Dawit Tesfaye, Mamo Gebrezgiabher, Jonas Braun, Juraj Kuchár, Juraj Černák, Atakilt Abebe, Pascal Boulet, Nandakumar Kalarikkal, Tim Hochdörffer, Volker Schünemann, Christopher E. Anson, Madhu Thomas and Annie K. Powell
{"title":"顺式fen4o2配位环境下铁（iii）席夫碱配合物的宽自旋交叉","authors":"Dawit Tesfaye, Mamo Gebrezgiabher, Jonas Braun, Juraj Kuchár, Juraj Černák, Atakilt Abebe, Pascal Boulet, Nandakumar Kalarikkal, Tim Hochdörffer, Volker Schünemann, Christopher E. Anson, Madhu Thomas and Annie K. Powell","doi":"10.1039/D5NJ02493E","DOIUrl":null,"url":null,"abstract":"<p >Asymmetrical condensation of ethylenediamine with 5-bromo-2-hydroxybenzaldehyde yielded a Schiff base, (<em>E</em>)-2-(((2-aminoethyl)imino)methyl)-4-bromophenol (<strong>5-Brsaen</strong>), and the reaction with Fe(NO<small><sub>3</sub></small>)<small><sub>3</sub></small>·9H<small><sub>2</sub></small>O generated the complex [Fe(<strong>5-Brsaen</strong>)<small><sub>2</sub></small>]NO<small><sub>3</sub></small>·CH<small><sub>3</sub></small>OH (<strong>1</strong>). The complex was characterised by single crystal XRD measurements, elemental analysis, FT-IR spectra, DC magnetic susceptibility measurements and variable temperature Mössbauer spectroscopy. The single crystal XRD studies of <strong>1</strong> at 293 K and 173 K reveal that the Fe–N and Fe–O bond lengths are intermediate between what would be expected for HS and LS Fe(<small>III</small>). The hydrogen bonds result in a 2D supramolecular structure. DC magnetic measurements between 300 and 2 K reveal that the compound does not reach a pure HS state even at RT. Furthermore, the proportion of HS to LS decreases as the temperature decreases and reaches a LS state at 2 K. Variable temperature Mössbauer spectra are in line with this conclusion.</p>","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":" 34","pages":" 14776-14781"},"PeriodicalIF":2.5000,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Broad spin crossover in an iron(iii) Schiff base complex with a cis-FeN4O2 coordination environment†\",\"authors\":\"Dawit Tesfaye, Mamo Gebrezgiabher, Jonas Braun, Juraj Kuchár, Juraj Černák, Atakilt Abebe, Pascal Boulet, Nandakumar Kalarikkal, Tim Hochdörffer, Volker Schünemann, Christopher E. Anson, Madhu Thomas and Annie K. Powell\",\"doi\":\"10.1039/D5NJ02493E\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Asymmetrical condensation of ethylenediamine with 5-bromo-2-hydroxybenzaldehyde yielded a Schiff base, (<em>E</em>)-2-(((2-aminoethyl)imino)methyl)-4-bromophenol (<strong>5-Brsaen</strong>), and the reaction with Fe(NO<small><sub>3</sub></small>)<small><sub>3</sub></small>·9H<small><sub>2</sub></small>O generated the complex [Fe(<strong>5-Brsaen</strong>)<small><sub>2</sub></small>]NO<small><sub>3</sub></small>·CH<small><sub>3</sub></small>OH (<strong>1</strong>). The complex was characterised by single crystal XRD measurements, elemental analysis, FT-IR spectra, DC magnetic susceptibility measurements and variable temperature Mössbauer spectroscopy. The single crystal XRD studies of <strong>1</strong> at 293 K and 173 K reveal that the Fe–N and Fe–O bond lengths are intermediate between what would be expected for HS and LS Fe(<small>III</small>). The hydrogen bonds result in a 2D supramolecular structure. DC magnetic measurements between 300 and 2 K reveal that the compound does not reach a pure HS state even at RT. Furthermore, the proportion of HS to LS decreases as the temperature decreases and reaches a LS state at 2 K. Variable temperature Mössbauer spectra are in line with this conclusion.</p>\",\"PeriodicalId\":95,\"journal\":{\"name\":\"New Journal of Chemistry\",\"volume\":\" 34\",\"pages\":\" 14776-14781\"},\"PeriodicalIF\":2.5000,\"publicationDate\":\"2025-07-25\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"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/d5nj02493e\",\"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/d5nj02493e","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Broad spin crossover in an iron(iii) Schiff base complex with a cis-FeN4O2 coordination environment†
Asymmetrical condensation of ethylenediamine with 5-bromo-2-hydroxybenzaldehyde yielded a Schiff base, (E)-2-(((2-aminoethyl)imino)methyl)-4-bromophenol (5-Brsaen), and the reaction with Fe(NO3)3·9H2O generated the complex [Fe(5-Brsaen)2]NO3·CH3OH (1). The complex was characterised by single crystal XRD measurements, elemental analysis, FT-IR spectra, DC magnetic susceptibility measurements and variable temperature Mössbauer spectroscopy. The single crystal XRD studies of 1 at 293 K and 173 K reveal that the Fe–N and Fe–O bond lengths are intermediate between what would be expected for HS and LS Fe(III). The hydrogen bonds result in a 2D supramolecular structure. DC magnetic measurements between 300 and 2 K reveal that the compound does not reach a pure HS state even at RT. Furthermore, the proportion of HS to LS decreases as the temperature decreases and reaches a LS state at 2 K. Variable temperature Mössbauer spectra are in line with this conclusion.
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