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Crystallization and single molecule magnetic behavior of quadruple-stranded helicates: tuning the anisotropic axes

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Abstract

It has been successfully proven that the bis-β-diketone ligands with proper lengths and flexibility are essential for the construction of multiple-stranded helicates, where two Dy3+ centers in subtly different environments allow the tuning of the anisotropic axes. Based on our previous work, we have designed a flexible bis-β-diketone ligand BTT (BTT = 3,3′′-bis(4,4,4-trifluoro-1,3-dioxobutyl)-m-terphenyl), which is successfully utilized to construct quadruple-stranded helicates with the formula of [C6H16N]2[Ln2(BTT)4]·2CH2Cl2·4CH3OH [Ln = Ce (1), Dy (2)]. Structural analysis indicates that they crystallize in the tetragonal space group P4/n, and each Ln3+ center is chelated by four diketonate moieties from four ligands, giving rise to a dinuclear quadruple-stranded helicate. Magnetic measurements show that 2 displays single molecular magnet behavior under an applied DC field of 2000 Oe. Further investigations indicate that the anisotropic axes of the Dy3+ centers can be tuned depending on the bis-β-diketonate ligands used to assemble the Dy helicates.

Graphical abstract: Crystallization and single molecule magnetic behavior of quadruple-stranded helicates: tuning the anisotropic axes

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Article information


Submitted
21 Nov 2019
Accepted
28 Jan 2020
First published
29 Jan 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

Crystallization and single molecule magnetic behavior of quadruple-stranded helicates: tuning the anisotropic axes

X. Gao, L. Li, W. Sun and P. Chen, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT04483C

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