Synthesis, structure, and magnetic properties of heterometallic {Zn2Ln2} (Ln = Tb, Dy, Ho) compounds with parallelogram-like cores
作者： Wei-Wei Kuang , Yun Xu , Li-Li Zhu , Pei-Pei Yang
DOI: 10.1016/J.ICA.2015.07.026
关键词:
摘要: Abstract This work presents the synthesis, structure, and magnetic properties of three tetranuclear heterometallic compounds with chemical formula [Zn2Ln2(L)4Cl2]·xCH3CN·yCH3OH where Ln = Tb (1), Dy (2), Ho (3) H2L ligand was 1,2-bis(2-hydroxy-3-methoxybenzylidene) hydrazine. Single-crystal X-ray analyses revealed that 1–3 had similar coordination environments structures. Direct current susceptibility measurements χmT product decreased decreasing temperature due most likely to either thermal depopulation Stark sublevels TbIII, DyIII, HoIII ions or antiferromagnetic coupling within [Zn2Ln2] cores. Furthermore, compound 2 displayed a slow field-induced relaxation magnetization. An energy barrier ΔE/kB = 23.74 K pre-exponential factor τ0 = 4.33 × 10−6 s were obtained by fitting dynamic data an Arrhenius rate law.
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