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Magnetic relaxation behavior of a spatially closed dysprosium(Ⅲ) phthalocyaninato double-decker complex

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Science China Chemistry 2012年第6期55卷 918-925,1178-1184页

作者： KATOH Keiichi UMETSU Kaori BREEDLOVE BRIAN K. YAMASHITA Masahiro Department of Chemistry Graduate School of Science Tohoku University 6-3 Aramaki-Aza-Aoba Aoba-ku Sendai Miyagi 980-8578 Japan

The SMM properties of the spatially closed Dy（Ⅲ） double-decker Pc complex Dy（obPc）2 （1）, which is equivalent to a pseudo dinuclear complex, are reported. Complex 1 crystallized with ethanol in the crystal lattice in the monoclinic space group P22/n and was isomorphous with Tb（obPc）2 （3）, which is arranged in a dimer structure along the b axis. The intermetallic Dy-Dy distance was determined to be 0.756 nm. ZMT versus T plots for 1 decreased with a decrease in T, which suggests the existence of an antiferromagnetic （AF） interaction between the Dy3＋ ions. The M-H curve for 1 at 1.8 K showed magnetic hysteresis. In ac susceptibility measurements on a powder sample of 1, which were dependent on the applied ac field, indicating that 1 is an single molecule magnet （SMM）, a maximum appeared at 22 K at an ac frequency 09 of 1488 Hz. The shape of the peaks dras- tically changed, and the peaks did not shift when an Hd~ large enough to suppress the quantum tunneling of the magnetization （QTM） was applied. The energy barrier （A/hc） was estimated to be 44 cm-1 with a pre-exponential factor （r0） of 1.6 × 10-5 s from an Arrhenius plot. Our results suggest that the SMM/magnetic properties of 1 significantly change in a dc magnetic field. These relaxation mechanisms are related to the energy gap of the ground state and to QTM.

关键词： single-molecule magnets dysprosium double-decker complex pseudo dinuclear complex magnetic relaxation process

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Crystal Structure of Bis｛1-(2-methoxyethyl)indenyl｝dysprosium Chloride

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Chinese Journal of Structural Chemistry 2000年第4期19卷 253-258页

作者： XIE Mei Hua ② HAO Xue Shi MA Huai Zhu (Institute of Organic Chemistry, Anhui Normal University, Wuhu Anhui 241000) WU Qiang Jin HUANG Zi Xiang (Fujian Institute of Research on the Structure of Matter, the Chinese Academy of Sciences, 安徽师范大学安徽芜湖 2 41 0 0 0 中科院福建物质结构所福建福州 350 0 0 2

The title complex bis｛1 (2 methoxyethyl)indenyl｝dysprosium chloride ((CH 3OCH 2CH 2C 9H 6) 2DyCl, M r =544.42) crystallizes in the triclinic,space group P 1(No.2) with unit cell parameters a = 10.326(1), b = 10.591(1), c = 20.256(3) , α = 91.543(9), β = 97.69(1), γ = 94.754(9)°, V=2186.2(9)  3, Z = 4, F(000)=1076, D C= 1.65g/cm 3, μ =35.87cm -1, R =0.042 and R w =0.051 for 6193 observed reflections with I>3σ(I ). X ray crystal structure study shows there are two crystallographically independent molecules A and B (A=(CH 3OCH 2CH 2C 9H 6) 2 Dy(1) Cl, B=(CH 3OCH 2CH 2C 9H 6) 2Dy(2)Cl) in an asymmetric unit of the title complex. Each molecule was unsolvated monomeric molecule with a trans arrangement of both the sidearms and indenyl rings.

关键词： methoxyethyl)indenyl ligand dysprosium crystal structure.

Expanded Porphyrin Exhibiting Off-Centered Out-of-Plane Coordination to dysprosium

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CCS Chemistry 2024年第7期6卷 1731-1738页

作者： Dmitry I.Nazarov Jorge Labella Alexey V.Kuzmin Maxim A.Faraonov Evgenii N.Ivanov Salavat S.Khasanov Tomas Torres Mikhail K.Islyaikin Dmitri V.Konarev Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS 142432 Chernogolovka Department of Organic Chemistry Universidad Autonoma de Madrid28049 Madrid Institute of Solid-State Physics RAS 142432 Chernogolovka Research Institute of Macroheterocycles Ivanovo State University of Chemistry and Technology15300 Ivanovo G.A.Krestov Institute of Solution Chemistry of the Russian Academy of Sciences 153045 Ivanovo Institute for Advanced Research in Chemical Sciences Universidad Autonoma de Madrid28049 Madrid IMDEA-Nanociencia 28049 Madrid

