Magnetic properties of a europium(III) complex - possible multiplet crossover.
Romana MičováZuzana BielkováCyril RajnákJán TitišJán Moncol'Alina BieńkoRoman BočaPublished in: Dalton transactions (Cambridge, England : 2003) (2024)
A dinuclear complex [(H 2 O)Zn(LH)Eu(NO 3 ) 3 ] containing a hexadentate Schiff-base {N 2 O 4 }-donor ligand LH 2- was prepared and characterized by X-ray structural analysis and IR, electronic and fluorescence spectroscopy. DC magnetic data show that upon heating the diamagnetic complex with the ground state Eu(III)- 7 F 0 and Zn(II)- 1 S switches to paramagnetic species due to the population of 7 F J ( J = 1 to 6) magnetic multiplets. The magnetic susceptibility increases from zero, passes through a maximum, and then decreases upon heating. This behaviour can be explained using a spin-orbit Hamiltonian with an axial distortion term. There is an alternative interpretation of the susceptibility data based on a two-level model similar to that used in the spin crossover theory.
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