Cu(II) Complexes with Fluoroalkyl-Pyrazolyl-Substituted Nitronyl Nitroxides

Cu(II) Complexes with Fluoroalkyl-Pyrazolyl-Substituted Nitronyl Nitroxides Full article

Journal

Crystal Growth & Design
ISSN: 1528-7483 , E-ISSN: 1528-7505

Output data

Year: 2026, DOI: 10.1021/acs.cgd.6c01128

Authors

Romanenko Galina ¹ , Artiukhova Natalia ^1,2 , Fokin Sergey ¹ , Tretyakov Evgeny ³ , Ugrak Bogdan ³ , Aidakova Kristina ^1,2 , Letyagin Gleb ^1,2 , Bogomyakov Artem ^1,2

Affiliations

1	International Tomography Center of the Siberian Branch of the Russian Academy of Sciences 3a Institutskaya St., Novosibirsk 630090, Russia
2	Novosibirsk State University, 1 Pirogova Street, Novosibirsk 630090, Russia
3	N.D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences 47 Leninsky Avenue, Moscow 119991, Russia

Synthetic methods of heterospin compounds based on copper hexafluoroacetylacetonate [Cu(hfac)2] and nitronyl nitroxide radicals containing fluorinated alkyl substituents in the pyrazole ring 2-(1-R-3-pyrazol-4-yl)-4,4,5,5-tetramethyl-2-imidazoline-3-oxide-1-oxyl, where R = CHF2 (L12), CH2CH2F (L21), CH2CHF2 (L22) or CH2CF3 (L23) were developed. Single crystals of two chain polymers [Cu(hfac)2(L12)]n and [Cu(hfac)2L23]n·0.5C6H14 and solvates of molecular [Cu3(hfac)6(L21)2]·C6H14, [Cu3(hfac)6(L22)2]·2CH2Cl2, [Cu5(hfac)10(L21)4]·solv (solv = C6H14, 2CH2Cl2) and [Cu5(hfac)10(L22)4]·C6H14 complexes were grown. Their structures and magnetic properties were studied. It was established that upon cooling of the [Cu5(hfac)10(L21)4]·2CH2Cl2 crystal, a magneto-structural phase transition associated with a reduction in the Cu−ONO distances in the environment of the central Cu atom is realized. The transformation of this three-spin exchange cluster {>N−O•−Cu(II)−•O−N<} leads to a change in the nature of the exchange interactions from ferro-to antiferromagnetic, which is reflected in the type of temperature dependence of the effective magnetic moment.

Romanenko G. , Artiukhova N. , Fokin S. , Tretyakov E. , Ugrak B. , Aidakova K. , Letyagin G. , Bogomyakov A.
Cu(II) Complexes with Fluoroalkyl-Pyrazolyl-Substituted Nitronyl Nitroxides
Crystal Growth & Design. 2026. DOI: 10.1021/acs.cgd.6c01128 OpenAlex

Submitted:	Jul 29, 2026
Accepted:	Sep 14, 2026
Published print:	Sep 22, 2026

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