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Intramolecular delayed fluorescence as a tool for imaging science: Synthesis and photophysical properties of a first-generation emitter

Lookup NU author(s): Professor Andrew Benniston, Emeritus Professor Anthony Harriman, Irantzu Llarena, Craig Sams

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Abstract

The synthesis of a molecular dyad comprising two pyrene-based terminals covalently linked via a Hantzsch 1,4-dihydropyridine is described. The dyad is sufficiently flexible to allow the end groups to approach each other in fluid solution, as is evident from the appearance of excimer fluorescence. Transient absorption spectroscopy indicates that both intra- and intermolecular triplet-triplet annihilation (TTA) takes place at modest laser intensities and leads to delayed fluorescence. The spectral distribution of the delayed fluorescence signal matches that of the excimer. The kinetics of TTA and the overall yield of delayed fluorescence are considered in terms of the molecule adopting disparate conformations that interconvert slowly. Consideration is also given to the possible application of such delayed fluorescence in imaging technology. © 2007 American Chemical Society.

Publication metadata

Author(s): Benniston AC, Harriman A, Llarena I, Sams CA

Publication type: Article

Publication status: Published

Journal: Chemistry of Materials

Year: 2007

Volume: 19

Issue: 8

Pages: 1931-1938

ISSN (print): 0897-4756

ISSN (electronic): 1520-5002

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/cm062525h

DOI: 10.1021/cm062525h

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