Novel phenoxy and thiophenoxy substituted poly(para-phenylenevinylene)s

Abstract

SUMMARY: Four phenoxy-and two thiophenoxy substituted poly(para-phenylenevinylene)s (PPVs) were prepared via dehydrobromination polycondensation of bis(bromomethyl)benzenes with potassium tert-butoxide. Up to 97% of the resulting PPVs are soluble in common organic solvents and can be processed to high quality thin films by solution casting or spincoating.

Homologous series of alkylsilylphenyl‐substituted poly (p‐phenylenevinylene)s for light‐emitting diodes

“…The drawback of the Gilch polymerization method is that the homogeneous soluble portions proceed together with some insoluble gel portions in phenyl-substituted PPVs. 25,26 However, during the polymerization of our monomer systems, the polymerization mixture became progressively viscous and perfectly homogeneous without any detection of precipitates. The collected polymers were further purified by Soxhlet extraction through MeOH and chloroform to remove the unreacted monomers, oligomers, and inorganic impurities.…”

Synthesis and characterization of a new green‐emitting poly(phenylenevinylene) derivative containing alkylsilylphenyl pendant

“…This phenomenon was attributed to the occurrence of intermolecular aggregation effects. 34,35 All the emission spectra were obtained under excitation at the absorption maximum wavelength of each sample and were independent of the excitation wavelength. The band gap of pSiPhPPV (taken from the ab-sorption spectrum of the film by extrapolation to A ϭ 0 of the low-energy slope) was 2.44 eV.…”

Synthesis and characterization of a new green-emitting poly(phenylenevinylene) derivative containing alkylsilylphenyl pendant

“…However, the PL spectrum of pSiPhPPV in the solid state was also redshifted (Δλ = 38 nm) toward lower energy [λ PL (film) = 524 nm; green; fwhm intensity = 80 nm] compared with the spectrum of pSiPhPPV in solution, which showed the presence of a vibrational fine structure29–33 [λ PL (CHCl 3 ) = 486 nm; greenish blue, fwhm = 47 nm). This phenomenon was attributed to the occurrence of intermolecular aggregation effects 34, 35. All the emission spectra were obtained under excitation at the absorption maximum wavelength of each sample and were independent of the excitation wavelength.…”