Novel diacetylenic and polydiacetylenic compositions
申请人:CELANESE CORPORATION
公开号:EP0243807A2
公开(公告)日:1987-11-04
This invention provides a novel case of diacetylenic monomers and corresponding polydiacetylenic polymers.
Illustrative of the invention is a polymer characterized by the repeating unit:
In the form of an optically transparent medium with a noncentrosymmetric alignment of molecules, the polymer exhibits exceptional second order nonlinear optical susceptibility effects.
Red and Near-Infrared Photoluminescence of D-π-A-Type Compounds Based on a 1,4-Diaryl-1-thio-1,3-butadiene Conjugated System in a Dibenzobarrelene Skeleton
作者:Akihiko Ishii、Yukihiro Makishima、Norio Nakata
DOI:10.1021/acs.joc.5b02189
日期:2015.11.20
1,4-Diaryl-1-thio-1,3-butadiene derivatives having a pi-donor dimethylamino group and several pi-acceptor substituents at both terminals of the conjugated system were synthesized by intramolecular [4 + 2] cycloaddition of 1-thio-enynes and subsequent chemical transformations. They displayed largely red-shifted absorption and emission spectra in solution, the powder state, and in polymer films. The derivatives with a 2,2-dicyanoethenyl group as the p-acceptor exhibited inverted solvatochromism in both optical absorption and fluorescence spectroscopies.
Deciphering the Photophysical Role of Conjugated Diyne in Butadiynyl Fluorophores: Synthesis, Photophysical and Theoretical Study
作者:Avik Kumar Pati、Monalisa Mohapatra、Pokhraj Ghosh、Santosh J. Gharpure、Ashok K. Mishra
DOI:10.1021/jp404809g
日期:2013.8.1
The present work focuses on the current interest in diyne bridged chromophores necessitating a clearer understanding of the photophysics of such molecules. The significance of the diyne moiety in the photophysics has been investigated by synthesizing simple substituted diphenyl butadiynyl derivatives following a quick and efficient microwave assisted Eglinton coupling of terminal alkynes. Emission of the fluorophores is observed from the usual locally excited (LE) state and intramolecular charge transfer (ICT) state. Separation of pure ICT emission from pure LE emission has been carried out by Gaussian/Lorentzian curve fitting. The vibronic coupling in the local transitions appears to be confined to the normal mode involving the C-C triple bond stretching of the diyne moiety. This implies that the LE transition involves the diyne moiety, a conclusion supported by quantum chemical calculations. The resolved ICT emission follows double linear dependence on E-T(30) solvent polarity scale. The important role of the diyne moiety in the photophysics of this class of molecules is clearly discernible in this study.