Yao Xu, Yan Pengfei, An Guanghui, Li Yuxin, Li Weizuo, Li Guangming
Key Laboratory of Functional Inorganic Material Chemistry (MOE); School of Chemistry and Materials Science; Heilongjiang University, No. 74, Xuefu Road, Nangang District, Harbin, 150080, People's Republic of China.
Dalton Trans. 2018 Mar 12;47(11):3976-3984. doi: 10.1039/c7dt04764a.
A series of four β-diketone mononuclear Dy(iii) complexes, namely Dy(Hthd)(MeOH)·2,5-Py (1), Dy(Hthd)(Tppo) (2), Dy(Hthd)(PyNO) (3), and Dy(Hthd)(4-PyNO) (4) (Hthd = 2,2,6,6-tetramethyl-3,5-heptanedione, 2,5-Py = 2,5-pyridine, Tppo = triphenylphosphine oxide, PyNO = pyridine N-oxide, 4-PyNO = 4-methylpyridine N-oxide), have been isolated by reactions of Hthd, DyCl·6HO and an auxiliary ligand. X-ray crystallographic analysis revealed that complexes 1-4 are all seven-coordinated mononuclear structures with C or C local symmetry. The magnetic measurements of complexes 1-4 revealed their field-induced single-ion magnet (SIM) behavior, due to mixed low-lying states. The crystal field parameters and orientations of the magnetic easy axes were obtained from simulations of the DC magnetic data and an electrostatic model calculation. The magneto-structural correlation of seven-coordinated Dy(iii) SIMs with low-symmetry coordination environments was further discussed.
通过2,2,6,6-四甲基-3,5-庚二酮（Hthd）、DyCl₃·6H₂O与辅助配体反应，分离得到了一系列四个β-二酮单核Dy(iii)配合物，即Dy(Hthd)(MeOH)·2,5-Py (1)、Dy(Hthd)(Tppo) (2)、Dy(Hthd)(PyNO) (3)和Dy(Hthd)(4-PyNO) (4)（2,5-Py = 2,5-吡啶，Tppo = 三苯基氧化膦，PyNO = 吡啶N-氧化物，4-PyNO = 4-甲基吡啶N-氧化物）。X射线晶体学分析表明，配合物1-4均为具有C₃或C₃ᵥ局部对称性的七配位单核结构。配合物1-4的磁性测量表明，由于存在混合的低能态，它们具有场诱导单离子磁体（SIM）行为。通过对直流磁性数据的模拟和静电模型计算，获得了晶体场参数和磁易轴的取向。进一步讨论了具有低对称配位环境的七配位Dy(iii) SIMs的磁结构相关性。
