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Featured researches published by Xiao-Jun Zhao.


Inorganic Chemistry | 2017

Magnetic Relaxation Dynamics of a Centrosymmetric Dy2 Single-Molecule Magnet Triggered by Magnetic-Site Dilution and External Magnetic Field

Hui-Ming Dong; Hai-Yan Li; Yi-Quan Zhang; En-Cui Yang; Xiao-Jun Zhao

A centrosymmetric Dy2 single-molecule magnet (SMM) and its doped diamagnetic yttrium analogues, Dy0.19Y1.81 and Dy0.10Y1.90, were solvothermally synthesized to investigate the effects of intramolecular exchange coupling and quantum tunneling of magnetization (QTM) on the magnetic relaxation dynamics. Constructed from two hula-hoop-like DyIII ions and a pair of phenoxido groups, the antiferromagnetically coupled Dy2 exhibits a thermal-activated zero-field effective energy barrier (Ueff) of 277.7 K and negligible hysteresis loop at 2.0 K. The doping of a diamagnetic YIII matrix with 90.5% and 95.0% molar ratios reveals the single-ion origin of the Orbach channel, increases the relaxation time by partially quenching the QTM process, and induces an open hysteresis loop until 5.0 K. In contrast, an optimal dc field of 1.0 kOe improves the barrier height up to 290.1 K through complete elimination of the QTM and delays the relaxation time of the direct relaxation pathway. More interestingly, the collaborative dual effects of magnetic-site dilution and external magnetic field make the effective energy barrier and relaxation time increase 8.1% and 49 times, respectively. Thus, the overall magnetization dynamics of the Dy2 system systematically elaborate the inherent interplay of the QTM and Orbach processes on the effective energy barrier, highlighting the vital role of the relaxation time on the coercive hysteresis loop.


Inorganic Chemistry | 2017

A Rare Water and Hydroxyl-Extended One-Dimensional Dysprosium(III) Chain and Its Magnetic Dilution Effect

Yan Li; Pu Zhao; Shan Zhang; Rui Li; Yi-Quan Zhang; En-Cui Yang; Xiao-Jun Zhao

A novel water and hydroxyl-extended one-dimensional dysprosium(III) chain was hydrothermally obtained, which exhibits a relatively high spin-reversal energy barrier of 88.7 K and intrachain ferromagnetic interaction with the coupling constant Jexch = 3.04 cm-1 calculated by fitting magnetic susceptibilities using POLY_ANISO program based on ab initio calculations. To deeply understand the respective role of the single-ion anisotropy and intrachain exchange on the effective energy barrier, three crystallographically isostructural analogues containing isotropic Gd(III)-, diamagnetic Y(III)-, as well as Y(III)-doped Dy0.05Y0.95 were prepared and characterized structurally and magnetically. Due to the absence of significant intrachain exchange interaction, the effective energy barrier of the Dy0.05Y0.95 decreased by 9.9 K as compared with that of parent dysprosium(III) chain. Thus, it can be concluded that the intrachain ferromagnetic coupling and the magnetic anisotropy of the Dy(III) ion synergistically enhance the effective energy barrier of the dysprosium(III) chain, in which the single-ion anisotropy becomes more predominant.


European Journal of Inorganic Chemistry | 2005

Towards the Design of Linear Homo‐Trinuclear Metal Complexes Based on a New Phenol‐Functionalised Diazamesocyclic Ligand: Structural Analysis and Magnetism

Miao Du; Xiao-Jun Zhao; Jian-Hua Guo; Xian-He Bu; Joan Ribas


Journal of Molecular Structure | 2004

Formation of cobalt(II)–piperazine supramolecular systems under different organic acid mediums: synthesis, characterization and crystal structures

Xiao-Jun Zhao; Miao Du; Ying Wang; Xian-He Bu


Dalton Transactions | 2016

A novel oxime-derived 3d–4f single-molecule magnet exhibiting two single-ion magnetic relaxations

Hui-Ming Dong; Yan Li; Zhong-Yi Liu; En-Cui Yang; Xiao-Jun Zhao


Chemistry: A European Journal | 2016

Fine Tuning of the Anisotropy Barrier by Ligand Substitution Observed in Linear {Dy2Ni2} Clusters

Yan Li; Qiu Shang; Yi-Quan Zhang; En-Cui Yang; Xiao-Jun Zhao


Journal of Molecular Structure | 2004

Preparation, spectra and crystal structure of a novel NiII complex with a new oxime-functionalized diazamesocyclic ligand

Xiao-Jun Zhao; Miao Du; Ying Wang; Xian-He Bu


Inorganica Chimica Acta | 2005

Oxime-functionalized diazamesocyclic derivates and their metal complexes: Effect of the ligand backbones and anions on the generation of novel monomeric and mono-μ-Cl dimeric CuII complexes

Xiao-Jun Zhao; Miao Du; Ying Wang; Jian-Hua Guo; Xian-He Bu


Inorganica Chimica Acta | 2016

Transition metal ion-directed magnetic behaviors observed in an isostructural heterobinuclear system

Yan Li; Chao Zhang; Jia-Wen Yu; En-Cui Yang; Xiao-Jun Zhao


Journal of Molecular Structure | 2019

Three bulky conjugated 4-(2,6-di(pyrazin-2-yl)pyridin-4-yl)benzoate-based chains exhibiting dual photocatalytic and electrocatalytic performances

Rui Hao; Lei Li; Shuang Zhu; Zhi-Hong Wang; Xiao-Jun Zhao; En-Cui Yang

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En-Cui Yang

Tianjin Normal University

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Miao Du

Zhengzhou University of Light Industry

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Rui Hao

Tianjin Normal University

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Shuang Zhu

Tianjin Normal University

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Yan Li

Tianjin Normal University

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Yi-Quan Zhang

Nanjing Normal University

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Ying Wang

Tianjin Normal University

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