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Boosting the proton conduction in a magnetic dysprosium-organic framework by introducing conjugate NH_(4)^(+)-NH_(3)pairs

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Chinese Chemical Letters 2024年第1期35卷 518-522页

作者： Yi-Ping Qu Qian Zou Song-Song Bao Li-Min Zheng State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical EngineeringCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China

Metal-organic frameworks(MOFs)with inherent porosity and suspended acidic groups are promising proton conducting materials in water or aqua-ammonia *** we report a new lanthanide phosphonate,namely,Dy_(2)(amp_(2)H_(2))_(2)(mal)(H_(2)O)_(2)·5H2O(MDAF-6).It possesses a 3D open-framework structure,and shows a high NH_(3)adsorption capacity of 142.4 cm^(3)/g at P/P0=0.98 at 298 K due to acid-base ***,the proton conductivity of MDAF-6-NH3 is enhanced by five orders of magnitude compared to MDAF-6 after 8.5 h exposure in saturated NH_(3)-H_(2)O vapor,indicating the importance of coexistent conjugate acid-base pairs of H_(3)O+-H_(2)O and NH_(4)^(+)-NH_(3)in promoting proton *** studies of MDAF-6 revealed slow magnetization relaxation under zero dc field,characteristic of singlemolecule magnet *** work provides not only a new multifunctional MOF material,but also a new strategy to improve proton conduction in aqua-ammonia medium.

关键词： Metal-organic framework Proton conduction Ammonia adsorption Metal phosphonate single molecule magnet

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Dephasing of quantum tunnelling in molecular nanomagnets

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Chinese Physics B 2008年第4期17卷 1436-1442页

作者：张树群陈芝得 Department of Optoelectronic Engineering Jinan University Department of Physics Jinan University

Dephasing mechanism of quantum tunnelling in molecular magnets has been studied by means of the spin-coherentstate path integral in a mean field approximation. It is found that the fluctuating uncompensated transverse field from the dipolar-dipolar interaction between molecular magnets contributes a random phase to the quantum interference phase. The resulting transition rate is determined by the average tunnel splitting over the random phase. Such a dephasing process leads to the suppression of quenching due to the quantum phase interference, and to the steps due to odd resonances in hysteresis loop survived, which is in good agreement with experimental observations in molecular nanomagnets Fes and Mn12.

关键词： single molecule magnet quantum tunnelling dephasing

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Thermo-induced structural transformation with synergistic optical and magnetic changes in ytterbium and erbium complexes

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Chinese Chemical Letters 2021年第4期32卷 1519-1522页

作者： Qian Zou Jing-Cui Liu Xin-Da Huang Song-Song Bao Li-Min Zheng State Key Laboratory of Coordination Chemistry Coordination Chemistry InstituteSchool of Chemistry and Chemical EngineeringCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China

Dinuclear ytterbium and erbium based bifunction complexes Ln_(2) L_(2)(depma_(2))Cl_(2)(1-Ln,Ln=Yb and Er,H_(2) L=N~1,N~3-bis(salicylideneimino)diethylenetriamine,depma_(2)=dimerized 9-diethyl-phosphonomethylanthracene)are *** undergo thermo-induced consecutive phase transitions,first the dissociation of depma_(2) ligand forming LnL(depma)Cl(2-Ln)and then the release of chloroethane forming LnL(epma)(3-Ln,epma=9-ethylphosphonomethylanthrancene).The structural transformations are accompanied with synergetic switch of the luminescence in visible and NIR regions and also magnetic dynamics.

关键词： Phase transition Lanthanide Anthracene single molecule magnet Luminescence

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Resonant tunnelling of the magnetization in molecular crystal of [（Mn1-xCrx）12O12 （CH3COO）16（H2O）4]·2CH3COOH·4H2O（x=0,0.03,0.04,0.05）

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Chinese Physics B 2007年第6期16卷 1776-1779页

作者：何光何伦华张俊荣曹慧波阎丽琴王芳卫严启伟 School of Physics & Electronic Engineering The Central University of Nationalities Beijing 100081 China State Key Laboratory for magnetism Institute of Physics Chinese Academy of Sciences Beijing 100080 China

The quantum tunnelling of magnetization （QTM） in single crystals of the single molecule magnet （Mn1-xCrx）12- Ac （x=0, 0.03, 0.04, 0.05） has been investigated. In comparison with its parent Mnl2-Ac, a greater rate of magnetization relaxation and a lower effective potential-energy barrier have been observed in Cr-doping samples. This modulation of QTM due to the Cr-doping could be attributed to the small change of Sz due to the smaller spin of Cr itself and additional intrinsic but distributed transverse and longitudinal anisotropy raised by a subtle change of the local environment in the magnetic Mn12 core.

关键词： quantum tunnelling of magnetization magnetization relaxation single molecule magnet

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