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Equatorial Coordination Optimization for Enhanced Axiality of Mononuclear Dy(III) Single-Molecule Magnets

Abstract

We present a controlled synthetic route to operate the equatorial coordination environment of three Dy(III) borohydrides complexes: Dy(BH4)3(THF)3 (1), [Dy(BH4)2(THF)5][BPh4] (2) and [Dy(BH4)2(18-C-6)][Na(THF)2(18-C-6)][BPh4]2 (3) (THF = tetrahydrofuran, BPh4 = tetraphenyl borate, 18-C-6 = 18-crown-6-ether), which have the same axial coordination environment while different equatorial sites. Such an alternation leads to a significant change of magnetic properties. In the absence of dc field, complex 1 with three THF molecules and one BH4 ligand in the equatorial plane shows no single-molecule magnet (SMM) behaviour, complex 2 having five THF molecules at equatorial sites displays small tails of out-of-phase (χ") signals, and complex 3 containing one 18-C-6 with six O atoms in the equatorial plane exhibits χ" signals at higher temperatures. This result represents an optimaization of equatorial coordination environment for Dy(III) mononuclear single-molecule magnets.

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Article information


Submitted
02 Jan 2020
Accepted
04 Feb 2020
First published
04 Feb 2020

Dalton Trans., 2020, Accepted Manuscript
Article type
Paper

Equatorial Coordination Optimization for Enhanced Axiality of Mononuclear Dy(III) Single-Molecule Magnets

Y. Zheng, K. Yu, T. Han, Y. Ding and Y. Zhai, Dalton Trans., 2020, Accepted Manuscript , DOI: 10.1039/D0DT00011F

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