[{Dy(hfaC)(3)}(2)(Fe(bpca)(2))}]center dot CHCl(3) ([Dy(2)Fe]) and [{Dy(hfac)(3)}(2){Ni-(bpca)(2)}]center dot CHCl(3) ([Dy(2)Ni]) (in which hfac(-) = 1,1,1,5,5,5-hexafluoroacetylacetonate and bpca-=bis(2-pyridylcarbonyl)amine anion) were synthesized and characterized. Single-crystal X-ray diffraction shows that [Dy(2)Fe] and [Dy(2)Ni] are linear trinuclear complexes. Static magnetic susceptibility measurements reveal a weak ferromagnetic exchange interaction between Ni(II) and Dy(III) ions in [Dy(2)Ni], whereas the use of the diamagnetic Fen ion leads to the absence of magnetic exchange interaction in [Dy(2)Fe]. Dynamic susceptibility measurements show a thermally activated behavior with the energy barrier of 9.7 and 4.9 K for the [Dy(2)Fe] and [Dy(2)Ni] complexes, respectively. A surprising negative effect of the ferromagnetic exchange interaction has been found and has been attributed to the structural conformation of these trinuclear complexes.
Effects of 3d-4f magnetic exchange interactions on the dynamics of the magnetization of Dy(III)-M(II)-Dy(III) trinuclears clusters / F. POINTILLART; K. BERNOT; R. SESSOLI; D. GATTESCHI. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - STAMPA. - 13:(2007), pp. 1602-1609. [10.1002/chem.200601194]
Effects of 3d-4f magnetic exchange interactions on the dynamics of the magnetization of Dy(III)-M(II)-Dy(III) trinuclears clusters
SESSOLI, ROBERTA;GATTESCHI, DANTE
2007
Abstract
[{Dy(hfaC)(3)}(2)(Fe(bpca)(2))}]center dot CHCl(3) ([Dy(2)Fe]) and [{Dy(hfac)(3)}(2){Ni-(bpca)(2)}]center dot CHCl(3) ([Dy(2)Ni]) (in which hfac(-) = 1,1,1,5,5,5-hexafluoroacetylacetonate and bpca-=bis(2-pyridylcarbonyl)amine anion) were synthesized and characterized. Single-crystal X-ray diffraction shows that [Dy(2)Fe] and [Dy(2)Ni] are linear trinuclear complexes. Static magnetic susceptibility measurements reveal a weak ferromagnetic exchange interaction between Ni(II) and Dy(III) ions in [Dy(2)Ni], whereas the use of the diamagnetic Fen ion leads to the absence of magnetic exchange interaction in [Dy(2)Fe]. Dynamic susceptibility measurements show a thermally activated behavior with the energy barrier of 9.7 and 4.9 K for the [Dy(2)Fe] and [Dy(2)Ni] complexes, respectively. A surprising negative effect of the ferromagnetic exchange interaction has been found and has been attributed to the structural conformation of these trinuclear complexes.File | Dimensione | Formato | |
---|---|---|---|
CAEJ2007_(RS5).pdf
Accesso chiuso
Tipologia:
Versione finale referata (Postprint, Accepted manuscript)
Licenza:
Tutti i diritti riservati
Dimensione
348.99 kB
Formato
Adobe PDF
|
348.99 kB | Adobe PDF | Richiedi una copia |
I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.