دورية أكاديمية
An Influence of Fluorinated Alkyl Substituents on Structure and Magnetic Properties of Mn(II) Complexes with Pyrazolyl-Substituted Nitronyl Nitroxides
| العنوان: | An Influence of Fluorinated Alkyl Substituents on Structure and Magnetic Properties of Mn(II) Complexes with Pyrazolyl-Substituted Nitronyl Nitroxides |
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| المؤلفون: | Ekaterina Kudryavtseva, Andrey Serykh, Bogdan Ugrak, Tatyana Dutova, Darina Nasyrova, Alexander Korlyukov, Mikhail Zykin, Nikolay Efimov, Artem Bogomyakov, Evgeny Tretyakov |
| المصدر: | Crystals, Vol 13, Iss 10, p 1528 (2023) |
| بيانات النشر: | MDPI AG, 2023. |
| سنة النشر: | 2023 |
| المجموعة: | LCC:Crystallography |
| مصطلحات موضوعية: | nitronyl nitroxides, metal–nitroxide complexes, crystal structures, magnetic properties, Crystallography, QD901-999 |
| الوصف: | New complexes of manganese(II) hexafluoroacetylacetonate [Mn(hfac)2] with 2-(1-R-3-pyrazol-4-yl)-4,4,5,5-tetramethyl-2-imidazoline-3-oxide-1-oxyl (R = CHF2, CH2CH2F, CH2CHF2 or CH2CF3) were synthesised and characterised structurally and magnetically. All complexes were prepared under similar conditions. Nonetheless, their crystal structures were considerably different. Depending on the structure of fluorinated alkyl substituent R, the complexation reaction led to complexes of three types: chain-polymeric complexes with the head-to-head or head-to-tail motif and complexes of molecular structure. All complexes show strong antiferromagnetic behaviour in a high-temperature region (150–300 K) and weak ferro- or antiferromagnetic exchange interactions at low temperatures. The stronger antiferromagnetic exchange, −101.7 ± 1.5 or −136 ± 10 cm−1, −82.3 ± 1.3 cm−1 and −87.4 ± 1.3 cm−1, was attributed to the magnetic interaction in three- or two-spin clusters: {>N∸O–Mn2+–O∸NN∸O–Mn2+}, respectively. The weaker antiferromagnetic interaction, −0.005, between three-spin clusters or ferromagnetic interactions, 0.18–0.81 cm−1, between two-spin clusters are realised through the pyrazole ring or intermolecular contacts. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 13101528 2073-4352 |
| Relation: | https://www.mdpi.com/2073-4352/13/10/1528; https://doaj.org/toc/2073-4352 |
| DOI: | 10.3390/cryst13101528 |
| URL الوصول: | https://doaj.org/article/fb6d21d6211245fcb54bdce3ceabde73 |
| رقم الأكسشن: | edsdoj.fb6d21d6211245fcb54bdce3ceabde73 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 13101528 20734352 |
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| DOI: | 10.3390/cryst13101528 |