A Series of 9-Anthracene Carboxylic Acid-Based Lanthanide Binuclear Complexes: Construction, Magnetism, Photoluminescence, and Photochromism

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.

The simultaneous modulation effect of N-substituents on the photochromic and electrochromic properties of naphthalenediimide-based coordination polymers

“…To the best of our knowledge, the sole intermolecular ET or intramolecular ET has been widely studied in viologen derivatives, 64 PMDs, 65 NDIs, 66 PDIs 67 and 9-anthracene carboxylic acid ligand. 68,69 However, the synergistic effect of intermolecular and intramolecular ET has rarely been reported. In general, three paramount factors, the electron-donating ability of EDs, the electron-accepting ability of EAs and the suitable interfacial contacts of EDs/EAs, play important roles in CT, PET and concomitantly photochromic behaviors.…”

Highly proton-conducting lanthanide metal–organic frameworks featuring highly oxygenated ligands with slow magnetic relaxation or magnetocaloric effect

“…51,52 The magnetic interactions between the Ln 3+ ions of the dimer are anticipated to be negligible, owing to the long metal–metal distance and diamagnetic carboxylates as bridges. 53,54 Furthermore, variable-field magnetization was measured for Tb-MOF and Gd-MOF at 1.8 K in the field range of 0–7 T. The magnetization values increase with increasing applied magnetic fields and reach the largest values of 10.91 and 13.24 μ B at 7 T and 1.8 K for Tb-MOF and Gd-MOF , respectively (Fig. S14 and S15, ESI†).…”