{"title":"Spin Crossover in Iron(II) Complexes with 2,6-bis(1H-imidazol-2-yl)Pyridines. Review","authors":"L. G. Lavrenova","doi":"10.1134/S0022476625040158","DOIUrl":null,"url":null,"abstract":"<p>This review presents the results of a cycle of works on the synthesis and analysis of iron(II) coordination compounds with polynitrogeneous heterocyclic ligands - 2,6-bis(1<i>H</i>-imidazol-2-yl)pyridine derivatives. Ligands of this class are coordinated to the Fe(II) ion in the tridentate cyclic mode via two nitrogen atoms of imidazole rings and the pyridine nitrogen atom with the formation of [<i>M</i>L<sub>2</sub>]<sup>2+</sup> cation complexes (FeN<sub>6</sub> coordination core). The study of the temperature dependence of magnetic susceptibility shows that the majority of complexes obtained exhibit spin crossover <sup>1</sup><i>A</i><sub>1</sub> ↔ <sup>5</sup><i>T</i><sub>2</sub>. In a number of compounds, a change in spin multiplicity is accompanied by thermochromism. The factors affecting the spin crossover temperature and character are discussed.</p>","PeriodicalId":668,"journal":{"name":"Journal of Structural Chemistry","volume":"66 4","pages":"803 - 867"},"PeriodicalIF":1.2000,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Structural Chemistry","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1134/S0022476625040158","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
This review presents the results of a cycle of works on the synthesis and analysis of iron(II) coordination compounds with polynitrogeneous heterocyclic ligands - 2,6-bis(1H-imidazol-2-yl)pyridine derivatives. Ligands of this class are coordinated to the Fe(II) ion in the tridentate cyclic mode via two nitrogen atoms of imidazole rings and the pyridine nitrogen atom with the formation of [ML2]2+ cation complexes (FeN6 coordination core). The study of the temperature dependence of magnetic susceptibility shows that the majority of complexes obtained exhibit spin crossover 1A1 ↔ 5T2. In a number of compounds, a change in spin multiplicity is accompanied by thermochromism. The factors affecting the spin crossover temperature and character are discussed.
期刊介绍:
Journal is an interdisciplinary publication covering all aspects of structural chemistry, including the theory of molecular structure and chemical bond; the use of physical methods to study the electronic and spatial structure of chemical species; structural features of liquids, solutions, surfaces, supramolecular systems, nano- and solid materials; and the crystal structure of solids.