Optical spectroscopy of grafted poly(p-phenyleneethynylene)s in water and water-DMF mixtures

Yiqing Wang, Andrew J. Zappas, James N. Wilson, Ik Bum Kim, Kyril M. Solntsev, Laren M. Tolbert, Uwe H.F. Bunz

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The synthesis and spectral characterization of three grafted poly(p-phenyleneethynylene)s (PPE) are reported. These polymers contain identical chromophores/fluorophores yet show different absorption and emission spectra in DMF and DMF-water mixtures. While some of the spectral properties of the PPEs are ' similar to those of didodecyl-PPE, their spectroscopic properties in DMF-water mixtures differ significantly from those of didodecyl-PPE in CHCl3. An example is the lactide-substituted PPE, which shows absorption spectra that are reminiscent of those obtained for didodecyl-PPE in poor solvents but emission spectra that resemble those of didodecyl-PPE in a good solvent. Emission shifts occur in these PPEs when going from DMF to water. In the case of the lactide-PPE, a surprising hypsochromic emission shift of 10 nm is observed. This apparent shift is attributed to the preferred aggregation and self-quenching of the longer chains, leaving shorter, blue-emissive chains nonaggregated.

Original languageEnglish (US)
Pages (from-to)1112-1117
Number of pages6
JournalMacromolecules
Volume41
Issue number4
DOIs
StatePublished - Feb 26 2008
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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