The synthesis and electrochemical study of new electrochromic viologen-based materials
作者:John A. Barltrop、Andrew C. Jackson
DOI:10.1039/p29840000367
日期:——
using electrochemical and spectroscopic techniques. It was determined that the stability of the radical film deposited on cathodic reduction of aqueous solutions of these salts may be strongly influenced by symmetry, steric, and electronic factors. From this basis, it was possible to design a viologen, 1,1′-bis-(2-methylbenzyl)-2-methyl-4,4′-bipyridinium dibromide (9), having electrochromic properties
Heterogeneous viologen catalysts for metal-free and selective oxidations
作者:Shengtai Hou、Nanqing Chen、Pengfei Zhang、Sheng Dai
DOI:10.1039/c8gc03772h
日期:——
type of catalysts exhibited high efficiency in the oxidation of aromatic sulfides/alcohols to sulfoxides/aldehydes, respectively (conversion: >90%, selectivity: >95%). The catalytic performance of PINs originates from the electron-accepting ability of the viologen unit, which can reduce H2O2 into an active species. Especially, the synthesis of PIN catalysts is a one-step simple polymerization reaction
无金属氧化是一种绿色化学过程,已引起催化研究人员的极大关注。然而,大多数氧化过程是由均相的无金属催化剂完成的,而非均相的无金属材料的开发却取得了有限的成功。在这项研究中,以N,N'-二烷基-4,4'-联吡啶鎓单元为非均相紫精型催化剂的聚合离子网络(PINs)在芳族硫化物/醇氧化为亚砜/醛方面分别表现出高效率(转化:> 90%,选择性:> 95%)。PIN的催化性能源于紫精单元的电子接受能力,可以还原H 2 O 2变成一个活跃的物种。特别地,PIN催化剂的合成是在空气中苄基溴和联吡啶之间的一步式简单聚合反应。无金属的非均相特征,高选择性,温和条件(60°C,1 h)以及催化剂的简便制备使当前的选择性氧化方法具有吸引力。
BLACK ELECTROCHROMIC COMPOUND, AND ELECTROLYTE-INTEGRATED RADIATION CURABLE ELECTROCHROMIC COMPOSITION AND ELECTROCHROMIC DEVICE WHICH CONTAIN SAME
申请人:LG ELECTRONICS INC.
公开号:US20190389839A1
公开(公告)日:2019-12-26
The present invention relates to an electrochromic compound, and an electrochromic composition and an electrochromic device, including the same. The electrochromic compound according to the present invention may achieve excellent black coloring effects and excellent curing characteristics, and thus may be used advantageously in an electrochromic device.
Merrifield resin was treated with 4,4′-bipyridine and 2,4′-bipyridine, respectively, to give photochromic materials. On exposure to light, reversible color changes are observable. These resins also serve as indicators because reversible color changes are observable on addition of bases, which deprotonate the benzylic position of the N-benzylpyridinium salts to ylides. These can be detected spectroscopically and by trapping reactions on monomeric model compounds. EPR and HYSCORE measurements in combination with DFT calculations prove that radical species are formed in either case. Evidence is found that the carbanionic centers of the ylide partial structures serve as electron donators in these reversible color changes, thus setting them apart from known photochromic materials.
Phenylboronic acid-terminated viologen-carrying alkyl disulfide (1) and a reference compound 2 were designed and synthesized. Self-assembledmonolayers of 1 on gold electrodes were found to function as a highly sensitive saccharide sensor in aqueous solution.