Issue 8, 2016

Thermostability and photoluminescence of Dy(iii) single-molecule magnets under a magnetic field

Abstract

A series of compounds [ADyL4]ยท[solvent] composed of a dysprosium(III) ion coordinated by four chelated naphthyridine-like ligands (L = 4-hydroxy-8-methyl-1,5-naphthyridine-3-carbonitrile) and an alkali metal ion (A = Na, K, Rb, Cs) were synthesized and characterized. They behave as single-molecule magnets under a zero dc field with an effective energy barrier of around 95 cmโˆ’1. Meanwhile, the main part, [ADyL4], of these SMMs is thermostable and sublimable. The geometric structures of three sublimed compounds are identical to the original ones without solvents, which is confirmed by X-ray diffraction using single crystal and powder samples. The static and dynamic magnetic properties remain unchanged before and after sublimation. Luminescence measurements at 5โ€“77 K were performed to verify the energy gap between low-lying states and to understand the pathway of the thermal relaxation process of magnetization, as well as to inspect the tiny variation in magnetic sublevels for the ground term of Dy(III). The photoluminescence spectra under a magnetic field (0โ€“36 T) for the Dy-SMMs are investigated for the first time. The energy splitting of the two lowest sublevels of the ground term 6H15/2 of Dy(III) are analyzed using the Zeeman formula.

Graphical abstract: Thermostability and photoluminescence of Dy(iii) single-molecule magnets under a magnetic field

Supplementary files

Article information

Article type
Edge Article
Submitted
14 Mar 2016
Accepted
12 May 2016
First published
12 May 2016
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2016,7, 5020-5031

Thermostability and photoluminescence of Dy(III) single-molecule magnets under a magnetic field

Y. Bi, C. Chen, Y. Zhao, Y. Zhang, S. Jiang, B. Wang, J. Han, J. Sun, Z. Bian, Z. Wang and S. Gao, Chem. Sci., 2016, 7, 5020 DOI: 10.1039/C6SC01157H

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