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Seeking magneto-structural correlations in easily tailored pentagonal bipyramid Dy (Ⅲ) single-ion magnets

Science China Chemistry 2020年第8期63卷 1066-1074页

作者： Guo-Zhang Huang Ze-Yu Ruan Jie-Yu Zheng Yan-Cong Chen Si-Guo Wu Jun-Liang Liu Ming-Liang Tong Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistrySun Yat-Sen UniversityGuangzhou 510275China

Controlling molecular magnetic anisotropy via structural engineering is delicate and fascinating,especially for single-molecule magnets(SMMs).Herein a family of dysprosium single-ion magnets(SIMs)sitting in pentagonal bipyramid geometry have been synthesized with the variable-size terminal ligands and counter anions,through which the subtle coordination geometry of Dy(Ⅲ)can be finely tuned based on the size *** effective energy barrier(Ueff)successfully increases from 439 to 632 K and the magnetic hysteresis temperature(under a 200 Oe/s sweep rate)raises from 11 to 24 *** on the crystal-field theory,a semi-quantitative magneto-structural correlation deduced experimentally for the first time is revealed that the Ueff is linearly proportional to the structural-related value S20 corresponding to the axial coordination bond lengths and the bond *** the evaluation of the remanent magnetization from hysteresis,quantum tunneling of magnetization(QTM)is found to exhibit negative correlation with the structural-related value Stun corresponding to the axial coordination bond angles.

关键词： single-molecule magnets magnetic anisotropy crystal field magneto-structural correlation

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A Double Azole-bridged Dinuclear Copper(Ⅱ) Complex Containing 4-Pyridyl-NH-1,2,3-triazoles: Synthesis, Structure and Magnetism

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Chinese Journal of structural Chemistry 2020年第5期39卷 918-926页

作者： ZHANG Xin JIANG Xiao-Feng CHEN Yun-Zhou CHEN Yun-Feng DING Li-Li JIA Li-Hui Key Laboratory for Green Chemistry Process of Ministry of Education School of Chemistry and Environmental EngineeringWuhan Institute of TechnologyWuhan 430073China Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Function Molecules Hubei UniversityWuhan 430062China

A new dinuclear copper(Ⅱ)compound[Cu2(CH3COO)2(L)2(H2O)2]·4H2O(1,HL=4-pyridyl-NH-1,2,3-triazole)has been synthesized and ***-crystal X-ray diffraction showed that complex 1 crystallizes in monoclinic space group P21/c with a=0.8427(1),b=1.0981(1),c=1.3610(1)nm,β=93.364(4)°,V=1.2573(1)nm^3,Mr=643.56,Z=2,Dc=1.700 g/cm^3,μ=1.760 mm-1,R=0.0376,wR=0.0981,and possesses a planar Cu2N4 six-membered ring,in which both Cu(Ⅱ)ions are bridged by two 1,2,3-triazole *** neighboring dinuclear molecules are bound by strong intermolecular hydrogen bonds to create 1-D chains expanding along the b axis,which further form a 3-D supramolecular *** susceptibility measurement indicated the presence of weak antiferromagnetic interactions within the *** best fit using spin Hamiltonian yields the magnetic coupling constant J=–14.82 cm^-1 above 30 *** magnetic data are compared to those obtained for related double diazine bridged dinuclear copper(Ⅱ)complexes and magnetostructural correlations are discussed.

关键词： dinuclear Cu(Ⅱ)complexes 4-pyridyl-NH-1,2,3-triazole magnetic properties magneto-structural correlation

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Crystal Structures and Magnetic Studies of Naphthalene Derivatives Containing Nitronyl Nitroxides

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Chinese Journal of Chemistry 2003年第5期21卷 485-490页

作者：张德清朱洪庆丁亮徐伟刘伟朱道本 Organic Solids Laboratory Center for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

Crystal structures of new nitronyl nitroxide derivatives 1, 2 and 3 were determined with X-ray diffraction analysis: 1, monoclinic, C-2/c, a = 1.204 (5) nm; b = 0.9730 (5) nm, c = 2.7049 (10) nm, beta = 98.189 (15)degrees, V = 3.2315 (24) nm(3), Z = 8; 2, orthorhombic, Pbca, a = 0.61262(2) nm, b = 1.11426(6) nm, c = 2.30543(13) nm, V = 1.57373(13) nm(3), Z = 4; 3, monoclinic, P2(1)/n, a = 0.64253(4) nm, b = 2.55003(17) nm, c = 1.15497(6) nm, beta = 95.000(3)degrees, V = 1.8852(2) nm(3), Z = 4. Their magnetic properties were measured with SQUID and analyzed based on their crystal structures with simple singlet-triplet, modified one dimensional antiferromagnetic chain and modified singlet-triplet models respectively: 1, J/k(b) = -2.5 K; 2, J/k(b) = 7.8 K, theta = 2.8 K; 3, J/k(b) = -0.96 K, theta = 0.21 K.

关键词： nitronyl nitroxide naphthalene magneto-structural correlation

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Magnetic Interactions Switching in Two Dinuclear Dy（Ⅲ） Single-Molecule Magnets via Subtle structural Distortion

Magnetic Interactions Switching in Two Dinuclear Dy（Ⅲ） Si...

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中国化学会第九届全国无机化学学术会议

作者： Kun Zhang Yao-Yu Wang Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education Shaanxi Key Laboratory of Physico-Inorganic ChemistryCollege of Chemistry ＆ Materials ScienceNorthwest University

In the field of coordination and supramolecular chemistry,lanthanide complexes have attracted intense interest of scientists over recent years for their interesting optical and magnetic *** particular,numerous experimental and theoretical studies on lanthanide coordination complexes have been explored since Ishikawa et *** a terbium phthalocyanine complex which could exhibit single-molecule magnet（SMM）*** discrete molecules can retain spin information over long periods of time and behave like nanoscopic classical magnets at low temperature,suggesting possible applications in molecular spintronics,ultra-high density information storage and quantum information processing.1The study for structure-property relationship is the eternal theme of modern *** whose goals are the design of new matters exhibiting desired physical or chemical properties,rather than only being satisfied with creating new *** recent years,the detailed analysis of the correlation between structure and magnetic properties has been established for transition metal clusters,by contrast,the study of magneto-structural correlation for lanthanide complexes is a close blank *** is mainly due to the fact that,ferromagnetically coupled polynuclear lanthanide complexes are extremely rare,and no suitable models are supported.2In this work,we have structurally and magnetically characterized two dinuclear dysprosium complexes,1and 2（Fig.1）.The two complexes display only small structural variations for the geometry of{Dy2O2}cores but remarkably different magnetic *** slight variations for the ligands but same coordination atoms lead a change from antiferromagnetic to ferromagnetic interactions in those two *** current susceptibilities reveal that both of them exhibit single-molecule magnet *** two centrosymmetric{Dy2}complexes support ideal models to elucidate the magneto-structural correlation for lanthanide comple

关键词： Dysprosium Fine-Tuning magneto-structural correlation Single-Molecule Magnets

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