Slow relaxation of magnetization for a Tb derivative in a biradical-based lanthanide chain

A series of one-dimensional lanthanide chains [Ln(hfac) 3 (NITPh(4-NIT))] n (Ln( iii ) = Y 1 , Gd 2 , Tb 3 and Dy 4 , hfac = hexafluoroacetylacetonate; NITPh(4-NIT) = 1,4-bis-(l′-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl-4,5-dihydro-1 H -imidazol-2′-yl) benzene) based on a nitronyl nitroxide biradical l...

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Bibliographic Details
Published in:New journal of chemistry 2020-05, Vol.44 (19), p.7858-7864
Main Authors: Deng, Xiaochun, Ma, Shuqi, Zhu, Mei, Zhang, Li, Lv, Yaohong
Format: Article
Language:English
Subjects:
Antiferromagnetism
Benzene
Chains
Crystallography
Gadolinium
Ligands
Magnetic induction
Magnetic properties
Magnetic relaxation
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Summary:A series of one-dimensional lanthanide chains [Ln(hfac) 3 (NITPh(4-NIT))] n (Ln( iii ) = Y 1 , Gd 2 , Tb 3 and Dy 4 , hfac = hexafluoroacetylacetonate; NITPh(4-NIT) = 1,4-bis-(l′-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl-4,5-dihydro-1 H -imidazol-2′-yl) benzene) based on a nitronyl nitroxide biradical ligand (NITPh(4-NIT)) has been successfully achieved and characterized. The NITPh(4-NIT) biradicals bridged Ln(hfac) 3 units through their NO groups of two mono-radicals to develop a one-dimensional chain with a 'zig-zag' motif. Magnetic investigation shows that within the biradical ligand, two unpaired electrons are delocalized and expected to be antiferromagnetically coupled. The magnetic behavior of complexes have been analyzed by using an appropriate magnetic model with antiferromagnetic [Ln-biradical] moieties. Moreover, the Tb complex reveals field induced slow magnetic relaxation, arising from the SIM behavior of the Tb( iii ) center ion. Four novel lanthanide-biradical chains have been obtained and the Tb derivative reveals field-induced slow magnetic relaxation behavior with an anisotropy barrier Δ / k B = 22.08 K.
ISSN:1144-0546
1369-9261
DOI:10.1039/d0nj00188k