The complexation of high-spin lanthanides to porphyrinoids is a powerful strategy for the development of advanced molecular *** this context,the use of expanded porphyrinoids remains elusive since their coordination chemistry is challenging to ***,taking inspiration from on-surface chemistry,we explored the coordination of Dy^(3+)to a six-membered porphyrinoid,namely,the hemihexaphyrazine ***,we observed the selective formation of a mono-nuclear off-centered,out-of-plane H_(2)Hhp-Dy^(3+)complex when performing the complexation under reductive *** this reaction,the oxidation state of the macrocycle did not *** X-ray diffraction analysis,we found that the coordination number of Dy in this complex was *** macrocycle cocrystallized with decamethylcobaltocene(Cp_(2)^(*)Co)molecules,giving rise to a wellordered solid-state packing,governed byπ-π*** a result of this organization,a small magnetic coupling between the neighboring molecules was *** in all,this work provides key insights into the coordination of magnetically active metals with expanded porphyrinoids,thus motivating the development of advanced spintronic devices.

关键词： porphyrins dysprosium macrocycle coordination chemistry magnetism

Tuning Magnetic Relaxation in Square-Pyramidal dysprosium Single-Molecule Magnets Using Apical Alkoxide Ligands

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CCS Chemistry 2021年第12期3卷 388-398页

作者： Zhenhua Zhu Yi-Quan Zhang Xiao-Lei Li Mei Guo Jingjing Lu Shuting Liu Richard A.Layfield Jinkui Tang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022 University of Chinese Academy of Sciences Beijing 100049 Jiangsu Key Lab for NSLSCS School of Physical Science and TechnologyNanjing Normal UniversityNanjing 210023 University of Science and Technology of China Hefei 230026 Department of Chemistry School of Life SciencesUniversity of SussexBrighton BN19QR

Eight square-pyramidal dysprosium complexes of the type[Dy(X)(DBP)_(2){TMG(H)}_(2)]were synthesized,where TMG(H)denotes 1,1,3,3-tetramethylguanidine,X denotes an alkoxide ligand or anionic guanidinate in the apical position,and DBP denotes 2,*** complexes,expressed as 5-Dy-X,are single-molecule magnets(SMMs)with properties dependent on the nature of the apical X ligand.

关键词： single-molecule magnets dysprosium magnetic relaxation energy barrier twocoordination design

The Electroreduction of Gadolinium and dysprosium Ions in Equimolar NaCl-KCl Melt

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American Journal of Analytical Chemistry 2013年第6期4卷 39-46页

作者： Hasbi B. Kushkhov Aziza S. Uzdenova Mahmoud M. A. Saleh Abdalkader M. F. Qahtan Lily A. Uzdenova Kabardino-Balkarian State University Nalchik Russia

The mechanism of rare earth metals (Gd and Dy) chloride complexes electroreduction on the tungsten electrode in equimolar NaCl-KCl melt at 973 K has been studied by linear and cyclic voltammetry. Some kinetic parameters of processes were calculated. It was shown that the tungsten electrode was indifferent to gadolinium and dysprosium which were reduced on the surface. We found that the discharge mechanism of gadolinium and dysprosium chloride complexes was described by three-electron step when the steady-state conditions of polarization were limited by the mass transfer stage. The conditions of nonstationary polarization made the slowness of the charge transfer stage. The diffusion coefficient of gadolinium and dysprosium ions was calculated, the diffusion coefficient of GdCl3-6 ions was (0.9 ± 0.2) × 10-5 cm2.s-1, and for DYCI3-6 ions, it was (1.60 ± 0.2) × 10-5 сm2.s-1.

关键词： Molten Chlorides Gadolinium Trichloride dysprosium Trichloride The Electroreduction Mechanism Tungsten Electrode Linear and Cyclic Voltammetry The Diffusion Coefficient

Ferromagnetic Calculation of Terbium dysprosium and Holmium with Polyhedron Electron Shell

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Journal of Modern Physics 2015年第13期6卷 1776-1780页

作者： Zilong Kong Wufangfa Computer Technology Service Department Guangzhou China

Based on the regular polyhedron model of multi-electronic atom combined with the Bohr hypothesis, the following supposition is put forward: the electron momentum multiplied by the inscribed sphere radius of edges of each regular polyhedron is equal to the Planck constant. The relationship between saturation magnetization rates and Planck constants is determined, and the ferromagnetism of atoms is obtained from regular dodecahedron and regular hexahedron. Then, terbium, dysprosium, and holmium saturation magnetization rate are obtained from electronic regular polyhedron configuration. Derivation of matter wave formula is from thermodynamics, avoiding over speed of light.

