Poly(diphenylacetylene)s with Electron‐Donating Alkoxy and Electron‐Withdrawing Fluoroalkyl Groups: Effect of the Substituent on Fluorescence

Abstract

New poly(diphenylacetylene)s with alkoxy and fluoroalkyl groups as electron‐donating and electron‐withdrawing groups, respectively, were synthesized by using a WCl6‐n‐Ph4Sn catalyst. The polymer solutions emitted strong, bluish‐green lights when photo‐excited. The polymers that contained the electron‐donating alkoxy groups showed longer fluorescence‐maximum peaks when compared to the polymers that contained the electron‐withdrawing fluoroalkyl groups. However, such an effect of the substituent on the absorption property was not clearly seen. The emission bands of the solid films did not show any significant red shift, relative to that of the dilute solution.magnified image

Ionic Polyacetylene with Aromatic Functional Groups: Synthesis and Properties

“…Unfortunately, applications of this promising material have remained limited because the polymer is insoluble, infusible and thermally unstable. In order to overcome these problems, a number of mono‐ and di‐substituted PAs has been prepared by simple linear polymerization of the corresponding acetylene monomers through various catalyst systems 1–5, 10–16. The resulting polymers, having a conjugated backbone, are expected to exhibit unique properties, such as electrical conductivity, paramagnetism, migration, energy transfer, color, chemical reactivity and complex formation ability 2.…”

Substituted Polyacetylenes: Synthesis, Properties, and Functions

“…78 They studied also the effect of alkyl chain length of poly(diphenylacetylene) derivative 15 to find that 16 displays strong blue-green emission being promising as a PL material. 79 Yang et al fabricated an EL device composed of ITO/ PEDOT/diphenylacetylene copolymer 17/Ca/Al and observed very high device performance with a maximum luminescence of 4230 cd/m 2 at 14 V and a maximum current efficiency of 3.37 cd/A at 7 V. 80 Polymer 18 forms a highly ordered lyotropic nematic liquid crystalline (LC) phase. 81,82 The LC state generates circularly polarized luminescence (CPL) of large emission dissymmetry factor of 10 ¡1 , which will be useful for future optoelectronic devices.…”

Polymerization of substituted acetylenes and features of the formed polymers

“…New poly(diphenylacetylene)s with alkoxy, silyl and fluorine groups (e.g., 40 in Chart 18) have been synthesized using W and Ta catalysts. 143 The polymer solutions emit a strong bluish-green light when photoexcited. The polymers containing electrondonating alkoxy groups show slightly longer fluorescence maxima compared to the polymers with the electron-withdrawing fluorine atoms.…”