Issue 78, 2017, Issue in Progress

Asymmetry-unit-dominated double slow-relaxation modes of 2,6-dimethyl-3,5-heptanedione dysprosium SMMs

Abstract

A series of Hdmh mononuclear dysprosium complexes, namely [Dy(dmh)3(MeOH)] (1), [Dy(dmh)3(2,2′-bpy)]2 (2), and [Dy(dmh)3(phen)] (3), and analogue complexes of complex 2 [Lu(dmh)3(2,2′-bpy)]2 (4) (Hdmh = 2,6-dimethyl-3,5-heptanedione, 2,2′-bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline), have been isolated by reaction of Hdmh and LnCl3·6H2O with 2,2′-bpy/phen auxiliary ligands. X-ray crystallographic analysis reveals that all complexes 1–4 are mononuclear complexes. Complex 1 is seven-coordinated by three dmh ligands and one methanol. Complexes 2, 3 and 4 are all eight-coordinated by three dmh ligands and one 2,2′-bpy or phen. Magnetic studies indicate that complexes 2 and 3 exhibit slow relaxation at zero field but complex 1 does not. Strikingly, complex 2 exhibits mainly single slow relaxation under zero dc field and double slow relaxation under optimized dc field. In contrast, complex 3 exhibits double slow relaxation under zero dc field and single slow relaxation under optimized dc field. The origins of the double slow relaxation modes of complex 2 have been verified by dilution sample of complex 4.

Graphical abstract: Asymmetry-unit-dominated double slow-relaxation modes of 2,6-dimethyl-3,5-heptanedione dysprosium SMMs

Supplementary files

Article information

Article type
Paper
Submitted
01 Sep 2017
Accepted
11 Oct 2017
First published
25 Oct 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 49701-49709

Asymmetry-unit-dominated double slow-relaxation modes of 2,6-dimethyl-3,5-heptanedione dysprosium SMMs

C. Shi, R. Nie, X. Yao, S. Fan, G. An, Y. Dong and G. Li, RSC Adv., 2017, 7, 49701 DOI: 10.1039/C7RA09711E

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