【作者】 张宏刚； 杨华； 李大成； 窦建民；

【Author】 Honggang Zhang;Hua Yang;Dacheng Li;Jianmin Dou;Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University;

【机构】 山东省化学储能与新型电池技术重点实验室聊城大学化学化工学院；

【摘要】 羟肟酸配体含有多个N、O供体原子,其易与金属原子配位形成稳定的五元或六元螯合环,是构筑金属配合物的优良配体^[1-3]。我们以吡嗪羟肟酸（H₂pyzha）为配体,通过与三氟甲烷磺酸铜和三氟甲烷磺酸铽反应,在常温下自然挥发溶剂得到了一个15-MC-5金属冠醚{[Tb（H₂O）₃{Cu（pyzha）}₅（H₂O）₃]?3（TfO）?3（H₂O）?（Me OH）}（Fig.1）,并通过X-射线单晶衍射对其结构进行了表征。该配合物包括五个脱质子的配体、五个铜离子、六个水分子以及三个游离的水分子、一个游离的甲醇分子、三个游离的三氟甲烷磺酸根离子（Fi g.1,a）。我们对配合物进行了磁性测试,测试结果表明配合物表现出频率依赖的虚部交流信号,有慢弛豫现象（Fig.1,b）。这表明,配合物表现出类似单分子磁体行为。更多还原

【Abstract】 Hydroxamic acid ligands contain many N and O donor atoms.They are easy to coordinate with metal atoms to form stable five-member or six-member chelating rings,so they are excellent ligands to construct metal complexes^[1-3].Using pyrazinohydroxamic acid as ligand,a 15-MC-5 Metallacrown{[Tb（H₂O）₃{Cu（pyzha）}₅（H₂O）₃]?3（TfO）?3（H₂O）?（MeOH）}（Fig.1） was synthesized by reaction with Cu^II triflate and Tb^III triflate at room temperature,and its structure was characterized by X-ray single crystal diffraction.The complex consists of six deprotonated ligands,five Cu²⁺ions,one Tb³⁺ion,six H₂O molecules,one free methanol molecule,three free H₂O molecules and two three free triflate ions.The magnetic properties of the complex have been texted and we found that there was a frequency dependence acχ"_M signal with the H_dc=0 Oe.The slow relaxation of its magnetization shows that the complex exhibits single molecular magent-like behavior.更多还原