Two tetranuclear lanthanide complexes respectively featuring magnetocaloric effect and slow magnetization relaxation

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Structure Pub Date : 2025-02-22 DOI:10.1016/j.molstruc.2025.141750

Ming Fang, Ya-Ru Dang, Mei-Hui Ma, Run-Yan Shao, Ya-Hui Luan, Zhen-Huan Tang, Ying-Hao Ma, Bao-Xiang Shi

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Abstract

Two parallelogram-shape tetranuclear rare earth compounds, having the molecular formula {[Ln₄(L)₂(acac)₄(Hthma)₂]·2CH₃OH·4CH₃CN} (Ln = Gd (1), Dy (2); H₂L = N'-(2‑hydroxy-5-methylbenzylidene)-6-(hydroxymethyl) picolinohydrazide, acac = acetylacetone, H₃thma = 1,1,1-tris(hydroxymethyl)methylamine), were constructed and structurally characterized. The [Ln₄O₈] core of compounds 1 and 2 are connected collectively by means of two µ₂ carbonyl O atoms derived from L²⁻ main ligands, two μ₃ as well as two μ₂ hydroxyl O atoms originated from two Hthma²⁻ and two µ₂ O atoms from two acac⁻. Magnetic research concluded that 1 displays magnetocaloric effect (−ΔS_m = 29.91 J K⁻¹ kg⁻¹) and 2 displays extremely weak antiferromagnetic interaction among neighboring rare earth ions. Single molecule magnet behaviors were possibly detected in 2, however no characteristic maximum was reached above 2 K.

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.