Abstract
A new family of LnIII [12-Metallacrown-4] compounds of formulas (C5H6N) [LnFe4(shi)4(C6H5COO)4(Py)4]·3.5Py [Ln = EuIII (1); GdIII (2); TbIII (3); DyIII (4); and, H3shi = salicylhydroxamic acid] were obtained through one-pot reactions with H3shi, Fe(NO3)3·9H2O, and, Ln(NO3)3·6H2O as reagents. Single-crystal X-ray analyses show that they are isostructural and have the similar [12-MCFeIII N(shi)-4] core, with four benzoate molecules bridging the central LnIII ion to the ring FeIII ions. The negative charge of the 12-MC-4 metallacrown is balanced by one pyridinium cation, which forms the hydrogen bond with an adjacent solvent pyridine molecule. Magnetic measurements demonstrate antiferromagnetic coupling interactions and field-induced slow magnetic relaxation in complex 4.
Highlights
With the rapid development of information technology, it is essential to produce information storage materials with higher storage density and faster response speed
In order to further expand Fe-Ln MCs structural types and to study their magnetic properties, we synthesized a series of new LnIII [12-MCFe III N(shi) -4] [Ln = EuIII (1), GdIII (2), TbIII (3), DyIII (4)]
All of the reagents were commercially available without further purification
Summary
With the rapid development of information technology, it is essential to produce information storage materials with higher storage density and faster response speed. It is interesting to investigate the heterometallic Fe-Ln complexes with cyclic structures and to explore their magnetic properties. FeIII with S = 5/2 spin state presenting Spin Crossover (SCO) [35,36,37,38], it is meaningful to explore macrocyclic polynuclear complexes with Fe-Ln MCs structures and magnetic properties. In order to further expand Fe-Ln MCs structural types and to study their magnetic properties, we synthesized a series of new LnIII [12-MCFe III N(shi) -4] [Ln = EuIII (1), GdIII (2), TbIII (3), DyIII (4)]. Complexes through the reactions of salicylhydroxamic acid (H3 shi) and the corresponding metal salts. Their structures were characterized by X-ray single diffraction and the magnetic properties were explored in detail
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