"Remarkable Photophysics and Amplified Quenching of Conjugated Polyelec" by Fude Feng, Jie Yang et al.

Faculty Publications

Title

Remarkable Photophysics and Amplified Quenching of Conjugated Polyelectrolyte Oligomers

Authors

Fude Feng, †Department of Chemistry and Center for Macromolecular Science and Engineering, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200, United States.
Jie Yang, †Department of Chemistry and Center for Macromolecular Science and Engineering, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200, United States.
Dongping Xie, †Department of Chemistry and Center for Macromolecular Science and Engineering, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200, United States.
Tracy D. McCarley, ‡Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803-1804, United States.
Kirk S. Schanze, †Department of Chemistry and Center for Macromolecular Science and Engineering, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200, United States.

Document Type

Article

Publication Date

5-2-2013

Abstract

We report the photophysics and fluorescence quenching of a series of monodisperse, anionic π-conjugated oligomers that are molecularly dissolved in aqueous solution. These structurally well-defined oligomers feature oligo(phenylene ethynylene) backbones with two -CH2COO(-) units on each repeat unit, with overall lengths of 5, 7, and 9 repeats. The ionic oligomers display a structured fluorescence band with high quantum efficiency in water, in contrast to the low fluorescence quantum efficiency and pronounced aggregation displayed by structurally similar oligomeric and polymeric (phenylene ethynylene) conjugated polyelectrolytes studied previously. Stern-Volmer (SV) fluorescence quenching studies using cationic charge- and energy-transfer quenchers reveal that all of the oligomers give rise to SV quenching constants (KSV) in excess of 10(6) M(-1), with values increasing with oligomer length, consistent with the amplified quenching effect. The amplified quenching effect is proposed to occur due to the formation of comparatively small oligomer aggregates.

Publication Source (Journal or Book title)

The journal of physical chemistry letters

First Page

1410

Last Page

Recommended Citation

Feng, F., Yang, J., Xie, D., McCarley, T. D., & Schanze, K. S. (2013). Remarkable Photophysics and Amplified Quenching of Conjugated Polyelectrolyte Oligomers. The journal of physical chemistry letters, 4 (9), 1410-4. https://doi.org/10.1021/jz400421g

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