Ferrocenyl-substituted nitronyl nitroxide in the design of one-dimensional magnets

By the reaction of M(hfac) 2 (M = Mn( ii ), Co( ii ), Cu( ii ), and Zn( ii ); hfac is the hexafluoroacetylacetonate anion) and ferrocenyl-substituted nitronyl nitroxide (L), we succeeded in the synthesis of stable heterospin complexes: mononuclear [Zn(hfac) 2 L], trinuclear {[Cu(hfac) 2 ] 3 L 2 } an...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2024-01, Vol.53 (4), p.1714-1721
Main Authors: Maryunina, Kseniya, Nigomedyanova, Daria, Morozov, Vitaly, Smirnova, Kristina, Letyagin, Gleb, Romanenko, Galina, Efimov, Nikolay, Bogomyakov, Artem, Ovcharenko, Victor
Format: Article
Language:English
Subjects:
Coercivity
Copper
Magnets
Manganese
Substitutes
Zinc
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Summary:By the reaction of M(hfac) 2 (M = Mn( ii ), Co( ii ), Cu( ii ), and Zn( ii ); hfac is the hexafluoroacetylacetonate anion) and ferrocenyl-substituted nitronyl nitroxide (L), we succeeded in the synthesis of stable heterospin complexes: mononuclear [Zn(hfac) 2 L], trinuclear {[Cu(hfac) 2 ] 3 L 2 } and chain polymer [Mn(hfac) 2 L] n and [Co(hfac) 2 L] n . The specific steric bulkiness of the ferrocenyl substituent leads to the formation of trans -type coordination polyhedra in the [Mn(hfac) 2 L] n and [Co(hfac) 2 L] n chains. The introduction of the ferrocene substituent leads to an effective weakening of intermolecular or interchain magnetic exchange coupling. Ferrimagnetic ordering was observed for one-dimensional complexes [M(hfac) 2 L] n (M = Mn( ii ), Co( ii )). [Co(hfac) 2 L] n exhibits features of single-chain magnet behaviour: slow relaxation of magnetization below 13 K is associated with a high coercive field (54 kOe at 2 K). A trans -chain polymer Co( ii ) complex with polyfunctional ferrocenyl-substituted nitroxide exhibits single-chain magnet behavior with T B 13 K and H C = 54 kOe.
ISSN:1477-9226
1477-9234
DOI:10.1039/d3dt03858k