MAGNETIC ANOMALIES IN POLYMERIC CHAIN COMPLEXES Cu(hfac)2 WITH SPIN-LABELED DIALKYLPYRAZOLES

The structures of hexafluoroacetylacetonate complexes of Cu(II)–Cu(hfac) 2 – with nitroxide radicals L R1/R2 , where R1 and R2 are alkyl substituents in the 1,3-pyrazole moiety are studied by X-ray crystallography. It is found that solid phases of all [Cu(hfac) 2 L R1/R2 ] are formed by polymeric ch...

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Bibliographic Details
Published in:Journal of structural chemistry 2022, Vol.63 (1), p.87-99
Main Authors: Romanenko, G. V., Fokin, S. V., Chubakova, E. T., Bogomyakov, A. S., Ovcharenko, V. I.
Format: Article
Language:English
Subjects:
Atomic
Atomic/Molecular Structure and Spectra
Chains (polymeric)
Chemistry
Chemistry and Materials Science
Crystallography
Dynamic structural analysis
Inorganic Chemistry
Magnetic anomalies
Magnetic moments
Molecular
Optical and Plasma Physics
Physical Chemistry
Pyrazole
Solid phases
Solid State Physics
Temperature dependence
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Summary:The structures of hexafluoroacetylacetonate complexes of Cu(II)–Cu(hfac) 2 – with nitroxide radicals L R1/R2 , where R1 and R2 are alkyl substituents in the 1,3-pyrazole moiety are studied by X-ray crystallography. It is found that solid phases of all [Cu(hfac) 2 L R1/R2 ] are formed by polymeric chains whose common structural motif is a ditopic bridging coordination of paramagnetic ligands in the head-to-head fashion. The study of the temperature structure dynamics and the related change in the temperature dependence of the effective magnetic moment of the complex shows that changes in both R1 and R2 can substantially affect not only the possibility of the appearance of magnetic anomalies on the temperature curve of the effective magnetic moment but also its shape.
ISSN:0022-4766
1573-8779
DOI:10.1134/S0022476622010103