偶氮苯是用途广泛的化合物,包括染料和颜料、食品添加剂、指示剂、自由基反应引发剂、分子开关等。在这方面,我们报告了一种使用市售钴(II)合成邻氨基偶氮苯的通用方法) 四苯基卟啉 [CoII(TPP)]。净反应是两个苯基叠氮化物的正式二聚反应,同时损失两个二氮分子。合成偶氮苯最常用的方法是在低温下对芳香伯胺进行初始重氮化,然后与富含电子的芳香亲核试剂反应。因此,这限制了具有胺官能团的偶氮苯的合成。相比之下,我们在此报告的方法在很大程度上依赖于 o-胺部分并将其保留在产品中。该反应是金属催化的,并通过卟啉 Co(III)-硝烯自由基中间体进行,已知它是在钴中心的有机叠氮化物活化时形成的。与没有胺取代基的偶氮苯相比,合成的邻氨基偶氮苯发生红移。基于其中一种产物的晶体结构,偶氮官能团的 N 原子与 NH2 取代基的 H 之间的强 H 键显示稳定产物的反式异构形式。NH2 取代基为合成的偶氮化合物的进
Structure−Reactivity Correlation of Anilines in Acetic Acid
作者:Chockalingam Karunakaran、Ramasamy Kamalam
DOI:10.1021/jo0158433
日期:2002.2.1
The oxidation of aniline in glacial acetic acid with percarbonate, a dry carrier of hydrogen peroxide, is a second-order reaction conforming to the isokinetic relationship. The hitherto followed method of correlation of the reaction rates in terms of the structure-reactivity relationships is unsatisfactory and erroneous. But the reaction rates of molecular anilines, obtained for the first time, conform
[EN] PHOTOALIGNING MATERIALS<br/>[FR] MATÉRIAUX DE PHOTOALIGNEMENT
申请人:ROLIC AG
公开号:WO2013050121A1
公开(公告)日:2013-04-11
The present invention relates to polymer, homo- or copolymer or oligomer for the photoalignment of liquid crystals, especially for the planar orientation of liquid crystals, comprising a main chain and a side chain, wherein the side chain and/or main chain comprises a polar group, compositions thereof, and its use for optical and electro optical devices, especially liquid crystal devices (LCDs).
Emissive Azobenzenes Delivered on a Silver Coordination Polymer
作者:Jingjing Yan、Liam Wilbraham、Prem N. Basa、Mischa Schüttel、John C. MacDonald、Ilaria Ciofini、François-Xavier Coudert、Shawn C. Burdette
DOI:10.1021/acs.inorgchem.8b02845
日期:2018.12.3
aminoazobenzene derivatives and their corresponding silver complexes. Four of the aminoazobenzene ligands, which exhibit no emission under ambient conditions, form silvercoordinationpolymers that are luminescent at room temperature. AzoAEpP (2,2′-bis[N,N′-(4-pyridyl)ethyl]diaminoazobenzene) assembles into a three-dimensional coordinationpolymer (AgAAEpP) that undergoes a reversible loss of emission
由于重氮基的光诱导反式→顺式异构化,偶氮苯已成为功能分子和聚合物材料的普遍成分。相比之下,利用偶氮苯发光的应用很少,因为激发能通常通过非辐射途径消散。受我们对2,2'-双[ N,N' -(2-吡啶基)甲基]二氨基偶氮苯(AzoAM o P)和相关化合物的早期研究的启发,我们研究了一系列五个氨基偶氮苯衍生物及其相应的银配合物。在环境条件下不发射光的四个氨基偶氮苯配体形成在室温下发光的银配位聚合物。偶氮AE pP(2,2'-双[ N,N' -(4-吡啶基)乙基]二氨基偶氮苯)组装成三维配位聚合物(AgAAE p P),添加金属配位后会发生可逆的发射损失分析物,例如吡啶。转换行为与通过配位分析物置换氨基偶氮苯配体驱动的配位聚合物的分解和重新组装是一致的。
Fast Synthesis of Hydrazine and Azo Derivatives by Oxidation of Rare-Earth-Metal−Nitrogen Bonds
作者:Lijun Zhang、Jing Xia、Qinghai Li、Xihong Li、Shaowu Wang
DOI:10.1021/om1009928
日期:2011.2.14
A novel N−N coupling reaction was developed through the oxidation of rare-earth-metal−nitrogen bonds produced by treatment of the easily available rare-earth-metal amides [(Me3Si)2N]3RE(μ-Cl)Li(THF)3 with aromatic primary or secondary amines. The reaction provides the symmetrical or unsymmetrical azo compounds and hydrazinederivatives in good to high yields within a very short time under mild conditions
Crosslinked Polymers with Tunable Coefficients of Thermal Expansion
申请人:National Technology & Engineering Solutions of Sandia, LLC
公开号:US20210387987A1
公开(公告)日:2021-12-16
Curatives and their resulting thermosets and other crosslinked polymers can reduce thermal expansion mismatch between an encapsulant and objects that are encapsulated. This can be accomplished by incorporating a negative CTE moiety into the thermoset resin or polymer backbone. The negative CTE moiety can be a thermal contractile unit that shrinks as a result of thermally induced conversion from a twist-boat to chair or cis/trans isomerization upon heating. Beyond CTE matching, other potential uses for these crosslinked polymers and thermosets include passive energy generation, energy absorption at high strain rates, mechanophores, actuators, and piezoelectric applications.