Magnetic properties of a europium() complex - possible multiplet crossover

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 53; no. 4; pp. 1492 - 1496
• Main Authors: Mi ová, Romana, Bielková, Zuzana, Rajnák, Cyril, Titiš, Ján, Monco, Ján, Bie ko, Alina, Bo a, Roman
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 23.01.2024
• Subjects: Diamagnetism; Europium; Fine structure; Heating; Imines; Magnetic permeability; Magnetic properties; Nitrogen tetroxide; Structural analysis
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d3dt03901c

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. 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, IR, electronic and fluorescence spectroscopy.