{"title":"具有超磁†的四边形CoII框架的无限二维薄片","authors":"Arindam Gupta, Pramod Bhatt and Sanjit Konar","doi":"10.1039/D5NJ00157A","DOIUrl":null,"url":null,"abstract":"<p >A two-dimensional coordination polymer [Co(pyz)(CA)]<small><sub><em>n</em></sub></small> (complex <strong>1</strong>) was synthesized and structurally characterized. Solid-state dc magnetic susceptibility revealed overall antiferromagnetic interactions in the complex with an antiferromagnetic ordering below 7 K (Néel temperature, <em>T</em><small><sub>N</sub></small>). Magnetization measurements revealed a sigmoidal nature indicative of metamagnetic behaviour, with an abrupt increase in magnetization at 4.7 T. Variable field susceptibility studies indicated a magnetic phase transition, marked by a cusp at 11 K that disappeared at fields above 0.05 T. Hydrostatic pressure decreased the overall magnetic moment without altering the <em>T</em><small><sub>N</sub></small> or the hysteresis width. Broken-symmetry density functional theory (BS-DFT) calculations indicated antiferromagnetic interactions between Co<small><sup>II</sup></small> ions mediated by pyrazine and chloranilate anions, and also emphasized the significant role of easy-axis anisotropy of the Co<small><sup>II</sup></small> ion in the metamagnetic behaviour in complex <strong>1</strong>.</p>","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":" 20","pages":" 8225-8231"},"PeriodicalIF":2.5000,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/nj/d5nj00157a?page=search","citationCount":"0","resultStr":"{\"title\":\"An infinite 2D sheet of tetragonal CoII framework exhibiting metamagnetism†\",\"authors\":\"Arindam Gupta, Pramod Bhatt and Sanjit Konar\",\"doi\":\"10.1039/D5NJ00157A\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >A two-dimensional coordination polymer [Co(pyz)(CA)]<small><sub><em>n</em></sub></small> (complex <strong>1</strong>) was synthesized and structurally characterized. Solid-state dc magnetic susceptibility revealed overall antiferromagnetic interactions in the complex with an antiferromagnetic ordering below 7 K (Néel temperature, <em>T</em><small><sub>N</sub></small>). Magnetization measurements revealed a sigmoidal nature indicative of metamagnetic behaviour, with an abrupt increase in magnetization at 4.7 T. Variable field susceptibility studies indicated a magnetic phase transition, marked by a cusp at 11 K that disappeared at fields above 0.05 T. Hydrostatic pressure decreased the overall magnetic moment without altering the <em>T</em><small><sub>N</sub></small> or the hysteresis width. Broken-symmetry density functional theory (BS-DFT) calculations indicated antiferromagnetic interactions between Co<small><sup>II</sup></small> ions mediated by pyrazine and chloranilate anions, and also emphasized the significant role of easy-axis anisotropy of the Co<small><sup>II</sup></small> ion in the metamagnetic behaviour in complex <strong>1</strong>.</p>\",\"PeriodicalId\":95,\"journal\":{\"name\":\"New Journal of Chemistry\",\"volume\":\" 20\",\"pages\":\" 8225-8231\"},\"PeriodicalIF\":2.5000,\"publicationDate\":\"2025-04-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://pubs.rsc.org/en/content/articlepdf/2025/nj/d5nj00157a?page=search\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"New Journal of Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://pubs.rsc.org/en/content/articlelanding/2025/nj/d5nj00157a\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"New Journal of Chemistry","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2025/nj/d5nj00157a","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
合成了一种二维配位聚合物[Co(pyz)(CA)]n（配合物1）并进行了结构表征。固态直流磁化率揭示了配合物的整体反铁磁相互作用，其反铁磁有序度低于7 K （n温度，TN）。磁化测量结果表明，在4.7 t时，磁化强度突然增加，呈s型性质，表明了超磁行为，可变磁场磁化率研究表明，磁相变在11 K时出现尖峰，在0.05 t以上的磁场中消失，静水压力降低了总磁矩，但没有改变TN或磁滞宽度。破对称密度泛函理论（BS-DFT）计算表明了吡嗪和氯苯甲酸阴离子介导的CoII离子之间的反铁磁相互作用，并强调了CoII离子的易轴各向异性在配合物1的超磁性行为中的重要作用。
An infinite 2D sheet of tetragonal CoII framework exhibiting metamagnetism†
A two-dimensional coordination polymer [Co(pyz)(CA)]n (complex 1) was synthesized and structurally characterized. Solid-state dc magnetic susceptibility revealed overall antiferromagnetic interactions in the complex with an antiferromagnetic ordering below 7 K (Néel temperature, TN). Magnetization measurements revealed a sigmoidal nature indicative of metamagnetic behaviour, with an abrupt increase in magnetization at 4.7 T. Variable field susceptibility studies indicated a magnetic phase transition, marked by a cusp at 11 K that disappeared at fields above 0.05 T. Hydrostatic pressure decreased the overall magnetic moment without altering the TN or the hysteresis width. Broken-symmetry density functional theory (BS-DFT) calculations indicated antiferromagnetic interactions between CoII ions mediated by pyrazine and chloranilate anions, and also emphasized the significant role of easy-axis anisotropy of the CoII ion in the metamagnetic behaviour in complex 1.
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