使用基于醌的氯腈/ H +试剂作为可循环使用的有机(无金属)氧化剂体系,可以显示出多种芳基胺进行氧化C-C键形成,以提供联苯胺/萘啶。设计了具有各种取代基的芳胺(3°/ 2°)用于理解氧化二聚作用的空间和电子偏好,并提出了涉及胺自由基阳离子的机理。通过氧化CC偶联获得的四苯基联苯胺衍生物已通过简单的化学转化进一步转化为发射蓝色光的空穴传输材料。这项研究强调了以简单,经济和有效的方式准备新型HTM。
Hierarchical Micro‐ and Mesoporous Zn‐Based Metal–Organic Frameworks Templated by Hydrogels: Their Use for Enzyme Immobilization and Catalysis of Knoevenagel Reaction
作者:Kaipeng Cheng、Frantisek Svec、Yongqin Lv、Tianwei Tan
DOI:10.1002/smll.201902927
日期:2019.10
Encapsulation of enzymes in metal-organicframeworks (MOFs) is often obstructed by the small size of the orifices typical of most reported MOFs, which prevent the passage of larger-size enzymes. Here, the preparation of hierarchical micro- and mesoporous Zn-based MOFs via the templated emulsification method using hydrogels as a template is presented. Zinc-based hydrogels featuring a 3D interconnecting
酶在金属有机框架(MOF)中的封装通常会因大多数报道的MOF典型的孔口小而受阻,从而阻止较大尺寸的酶通过。在这里,介绍了使用水凝胶作为模板通过模板化乳化方法制备分层的微孔和中孔Zn基MOF。具有3D互连网络的锌基水凝胶首先通过三聚氰胺和水杨酸之间氢键的形成而产生,其中锌离子分布良好。与有机接头的进一步配位,然后除去水凝胶模板,产生了同时包含微孔和中孔的分层的基于Zn的MOF。这些新的MOF用于封装葡萄糖氧化酶和辣根过氧化物酶以证明这一概念。固定化酶的kcat / km值为85.68 mm s-1,显示出显着增强的操作稳定性和酶活性。该值比溶液中游离酶的值高7.7倍,比吸附在常规微孔MOF上的酶高2.7倍。已证明中孔共轭物对Knoevenagel反应具有更高的催化活性,因为与使用微孔MOF进行催化所观察到的相比,大孔能够更轻松地进入活性位点。
Multipodal arrangement of push–pull chromophores: a fundamental parameter affecting their electronic and optical properties
作者:M. Klikar、I. V. Kityk、D. Kulwas、T. Mikysek、O. Pytela、F. Bureš
DOI:10.1039/c6nj02994a
日期:——
fundamental properties of 24 push–pull chromophores were investigated by differential scanning calorimetry, electrochemistry, one-photon absorption spectroscopy, photoinduced piezooptics, and were supported by DFT calculations. Thorough structure–property relationships were elucidated, while a significant influence of the structural arrangement/branching on the electronic and opticalproperties has been
In this study, linear absorption, single-photon excited fluorescence, fluorescence quantum yields, fluorescence lifetime and two-photon excited fluorescence of a series of triphenylamine derivatives (L1, L2, L3 and L4) have been measured. L1 and L3 are D-π-A type dyes, while L2 and L4 are D-π-D-π-A type dyes (D = donor, A = acceptor). The investigated compounds consist of triphenylamine-bearing donor-substituted and/or systematically extended π-conjugated length, which are designed to gain insight into the effect of the ethoxyl unit and π-linkage length on the linear and nonlinear optical properties. The influence of solvent polarity on the photophysical properties was investigated. Employing time-dependent density functional theory (TD-DFT) calculations, the structure-property relationships are discussed.
A highly selective and sensitive fluorescent chemosensor for detection of CN<sup>−</sup>, SO<sub>3</sub><sup>2−</sup> and Fe<sup>3+</sup> based on aggregation-induced emission
作者:Xiaodong Yang、Xiuli Chen、Xiaodan Lu、Chenggong Yan、Yikai Xu、Xiaodong Hang、Jinqing Qu、Ruiyuan Liu
DOI:10.1039/c5tc02865e
日期:——
An aggregation-induced emission based sensor that detects CN−, SO32− and Fe3+ in aqueous solution and can be applied in test strips and cellular imaging was designed.