An Influence of Fluorinated Alkyl Substituents on Structure and Magnetic Properties of Mn(II) Complexes with Pyrazolyl-Substituted Nitronyl Nitroxides

An Influence of Fluorinated Alkyl Substituents on Structure and Magnetic Properties of Mn(II) Complexes with Pyrazolyl-Substituted Nitronyl Nitroxides Full article

Journal

Crystals
ISSN: 2073-4352

Output data

Year: 2023, Volume: 13, Number: 10, Article number : 1528, Pages count : DOI: 10.3390/cryst13101528

Authors

Kudryavtseva Ekaterina ¹ , Serykh Andrey ^2,1 , Ugrak Bogdan ¹ , Dutova Tatyana ¹ , Nasyrova Darina ¹ , Korlyukov Alexander ³ , Zykin Mikhail ⁴ , Efimov Nikolay ⁴ , Bogomyakov Artem ⁵ , Tretyakov Evgeny ¹

Affiliations

1	N. D. Zelinsky Institute of Organic Chemistry, Leninsky Ave. 47, 119991 Moscow, Russia
2	D. Mendeleev University of Chemical Technology of Russia, Miusskaya Pl. 9, 125047 Moscow, Russia
3	A. N. Nesmeyanov Institute of Organoelement Compounds, 28 Vavilov Str., 119991 Moscow, Russia
4	N. S. Kurnakov Institute of General and Inorganic Chemistry, Leninsky Ave. 31, 119991 Moscow, Russia
5	International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Institutskaya Str. 3a, 630090 Novosibirsk, Russia

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.

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. V.13. N10. 1528 . DOI: 10.3390/cryst13101528 WOS Scopus OpenAlex

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Scopus:	2-s2.0-85175179230
OpenAlex:	W4387878905

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