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Slow magnetic relaxation in O–Se–O bridged manganese(iii) Schiff base complexes

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Abstract

Two new chain complexes consisting of a Mn(salen) building block bridged by O–Se–O units, [Mn2(salen)2(L)](ClO4) (1) and {[Mn(salen)]2(L)2}·Y (2) (salen = N,N′-bis(salicylidene)-ethylenediamine, L = 3,4,5-trifluorobenzeneseleninic acid, Y = salicylaldehyde) have been synthesized and characterized structurally and magnetically. In the two complexes above, the 3,4,5-trifluorobenzeneseleninic acid ligand adopts a synanti bridging coordination mode and all the MnIII ions show a distorted octahedral geometry. In complex 1, the [Mn2(salen)2]2+ dimers are connected alternatively by the bridging ligands into an infinite zigzag chain, while the [Mn(salen)]+ monomers are connected alternatively in complex 2. The magnetic measurements reveal that both complexes exhibit slow magnetic relaxation behaviours with an effective energy barrier Ueff = 31.2 K for 1 and Ueff = 35.1 K for 2, respectively. These compounds are rare examples of a small number of aromatic selenite based magnetic materials.

Graphical abstract: Slow magnetic relaxation in O–Se–O bridged manganese(iii) Schiff base complexes

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Submitted
22 Nov 2019
Accepted
13 Jan 2020
First published
13 Jan 2020

New J. Chem., 2020, Advance Article
Article type
Paper

Slow magnetic relaxation in O–Se–O bridged manganese(III) Schiff base complexes

S. Zhang, S. Li, S. Zeng, Y. Shi, D. Wang and L. Chen, New J. Chem., 2020, Advance Article , DOI: 10.1039/C9NJ05837K

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