were carried out. Their distinct inorganic groups lead to the various luminescence colors: purple-red light in 1 , orange-red light in 2 and green light in 3 . Some interesting physicochemical features, for 1 the temperature-dependent emission properties, 2 the satisfactory thermostability with higher PLQY (13.36%), and 3 the weak ferromagnetic coupling effect, broaden their application prospects. This paper offers sufficient synthetic experiences for Mn 2+ -based halides with different inorganic groups in detail, and provides a reasonable research scheme for their optical properties .
研究领域:
材料科学
·
化学
·
光电
·
固态照明
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Jie Xue,Ziyu Wang,Andrew Comstock,Zhiyu Wang,Herman H. Y. Sung,Ian D. Williams,Dali Sun,Junwei Liu,Haipeng Lu
Recent discoveries of novel physics in two-dimensional (2D) magnetic materials have sparked the search of new layered magnetic semiconductors. Compared to the traditional inorganic 2D van der Waals crystals, hybrid organic–inorganic metal–halide frameworks offer significantly enhanced chemical and structural versatility, where their optical, electronic, and magnetic properties can be readily modulated with both organic and inorganic components. Here, we reported a series of new Fe–Cl-based layered double perovskites LnMIMIIICl8, [n = 4, L = phenylethylammonium or chiral R-(+)-β-methylphenethylammonium and n = 2, L = 1,4-butanediammonium; MI = Ag/Na; MIII = Fe/In]. UV–vis measurements show that their optical band gaps are highly tunable by varying the organic cations, MI ion, and MIII ion. Magnetic susceptibility measurements suggest an antiferromagnetic coupling between the nearest FeIII–FeIII, where the Curie–Weiss temperature, Néel temperature, and frustration factors can be easily modulated with their compositions and dimensionality. Our study demonstrates the rich and interesting magnetic properties in these layered transition-metal–halide double perovskites and paves the way for design of multifunctional magnetic materials.
研究领域:
材料科学
·
凝聚态物理
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2019
·Vol. 645
·期 23
·1341-1348
·
IF 1.337
Xiong He,Fang Chen,Dan Zhang,Yan Li,Hong-Li Yang,Xiu-Qing Zhang
Based on an asymmetric 1,2,4-benzenetricarboxylic acid (H 3 btc) and 2,2′-bipyridine (bpy), a new Cu II complex, Cu 2 (H 2 btc) 4 (bpy) 2 · 8H 2 O ( 1 ), was synthesized and structurally characterized by single-crystal X-ray diffraction, hirshfeld surface (HS) analysis, IR spectroscopy, powder X-ray analysis, thermal gravimetry analysis (TGA), magnetic susceptibility, EPR measurement, and UV/Vis spectrometry. Complex 1 shows a dinuclear copper structure. The Cu II of each dinuclear moiety are in a slightly distorted square-pyramidal environments. Magnetic susceptibility of 1 shows a ferromagnetic coupling between both metal atoms. The interaction of 1 with bovine serum albumin (BSA) is investigated using UV/Vis, fluorescence spectroscopic methods. The Cu II complex shows strong binding propensity in albumin binding study.
研究领域:
无机化学
·
材料科学
·
生物物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Qiang Zhao,Han Peng,He-zhen Wang,Shu-ran Gao,Jun-zhao Wang,Lin-Xi Qin,Meng-ting Fan
In order to better study the properties of rare earth complexes in terms of fluorescence, magnetism, and fluorescent probes, in this work, 5-(2-carboxyphenoxy)isophthalic acid (H 3 ocpia) and rare metal ions Eu 3+ , Tb 3+ , Dy 3+ were used to synthetic metal complexes by solvothermal reaction. Then three complexes Eu(ocpia) (1) , Tb(ocpia) (2) and Dy(ocpia) (3) were synthesized, their structural formulas are as follows: EuC 15 H 7 O 7, TbC 15 H 7 O 7 and DyC 15 H 7 O 7 . Data on the structure acquired via an X - ray single - crystal diffractometer indicates that complexes 1, 2 , and 3 possess the same spatial structures. They are two-dimensional planar structures with undulating ripples. Moreover, solid - state fluorescence tests were carried out on complexes H 3 ocpia, 1 , and 2 , and magnetic property tests were done on complexes 2 and 3 . Fluorescence recognition studies were conducted on complexes 1 and 2 in dispersed systems. The solid-state fluorescence results show that complexes 1 and 2 have excellent fluorescence properties, with higher fluorescence intensity than the ligand. The CIE chromaticity coordinates of complexes 1 and 2 are (0.59, 0.34) and (0.33, 0.62), respectively, and exhibit bright characteristic lights of europium and terbium under fluorescent lamps. Magnetic susceptibility measurements reveal that compounds 2 and 3 exhibit antiferromagnetic coupling behavior between adjacent metal centers. Fluorescence recognition studies have shown that complexes 1 and 2 exhibit good recognition of acetone in dispersed systems, the detection thresholds were determined to be 0.063 vol.% for complex 1 and 0.136 vol.% for complex 2 .
研究领域:
无机化学
·
配位化学
·
材料科学
·
荧光光谱学
·
磁性材料
·
传感器技术
·
晶体学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）