A Series of 9-Anthracene Carboxylic Acid-Based Lanthanide Binuclear Complexes: Construction, Magnetism, Photoluminescence, and Photochromism
Yuhan Wang, Jie Li, Song‐De Han, Chen Jia, Shuai Liang, Ji‐Xiang Hu
Abstract
Photochromic materials, with the changes of their physical and chemical properties under the stimulation of light, have been widely utilized in the fields of optical switches, displays, and molecular devices. Herein, a series of binuclear lanthanide complexes [RE 2 (9-Ac) 6 (DMF) 2 ] (DMF = N, N ′-dimethylformamide; RE = Dy for 1, Gd for 2, Tb for 3, and Y for 4 ) were constructed based on the single ligand of 9-anthracene carboxylic acid (9-HAc). Their crystal structures and magnetic properties were characterized. All the compounds showed radical-actuated photoluminescent and photochromic behavior with the color varied from faint yellow to brown, as confirmed by UV–vis, fluorescence, and electron paramagnetic resonance spectra. Distinct from the photochromic materials governed by photoactive ligands or mixed ligands, this work not only provides a general method for building photochromic materials based on a single ligand but also enriches RE-based photochromic or photoresponsive material systems.