Synthesis and Characterisation of Extended p-Bonding Systems in Cycloimmonium Ylides Derived from the 4,4’-Bipyridine
摘要:
Disubstituted cycloimmonium ylides derived from the 4,4'-bipyridine with one, two or four ylidic systems in their molecular structure are described as stable compounds. Synthesis of some bridged 1,1'-disubstituted 4,4'-bipyridinium dimethylides in which 1,4- or 1,3-phenylene spacers may be used, provide some new macromolecular cycloimmonium ylides with spatially extended pi-bonding system. These compounds were obtained by the chemical conversion of 4,4'-bipyridinium salts as viologens or bis-viologens, with acylating or carbamoylating agents, in basic media. The characterisation of all compounds has been mainly performed by H-1 and C-13 NMR spectroscopy.
1,3-Dipolar cycloaddition reaction of bipyridinium ylides with the propynamido-β-cyclodextrin. A regiospecific synthesis of a new class of fluorescent β-cyclodextrins
The 1,3-dipolarcycloadditionreaction of bipyridinium ylides with the electron deficient propynamido-β-cyclodextrin was studied. This reaction resulted in the regiospecific formation of a new class of fluorescent β-cyclodextrins. The new fluorophore systems were characterized spectroscopically by their absorption and emission maxima and their quantum yields.
Multi-Stimuli-Responsive Chromic Behaviors of an All–in–One Viologen-Based Cd(II) Complex
作者:Yun Luo、Jia-Pei Liu、Lin-Ke Li、Shuang-Quan Zang
DOI:10.1021/acs.inorgchem.3c02070
日期:2023.9.4
A one-dimensional Cd(II) chain coordination polymer constructed by an electron-deficient viologen-anchored carboxylate ligand was successfully synthesized. Owing to the favorable stimuli-chromic properties of viologen, the title compound shows reversiblephotochromism, thermochromism, electrochromism, and naked-eye-detectable differentiable vapochromic response to different volatile amines. The chromic
成功合成了由缺电子紫精锚定的羧酸配体构建的一维Cd(II)链配位聚合物。由于紫精良好的刺激致变色特性,标题化合物对不同的挥发性胺表现出可逆的光致变色、热致变色、电致变色和肉眼可检测的可微分气致变色响应。其变色行为归因于外部刺激引发的紫精自由基的形成。而对挥发性胺的差异化反应归因于胺的尺寸效应以及紫精单元形成α/β C v –H…N胺相互作用的空间位阻效应,进一步影响电子转移的发生。这种一体式晶体材料可能在光电、可擦无墨印刷、光印刷和挥发性胺检测领域有更实际的应用。
Avram, Ecaterina; Lisa, Gabriela, Revue Roumaine de Chimie, 2008, vol. 53, # 9, p. 759 - 768