Journal of Chemical Sciences

, Volume 119, Issue 2, pp 185-193

First online:

Effect of surfactants on the fluorescence spectra of water-soluble MEHPPV derivatives having grafted polyelectrolyte chains

  • Nagesh KolishettiAffiliated withDepartment of Inorganic and Physical Chemistry, Indian Institute of Science
  • , S RamakrishnanAffiliated withDepartment of Inorganic and Physical Chemistry, Indian Institute of Science Email author 

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Poly(2-methoxy-5-[2′-ethylhexyoxy]-1,4-phenylenevinylene) (MEHPPV) derivatives with polyacrylic acid (PAA) chains grafted onto their backbone were found to be water soluble, and they exhibited a dramatic increase in their fluorescence intensity in the presence of a variety of surfactants, even at concentrations far below their critical micelle concentrations (CMC). This increase was accompanied by a blue-shift in the emission maximum. These observations are rationalized based on the postulate that the backbone conformation of the conjugated polymer is modulated upon interaction of the surfactant molecules with the polyelectrolytic tethers, which in turn results in a significant depletion of intra-chain interchromophore interactions that are known to cause red-shifted emission bands with significantly lower emission yields.


Fluorescence spectra MEHPPV derivatives grafted polyelectrolyte chains