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- Title
Two Oxime-Based { Ln<sup>III</sup><sub>3</sub>Ni<sup>II</sup><sub>3</sub>} Clusters with Triangular { Ln<sub>3</sub>(μ<sub>3</sub>-Ο<sub>2</sub>)}<sup>7+</sup> Core: Solvothermal Syntheses, Crystal Structures, and Magnetic Properties.
- Authors
Wang, Xiao‐Ting; Dong, Hui‐Ming; Wang, Xiu‐Guang; Yang, En‐Cui; Zhao, Xiao‐Jun
- Abstract
Two isostructural heterometallic complexes, {[Dy3Ni3(H2O)3(mpko)9(O2)(NO3)3](ClO4) ·3CH3OH ·3CH3CN} ( 1) and {[Gd3Ni3(H2O)3(mpko)9(O2)(NO3)3](NO3) ·10.75CH3OH} ( 2) [mpkoH = 1-(pyrazin-2-yl)ethanone oxime], were solvothermally synthesized by varying lanthanide ions with different magnetic anisotropy. Structural analyses revealed that both complexes contain a peroxide anion-aggregated triangular { Ln3(μ3-Ο2)}7+ core, which is surrounded by three NiII octahedra through threefold oxime linkages into a heterometallic hexanuclear cluster. Apparent antiferromagnetic interactions are observed between the adjacent spin carriers of 1 and 2 with the coupling constant J Ln ···Ni ≈ 12 J Ln ··· Ln. Additionally, 1 with highly anisotropic DyIII site shows slow magnetization relaxation under zero dc field and 2 constructed from isotropic GdIII ion displays significant cryogenic magnetocaloric effect with a maximum entropy change of 24.8 J ·kg-1 ·K-1 at 3.0 K and 70 kOe.
- Subjects
IMINES; METAL bonding; MAGNETIC anisotropy; RARE earth ions; MAGNETIC entropy
- Publication
Zeitschrift für Anorganische und Allgemeine Chemie, 2016, Vol 642, Issue 20, p1166
- ISSN
0044-2313
- Publication type
Article
- DOI
10.1002/zaac.201600253