Two dysprosium complexes based on TEMPO radical derivative: synthesis, structures, magnetic and fluorescent properties

Abstract

A new TEMPO derivative was synthesized and two Dy-radical complexes, [Dy(hfac)₃(H₂O)hmb-TEMPO] (1) and [Dy(hfac)₃(hmb-TEMPO)₂] (2, hmb-TEMPO = 4-((2-hydroxy-3-methoxybenzylidene)amino)-2,2,6,6-tetramethyl; hfac = hexafluoroacetylacetonate), were synthesized through reacting hmb-TEMPO radical and Dy(hfac)₃ with 1:1 and 1:2 ratio, respectively. The structures of 1 and 2 were elucidated by single-crystal X-ray structural analysis. Both 1 and 2 feature mononuclear structures. Nonzero out-of-phase signals were observed for both Dy derivatives, indicating single-molecule magnet behavior. The room-temperature photoluminescence spectra of 1 and 2 exhibit strong emissions in the visible region.

KEYWORDS:

• TEMPO derivative
• Dy complex
• single-molecule magnet
• luminescent properties

Acknowledgments

This work was supported by the Science and Technology Program of Guangzhou (No. 202102020597) and the Innovation Training Program for College Students (No. 202211078120).

Disclosure statement

No potential conflict of interest was reported by the authors.