摘要
Two chelating guanidinate-based dysprosium(Ⅲ)complexes,namely the monomeric{(Me_(3)Si)_(2)NC(N^(i)Pr)_(2)}_(2)Dy(μ-CI)_(2)Li(THF)_(2) 1 and the dimeric[{(Me_(3)Si)_(2)NC(N^(i)Pr)_(2)}_(2)Dy(μ-CI)]_(2) 2,have been confirmed to be single-molecule magnets.Moreover,the alteration from 1 to 2 leads to an obvious mitigated quantum tunnelling of magnetization at zero field of the hysteresis loop and much enhanced magnetic relaxation barrier(up to 312 K).5%dilution with the yttrium(Ⅲ)analogue for 2 shows no clear change for the hysteresis,indicating the single-ion nature of the magnetic behavior.
基金
the Shenzhen Science and Technology Program(No.JCYJ20180306170859634)
the National Natural Science Foundation of China(Nos.21773130,21801202,21971203 and 21620102002)
the Key Scientific and Technological Innovation Team of Shaanxi Province(No.2020TD-001)
the Key Laboratory Construction Program of Xi’an Municipal Bureau of Science and Technology(No.201805056ZD7CG40)
the China Postdoctoral Science Foundation(Grants Nos.2019T120891,2017M623150 and 2018M643615)
the Postdoctoral Foundation of Shaanxi Province(Grant No.2018BSHEDZZ100)
the Shaanxi Postdoctoral Science Foundation(No.2017BSHTDZZ08)
the Fundamental Research Funds for Central Universities.We also thank the Instrument Analysis Center of Xi'an Jiaotong University for the measurement on dilution ratio and the University of Manchester for elemental analyses measurement.
