Investigation of Gd(III) 2D Metal–Organic Frameworks for Magnetic Refrigeration

IF 4.7 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Pub Date : 2025-07-05 DOI:10.1021/acs.inorgchem.5c02306

Dipanti Borah, Nareshwararajan B. Sankarammal, Himani Goyal, Sanjog S. Nagarkar* and Maheswaran Shanmugam*,

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Abstract

The reaction between isophthalic acid (H₂L₁) and Gd(NO₃)₃·6H₂O leads to the formation of a two-dimensional (2D) extended framework with the molecular formula [Gd₂(L₁)₃(H₂O)₂]_n (1). Complex 1 crystallizes in monoclinic space group P2₁/n. The compound undergoes a reversible crystalline-to-amorphous phase transition. Magnetic susceptibility measurements on a polycrystalline sample of 1 reveal a weak ferromagnetic interaction between the Gd(III) centers below 20 K. Analysis of the magnetic data using the Fisher chain model indicates an exchange interaction strength (J) of +0.06 cm^–1. A significant magnetic entropy change (−ΔS_m) of 39.4 J kg^–1 K^–1 at 2.0 K and 9 T was observed, derived from detailed magnetization and heat capacity measurements on 1. The rate of change in the adiabatic temperature (ΔT_ad) was observed to be 2–3 K T^–1. Further, to infer the porosity within 1, a N₂ adsorption isotherm was conducted at 77 K, which indicates that the 2D sheets were held together strongly.

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磁性制冷用Gd（III）二维金属-有机骨架的研究

间苯二甲酸（H2L1）与Gd(NO3)3·6H2O反应形成分子式为[Gd2(L1)3(H2O)2]n(1)的二维（2D）扩展骨架。配合物1在单斜空间群P21/n中结晶。该化合物经历了可逆的结晶到非晶相变。对多晶样品1的磁化率测量表明，在20k以下，Gd（III）中心之间存在弱铁磁相互作用。利用Fisher链模型分析磁性数据表明，交换相互作用强度(J)为+0.06 cm-1。在2.0 K和9 T时，观察到显著的磁熵变化（-ΔSm）为39.4 J kg-1 K-1，这是由详细的磁化和热容测量得出的。绝热温度（ΔTad）的变化率为2-3 kt -1。此外，为了推断孔隙度在1以内，在77 K下进行了N2吸附等温线，这表明二维薄片牢固地结合在一起。

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来源期刊

Inorganic Chemistry 化学-无机化学与核化学

CiteScore

7.60

自引率

13.00%

发文量

1960

审稿时长

1.9 months

期刊介绍： Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.