Dipanti Borah, Nareshwararajan B. Sankarammal, Himani Goyal, Sanjog S. Nagarkar* and Maheswaran Shanmugam*,
{"title":"磁性制冷用Gd（III）二维金属-有机骨架的研究","authors":"Dipanti Borah, Nareshwararajan B. Sankarammal, Himani Goyal, Sanjog S. Nagarkar* and Maheswaran Shanmugam*, ","doi":"10.1021/acs.inorgchem.5c02306","DOIUrl":null,"url":null,"abstract":"<p >The reaction between isophthalic acid (H<sub>2</sub>L<sub>1</sub>) and Gd(NO<sub>3</sub>)<sub>3</sub>·6H<sub>2</sub>O leads to the formation of a two-dimensional (2D) extended framework with the molecular formula [Gd<sub>2</sub>(L<sub>1</sub>)<sub>3</sub>(H<sub>2</sub>O)<sub>2</sub>]<i><sub>n</sub></i> (<b>1</b>). Complex <b>1</b> crystallizes in monoclinic space group <i>P</i>2<sub>1</sub><i>/n</i>. The compound undergoes a reversible crystalline-to-amorphous phase transition. Magnetic susceptibility measurements on a polycrystalline sample of <b>1</b> 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 (<i>J</i>) of +0.06 cm<sup>–1</sup>. A significant magnetic entropy change (−Δ<i>S</i><sub>m</sub>) of 39.4 J kg<sup>–1</sup> K<sup>–1</sup> at 2.0 K and 9 T was observed, derived from detailed magnetization and heat capacity measurements on <b>1</b>. The rate of change in the adiabatic temperature (Δ<i>T</i><sub>ad</sub>) was observed to be 2–3 K T<sup>–1</sup>. Further, to infer the porosity within <b>1</b>, a N<sub>2</sub> adsorption isotherm was conducted at 77 K, which indicates that the 2D sheets were held together strongly.</p>","PeriodicalId":40,"journal":{"name":"Inorganic Chemistry","volume":"64 28","pages":"14651–14660"},"PeriodicalIF":4.7000,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Investigation of Gd(III) 2D Metal–Organic Frameworks for Magnetic Refrigeration\",\"authors\":\"Dipanti Borah, Nareshwararajan B. Sankarammal, Himani Goyal, Sanjog S. Nagarkar* and Maheswaran Shanmugam*, \",\"doi\":\"10.1021/acs.inorgchem.5c02306\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >The reaction between isophthalic acid (H<sub>2</sub>L<sub>1</sub>) and Gd(NO<sub>3</sub>)<sub>3</sub>·6H<sub>2</sub>O leads to the formation of a two-dimensional (2D) extended framework with the molecular formula [Gd<sub>2</sub>(L<sub>1</sub>)<sub>3</sub>(H<sub>2</sub>O)<sub>2</sub>]<i><sub>n</sub></i> (<b>1</b>). Complex <b>1</b> crystallizes in monoclinic space group <i>P</i>2<sub>1</sub><i>/n</i>. The compound undergoes a reversible crystalline-to-amorphous phase transition. Magnetic susceptibility measurements on a polycrystalline sample of <b>1</b> 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 (<i>J</i>) of +0.06 cm<sup>–1</sup>. A significant magnetic entropy change (−Δ<i>S</i><sub>m</sub>) of 39.4 J kg<sup>–1</sup> K<sup>–1</sup> at 2.0 K and 9 T was observed, derived from detailed magnetization and heat capacity measurements on <b>1</b>. The rate of change in the adiabatic temperature (Δ<i>T</i><sub>ad</sub>) was observed to be 2–3 K T<sup>–1</sup>. Further, to infer the porosity within <b>1</b>, a N<sub>2</sub> adsorption isotherm was conducted at 77 K, which indicates that the 2D sheets were held together strongly.</p>\",\"PeriodicalId\":40,\"journal\":{\"name\":\"Inorganic Chemistry\",\"volume\":\"64 28\",\"pages\":\"14651–14660\"},\"PeriodicalIF\":4.7000,\"publicationDate\":\"2025-07-05\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Inorganic Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acs.inorgchem.5c02306\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, INORGANIC & NUCLEAR\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Inorganic Chemistry","FirstCategoryId":"92","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.inorgchem.5c02306","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
Investigation of Gd(III) 2D Metal–Organic Frameworks for Magnetic Refrigeration
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 (−ΔSm) 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 (ΔTad) 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.
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.
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