Anion-controlled photochromism of two bipyridinium-based coordination polymers and nondestructive luminescence readout

Abstract

The past ten years have evidenced the rapid development of bipyridinium-based coordination polymers, however, the design and synthesis of photo-switchable luminescent materials with a non-destructive readout capability based on bipyridinium ligands are still at the primary stage. In this work, two new coordination polymers with a bipyridinium-functionalized m-benzenedicarboxyl ligand were synthesized for this purpose. By using anions with different geometries, the molecular linkage and packing structure have been adjusted, and thus allow the two title compounds to exhibit eye-detectable color development with different photoresponsive rates, and distinct luminescence behaviors. Furthermore, compound 2 is the first reported Zn-based luminescent coordination polymer with a non-destructive readout capability. These results can not only help to further understand the structure-photosensitivity relationships of bipyridinium-based systems but also guide the design and synthesis of more luminescent materials with a non-destructive readout capability.

The modulation effect of pi–pi interactions on the electronic and photochromic properties of viologen complexes containing N,N′-bis(carboxyethyl)-4,4′-bipyridinium

“…It is known that for viologen-based compounds the ability of electron transfer from an electron-rich group to an electron-deficient group plays an irreplaceable role in the photo-response rate. 19 The N2–O3 and N2–O4 distances between carboxyethyl and bipyridinium (intramolecule) are 2.691 and 3.602 Å (Fig. S2 † ), respectively, as well as the bond angles C11–N2–O3 and C11–N2–O4 are 86.44° and 108.72°, respectively, in compound 1.…”

Redox-active and Brønsted basic dual sites for photocatalytic activation of benzylic C–H bonds based on pyridinium derivatives

“…S4 †), suggesting that the pyridinium radical can be effectively quenched by molecular oxygen to revert to the pyridinium cationic state and thus complete an electron transfer cycle. 49,50 This oxygen effect can also be clearly observed when irradiating the solution of TTEPY•3Br and ethylbenzene under an air atmosphere. The color of the solution hardly changes, no significant absorption bands appear at 483 and 730 nm in the UV-vis spectra (Fig.…”

Construction of stimuli-responsive materials based on charge transfer and electron transfer

“…图 9 多孔配合物对氨气的吸附响应策略(a), 配合物的氮气 吸附-脱附等温曲线、氨气诱导单晶到单晶转化及伴随的颜 色改变(b) [46] (网络版彩图) 图 7 配合物Cd-Bbc-ox在可见光(a)、紫外光(b)和X射线(c) 照射下的变色现象 [44] (网络版彩图) (e) Co-SN在 不同氨/胺熏蒸及溶剂浸泡下的变色现象 [48] (网络版彩图) 不具有溶致变色能力 [49,50] . [52] (网络版彩图) (c) 锌配合物的可逆荧光开关循环 [53] (网络版彩图) 件, 极大地限制了其的推广和普及 [54] . [55] (网络版 彩图) (简称Cd-Bbc-1) [28] 分别浸泡在含有卤素和拟卤素离子 Zn-L@phenol、Zn-L@catechol、Zn-L@resorci- 图 17 (a) 配合物在[100]方向上的孔道结构; (b) 配合物Mn-Bbc吸附不同客体分子后的变色现象 [58] (网络版彩图) nol、 Zn-L@hydroquinone、Zn-L@o-aminophenol; [59] (网络版彩图) Figure 18 Crystal structures and color changes of Zn-L@Guests [59] (color online).…”