Molecular Wire Effects in Phenyleneethynylene Oligomers: Surprising Insights. Issue 13 (6th February 2018)

• Record Type: Journal Article
• Authors: Hergert, Marcel; Bender, Markus; Seehafer, Kai; Bunz, Uwe H. F.
• Is Part Of: Chemistry. Volume 24:Issue 13(2018)
• Page Start: 3132
• Page End: 3135
• Publication Date: 2018-02-06
• Subjects: molecular wires -- oligo(phenyleneethynylene) -- poly(para-phenyleneethynylene) -- quenching -- sensors; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201705604
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: The synthesis and quenching behavior of a series of water‐soluble, carboxylate‐carrying phenyleneethynylene oligomers—monomer to tetramer—and their polymers are reported; their quenching behavior with different test analytes (paraquat, lead salts, mercury salts, picric acid, methylpyridinium iodide) in water were investigated, and the results were compared to that of the conjugated polymer. Significant but analyte‐dependent enhancement effects were found. For monovalent quenchers, only the molecular wire effect applies, but for divalent quenchers multivalency effects are also important. Abstract : Size does matter, charge does matter : Fluorescence quenching of a series of phenyleneethynylene oligomers by using different quenchers was investigated; data showed different enhancement mechanisms depending on the charge and the chemical nature of the quencher (see figure).