Photoswitchable Catalysts: Correlating Structure and Conformational Dynamics with Reactivity by a Combined Experimental and Computational Approach
作者:Ragnar S. Stoll、Maike V. Peters、Andreas Kuhn、Sven Heiles、Richard Goddard、Michael Bühl、Christina M. Thiele、Stefan Hecht
DOI:10.1021/ja807694s
日期:2009.1.14
one stilbene-derived base. Solid-state structures obtained by X-ray crystal structure analysis confirmed efficient blocking of the active site in the E isomer representing the OFF-states, whereas a freely accessible active site was revealed for a representative Z isomer in the crystal. To correlate structure with reactivity of the catalysts, conformationaldynamics were thoroughly studied in solution
哌啶的 Brønsted 碱性的光控制是通过掺入庞大的偶氮苯基团实现的,并且可以转化为一般碱催化中 ON 和 OFF 状态之间显着的反应性差异。这使得催化剂在硝基醛醇反应(亨利反应)中的活性能够成功地进行光调制。开发了一种光开关催化剂的模块化合成路线,可用于制备和表征三种偶氮苯衍生的碱和一种芪衍生的碱。通过 X 射线晶体结构分析获得的固态结构证实了代表 OFF 状态的 E 异构体中的活性位点的有效阻断,而晶体中具有代表性的 Z 异构体显示了一个可自由访问的活性位点。为了将结构与催化剂的反应性相关联,
Facile Synthesis of Functionalized Bis(arylethynyl)benzene Derivatives via Sila–Sonogashira Reaction
Abstract This article describes a facile synthesis of a new series of symmetrical bis(arylethynyl)benzene derivatives via a one-pot coupling reaction between trialkylsilyl protected arylalkynyes and aryldihalides bearing both electron-withdrawing (EW) and electron-donating groups (ED) in the presence of PdCl2(PPh3)2(5%) / CuI/tetrabutylammonium fluoride / triethylamine / tetrahydrofuran (sila–Sonogashira
The interlocking of twoporphyrin‐based molecular rotors into a bevel‐gear‐shaped structure is demonstrated (see figure). The mechanical interactions between the teeth of the twoporphyrin rotors enabled them to mesh and rotate with almost identical activation energies. Switching the rotational activities of one rotor by using chemical stimulation induced a change in the cooperative rotational motions
Reconfigurable molecules and molecular switches, sensors, and dyes employing the same
申请人:Zhou Zhang-Lin
公开号:US20080269486A1
公开(公告)日:2008-10-30
Various embodiment of the present invention are directed to organic molecules that are reconfigurable under application of an external electric field. One organic molecule embodiment of the present invention has the structure:
where L
1
X
1
and L
2
X
2
are optional connector groups, A represents an electron acceptor group, D represents an electron donor group, R and R′ represent spacer molecules, and R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
, and R
8
represent atoms and hydrocarbons.