Ming Fang, Ya-Ru Dang, Mei-Hui Ma, Run-Yan Shao, Ya-Hui Luan, Zhen-Huan Tang, Ying-Hao Ma, Bao-Xiang Shi
{"title":"两种四核镧系配合物分别具有磁热效应和慢磁化弛豫","authors":"Ming Fang, Ya-Ru Dang, Mei-Hui Ma, Run-Yan Shao, Ya-Hui Luan, Zhen-Huan Tang, Ying-Hao Ma, Bao-Xiang Shi","doi":"10.1016/j.molstruc.2025.141750","DOIUrl":null,"url":null,"abstract":"<div><div>Two parallelogram-shape tetranuclear rare earth compounds, having the molecular formula {[Ln<sub>4</sub>(L)<sub>2</sub>(acac)<sub>4</sub>(Hthma)<sub>2</sub>]·2CH<sub>3</sub>OH·4CH<sub>3</sub>CN} (Ln = Gd (<strong>1</strong>), Dy (<strong>2</strong>); H<sub>2</sub>L = N'-(2‑hydroxy-5-methylbenzylidene)-6-(hydroxymethyl) picolinohydrazide, acac = acetylacetone, H<sub>3</sub>thma = 1,1,1-tris(hydroxymethyl)methylamine), were constructed and structurally characterized. The [Ln<sub>4</sub>O<sub>8</sub>] core of compounds <strong>1</strong> and <strong>2</strong> are connected collectively by means of two <em>µ</em><sub>2</sub> carbonyl O atoms derived from L<sup>2−</sup> main ligands, two <em>μ</em><sub>3</sub> as well as two <em>μ</em><sub>2</sub> hydroxyl O atoms originated from two Hthma<sup>2−</sup> and two <em>µ</em><sub>2</sub> O atoms from two acac<sup>−</sup>. Magnetic research concluded that <strong>1</strong> displays magnetocaloric effect (−<em>ΔS</em><sub>m</sub> = 29.91 J K<sup>−1</sup> kg<sup>−1</sup>) and <strong>2</strong> displays extremely weak antiferromagnetic interaction among neighboring rare earth ions. Single molecule magnet behaviors were possibly detected in <strong>2</strong>, however no characteristic maximum was reached above 2 K.</div></div>","PeriodicalId":16414,"journal":{"name":"Journal of Molecular Structure","volume":"1334 ","pages":"Article 141750"},"PeriodicalIF":4.7000,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Two tetranuclear lanthanide complexes respectively featuring magnetocaloric effect and slow magnetization relaxation\",\"authors\":\"Ming Fang, Ya-Ru Dang, Mei-Hui Ma, Run-Yan Shao, Ya-Hui Luan, Zhen-Huan Tang, Ying-Hao Ma, Bao-Xiang Shi\",\"doi\":\"10.1016/j.molstruc.2025.141750\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Two parallelogram-shape tetranuclear rare earth compounds, having the molecular formula {[Ln<sub>4</sub>(L)<sub>2</sub>(acac)<sub>4</sub>(Hthma)<sub>2</sub>]·2CH<sub>3</sub>OH·4CH<sub>3</sub>CN} (Ln = Gd (<strong>1</strong>), Dy (<strong>2</strong>); H<sub>2</sub>L = N'-(2‑hydroxy-5-methylbenzylidene)-6-(hydroxymethyl) picolinohydrazide, acac = acetylacetone, H<sub>3</sub>thma = 1,1,1-tris(hydroxymethyl)methylamine), were constructed and structurally characterized. The [Ln<sub>4</sub>O<sub>8</sub>] core of compounds <strong>1</strong> and <strong>2</strong> are connected collectively by means of two <em>µ</em><sub>2</sub> carbonyl O atoms derived from L<sup>2−</sup> main ligands, two <em>μ</em><sub>3</sub> as well as two <em>μ</em><sub>2</sub> hydroxyl O atoms originated from two Hthma<sup>2−</sup> and two <em>µ</em><sub>2</sub> O atoms from two acac<sup>−</sup>. Magnetic research concluded that <strong>1</strong> displays magnetocaloric effect (−<em>ΔS</em><sub>m</sub> = 29.91 J K<sup>−1</sup> kg<sup>−1</sup>) and <strong>2</strong> displays extremely weak antiferromagnetic interaction among neighboring rare earth ions. Single molecule magnet behaviors were possibly detected in <strong>2</strong>, however no characteristic maximum was reached above 2 K.</div></div>\",\"PeriodicalId\":16414,\"journal\":{\"name\":\"Journal of Molecular Structure\",\"volume\":\"1334 \",\"pages\":\"Article 141750\"},\"PeriodicalIF\":4.7000,\"publicationDate\":\"2025-07-05\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Molecular Structure\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0022286025004363\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2025/2/22 0:00:00\",\"PubModel\":\"Epub\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Molecular Structure","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022286025004363","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/2/22 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Two tetranuclear lanthanide complexes respectively featuring magnetocaloric effect and slow magnetization relaxation
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 (−ΔSm = 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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