Two Cd-Based Coordination Frameworks Assembled with the Tri(pyridine-3-yl)amine: Structures, Room-Temperature Phosphorescence, and Photochromism

• Published in: Crystal growth & design 2024-11, Vol.24 (21), p.9163-9172
• Main Authors: Jing, Xue-Mei, Li, Si-Zhe, Lang, Yue, Liang, Xiao-Xing, Wang, Ani, Han, Song-De, Xue, Zhen-Zhen, Pan, Jie
• Format: Article
• Language: English
• ISSN: 1528-7483; 1528-7505
• DOI: 10.1021/acs.cgd.4c01202

The synthesis of two three-dimensional coordination frameworks [CdX2(TPA)] (X = Br for 1 and I for 2) has been achieved through the assembly of tri­(pyridine-3-yl)­amine (TPA) with cadmium halides. The compounds are isostructural, and both are fabricated from the infinite linkage of Cd2+ and TPA molecules, with halide anions serving as the μ2-bridging and terminally coordinated species. Photoluminescence properties of two coordination polymers have been thoroughly examined, revealing room-temperature phosphorescence with unique decay lifetimes. Remarkably, a yellow glow is achieved for the samples owing to the heavy atom effects. A comprehensive structure–property analysis, complemented by theoretical calculations, has been conducted to elucidate the mechanisms underlying fluorescence and phosphorescence. Furthermore, the photochromic behavior of the Cd–Br-based solid, which is based on an electron transfer process, has also been investigated.