Understanding the near-infrared fluorescence and field-induced single-molecule-magnetic properties of dinuclear and one-dimensional-chain ytterbium complexes based on 2-hydroxy-3-methoxybenzoic acid?

Inorganic Chemistry Frontiers Pub Date: 2020-07-14 DOI: 10.1039/D0QI00628A

Abstract

The electronic [Xe]4f13 configurations of Yb(III) ions generate a variety of electronic energy levels, resulting in the fantastic optical and magnetic multifunctional properties of Yb(III) complexes. Here, 2-hydroxy-3-methoxy benzoic acid (H2MBA) was used to construct two dinuclear and one-dimensional Yb(III) complexes namely [Yb2(HMBA)2(MBA)2(DMF)2(H2O)2]·6H2O (1, DMF = N,N-dimethylformamide) and [NH4][Yb(HMBA)4] (2). Fluorescence measurements reveal that H2MBA can sensitize the characteristic near-infrared luminescence of Yb(III). Magnetic susceptibility measurements show that the two Yb(III) complexes are field-induced single-molecule magnets (SMMs) with anisotropy barriers of 18(1) cm?1 and 20(1) cm?1 for 1 and 2, respectively. The magnetism–luminescence–structure correlations as well as relaxation pathways are investigated by ab initio calculations and fluorescence spectrometry.

Graphical abstract: Understanding the near-infrared fluorescence and field-induced single-molecule-magnetic properties of dinuclear and one-dimensional-chain ytterbium complexes based on 2-hydroxy-3-methoxybenzoic acid
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