Isomeric Dithienophosphepines: The Impact of Ring Fusion on Electronic and Structural Properties
作者:Kevin Padberg、Johannes D. R. Ascherl、Frank Hampel、Milan Kivala
DOI:10.1002/chem.201905429
日期:2020.3.18
The synthesis and extensive experimental (X-ray crystallography, UV/Vis spectroscopy, cyclic voltammetry) and theoretical (DFT calculations) characterization of two isomeric dithieno[b,f]phosphepines (DTPs) are presented herein. The relative orientation of the phosphepine and the thiophene moieties has a decisive impact on the electronic and structural properties of these compounds. Moreover, the thiophene
seven-membered 8π azepine was employed as a key core of near-infrared (NIR) dyes. The Janus-faced effect of the thiophene-fused structure, which enhances the antiaromaticity of the azepine ring and, at the same time, relieves the antiaromaticity through the deformation from the aromatic thiophene ring to the quinoidal thienyl moiety, is effective to attain the largely red-shifted absorption and emission
Thiophene-Fused Borepins As Directly Functionalizable Boron-Containing π-Electron Systems
作者:David R. Levine、Maxime A. Siegler、John D. Tovar
DOI:10.1021/ja502644e
日期:2014.5.14
preparation of two isomeric dithienoborepins (DTBs), boron-containing polycyclic aromatics featuring the fusion of borepin and thiophene rings. DTBs exhibit reversible cathodic electrochemistry and boron-centered Lewis acidity in addition to enhanced electronic delocalization relative to benzo-fused analogues. Boron's precise position within the conjugation pathway of DTBs significantly affected electronic