Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

An influence of fluorinated alkyl substituents on structure and magnetic properties of Mn(II) complexes with pyrazolyl-substituted nitronyl nitroxides

Ekaterina Kudryavtseva
,
Andrey Serykh
,
Bogdan Ugrak
,
Tatyana Dutova
,
Darina I. Nasyrova
ORCID logo ,
Alexander Korlyukov
ORCID logo ,
Mikhail A. Zykin
,
Nikolay Nikolaevich Efimov
ORCID logo ,
Artem S. Bogomyakov
ORCID logo ,
Evgeny Tretyakov
* ORCID logo
Version 1 : Received: 22 September 2023 / Approved: 25 September 2023 / Online: 26 September 2023 (04:32:12 CEST)

A peer-reviewed article of this Preprint also exists.

Kudryavtseva, E.; Serykh, A.; Ugrak, B.; Dutova, T.; Nasyrova, D.; Korlyukov, A.; Zykin, M.; Efimov, N.; Bogomyakov, A.; Tretyakov, E. An Influence of Fluorinated Alkyl Substituents on Structure and Magnetic Properties of Mn(II) Complexes with Pyrazolyl-Substituted Nitronyl Nitroxides. Crystals 2023, 13, 1528. Kudryavtseva, E.; Serykh, A.; Ugrak, B.; Dutova, T.; Nasyrova, D.; Korlyukov, A.; Zykin, M.; Efimov, N.; Bogomyakov, A.; Tretyakov, E. An Influence of Fluorinated Alkyl Substituents on Structure and Magnetic Properties of Mn(II) Complexes with Pyrazolyl-Substituted Nitronyl Nitroxides. Crystals 2023, 13, 1528.

Abstract

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∸N<} or {>N∸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.

Keywords

nitronyl nitroxides; metal-nitroxide complexes; crystal structures; magnetic properties

Subject

Chemistry and Materials Science, Other

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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