Synergism of photocycloaddition and photoinduced electron transfer for multi-state responsive materials with high-stability and reversibility

Abstract

Dual-photoresponsive coordination polymer displaying color-distinguishable radical states has been obtained based on the synergism of photocycloaddition and photoinduced electron transfer reactions.

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

“…[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). [62] . (e) 配合物Cd-Bpe在365 nm光照下紫外-可见漫反射光谱及变色现象 [62] (网络版彩图) 的吡啶 环与相邻Hmip − 之间电荷转移作用; (b) 配合物Zn-mip在365 nm光照下的变色及 变形现象; (c) 配合物Zn-mip在365 nm光照下的紫外-可见漫反射光谱变化; (d) 配合物Zn-mip在365 nm光照下的X射线粉末衍 射峰变化 [65] (网络版彩图)…”

“…[62] . (e) 配合物Cd-Bpe在365 nm光照下紫外-可见漫反射光谱及变色现象 [62] (网络版彩图) 的吡啶 环与相邻Hmip − 之间电荷转移作用; (b) 配合物Zn-mip在365 nm光照下的变色及 变形现象; (c) 配合物Zn-mip在365 nm光照下的紫外-可见漫反射光谱变化; (d) 配合物Zn-mip在365 nm光照下的X射线粉末衍 射峰变化 [65] (网络版彩图)…”

Confinement of Pyridine Derivatives into a Metal–Organic Framework Host as Electron Acceptors to Achieve Photoinduced Electron-Transfer

“…Photoinduced electron transfer (ET) is an important process for enzymatic catalysis, , artificial photosystems, − solar energy conversion, and so forth. − Developing new types of investigation models to better understand the ET process associated with both the chemical and biological fields is highly desirable. In the past two decades, metal–organic frameworks (MOFs) with their excellent crystalline nature and designable structure features provide a good platform to investigate the ET mechanism. − The most direct approach to constructing ET photochromic MOFs is adopting electron-deficient ligands exemplified by (bi)­pyridinium as photoactive modules. − An alternative way is constructing an appropriate electron-donor and -acceptor system from nonphotochromic species, such as the metalloviologen complex, by constructing a donor–metal–acceptor system through coordination assembly. − As is known, the monocyclic nitrogen heterocycle ligands, acting as electron acceptors in such mentioned systems, usually have a weaker capacity to stabilize the photoinduced radicals than the high conjugated linkers do in the ET process. However, aminopyridine and pyrazine have been demonstrated to have the ability to stabilize radicals after being coordinated with metal ions. − Although such examples are rare, they set good examples to evoke interest for developing of novel ET photochromic materials.…”

Regulation of Crystal Structures and Solid-State Photoreactivity of Diolefin Coordination Polymers by Carboxylate Ligands

“…They only provide metal centers with one carboxylic group, contributing to assembling zero-dimensional, ,, one-dimensional (1D), ,− and a few two-dimensional (2D) structural motifs in the presence of olefin ligands and metal ions. In contrast, some multidimensional structures are generally constructed with the aid of di/multicarboxylic acids. − The geometry (such as V shape or linear shape) of these aromatic carboxylic acids can fine-tune and even determine structural architectures. By the coregulation of primary and secondary organic ligands, different kinds of structural motifs can undergo various photochemical reactions and further determine different physicochemical properties of CPs to some extent.…”