关键词： Atomic Structure Regular Polyhedron Electron Shell Ferromagnetism of Terbium dysprosium and Holmium Matter Wave Formula

The First mixed(phthalocyaninato)(corrolato) dysprosium Triple-decker complex

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The First mixed(phthalocyaninato)(corrolato) dysprosium Trip...

Microstructure and properties of W-4.9Ni-2.1Fe heavy alloy with Dy2O3 addition

中国化学会第四届卟啉与酞菁学术研讨会

作者： Guifen Lu Cheng He Kang Wang Junshan Sun Sen Yan Zhongping Ou Weihua Zhu School of Chemistry and Chemical Engineering Jiangsu University Department of Chemistry University of Science and Technology Beijing College of Chemistry and Chemical Engineering TaiShan University

Recently,many groups devoted themselves to enrich "periodic table of corrole complexes".However,until now,there are only 42 kinds of elements,which can be coordinated with corrole ***,corrole complexes with rare earth metal ions are extremely *** the present paper,two triple-decker dinuclear sandwich dysprosium complexes which are represented as Dy[Pc(OCH)][Cor(FPh)] and Dy[Pc(OCH)][Cor(ClPh)] have been synthesized and reported as the first example of dysprosium corrole *** molecular structure was characterized by single-crystal X-ray diffraction and showed each dyprosium ion to be octa-coordinated by the isoindole and pyrrole nitrogen atoms of an outer phthalocyanine ring and the central corrole ring,respectively.

关键词： corrole phthalocyanine dysprosium

来源： cnki会议评论

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Rare Metals 2019年第8期38卷 746-753页

作者： Yuan-Feng Xie Liang-Liang Zhou Xiao-Yong Zhang Xiao-Xian Li Zeng-Lin Zhou Xue-Hui Zhang Institute of Engineering and Technology General Research Institute for Nonferrous Metals Beijing 100088China School of Materials Science and Engineering Jiangxi University of Science and Technology Ganzhou 341000China

The W-4.9 Ni-2.1 Fe-xDy2 O3 heavy alloy was fabricated by high-energy ball milling and spark plasma sintering(SPS)technique,and the microstructure,mechanical and friction behavior and anti-corrosion ability were investigated by scanning electron microscope(SEM),Rockwell hardness tester,X-ray diffraction(XRD),reciprocating friction and wear tester,electrochemical station,*** results show that the trace Dy2 O3 particles,which mainly distributes in the W-M(tungsten-matrix)interface and the tungsten matrix phase,can dramatically decrease the tungsten grain size and the amount of O and P impurities aggregating in the interface,promote the γ-(Ni,Fe)bonding phase and tungsten particles uniform distribution,and increase the relative density,hardness,and wear and corrosion resistance *** the excessive Dy2 O3 addition can make the inhibition effect weaken,resulting in the decrease in the comprehensive performances of the ***,the amount of Dy2 O3 should be *** the adding amount of Dy2 O3 particles is 0.7 wt%,the comprehensive performances of the heavy alloy are the best.

关键词： dysprosium oxide W-4.9Ni-2.1Fe alloy Spark plasma sintering Mechanical property Anticorrosion ability

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Investigation of Pt-Dy co-doping effects on isothermal oxidation behavior of (Co,Ni)-based alloy

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Journal of Rare Earths 2012年第9期30卷 928-933页

作者：兰昊张伟刚杨志刚 State Key Laboratory of Multi-phase Complex Systems Institute of Process EngineeringChinese Academy of Sciences State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and EngineeringTsinghua University

A Co32Ni21Cr8Al0.6Y （wt.%） alloy with and without doping 3 wt.% platinum, or co-doping 3 wt.% platinum and 0.1 wt.% dys- prosium was produced by arc melting. The hardness of both base alloy and composition-modified alloy was measured by using a Vickers hardness tester. Isothermal oxidation tests at 1000 ℃ in static air atmosphere were conducted to assess the isothermal oxidation behavior of the alloys. The microstructure and composition of the tested alloys before and after oxidation were investigated by means of X-ray diffraction （XRD）, field emission-scanning electron microscopy （FE-SEM） equipped with energy dispersive spectroscopy （EDS） and back scatter detec- tor. Results showed that platinum had significant influence on microstructure of the tested alloy by the formation of β-（Ni,Pt）AI phase. Addi- tion of 3 wt.% platinum could slightly increase the hardness of the tested alloy. Platinum accelerated phase transformation of alumina from metastable θ-Al2O3 to stable α-Al2O3 and suppressed the consumption of 13-phase. Co-doping both 3 wt.% platinum and 0.1 wt.% dysprosium induced the fastest transformation of θ- to α- alumina and the formation of a fine-grained oxide scales. The most effective reduction of oxida- tion rate was achieved by the Pt-Dy co-doping effects.

关键词： alloy oxidation platinum dysprosium rare earths

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