Two Cd-Based Coordination Frameworks Assembled with the Tri(pyridine-3-yl)amine: Structures, Room-Temperature Phosphorescence, and Photochromism
Xu Jing, Sizhe Li, Yue Lang, Xu Liang, Ani Wang, Song‐De Han, Zhen‐Zhen Xue, Jie Pan
Abstract
The synthesis of two three-dimensional coordination frameworks [CdX 2 (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 Cd 2+ and TPA molecules, with halide anions serving as the μ 2 -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.