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Tuning the Forster overlap integral: energy transfer over 20 Angstroms from a pyrene-based donor to borondipyrromethene (Bodipy)

Lookup NU author(s): Dan Bai, Professor Andrew Benniston, Dr Jerry Hagon, Dr Ross Harrington

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Abstract

A linear molecular dyad was synthesised comprising a pyrene-thiophene energy donor linked via a triazole unit to a borondipyrromethene (Bodipy) energy acceptor. The donor to acceptor separation distance is around 20 angstrom. Emission from the donor originates from a mixed pi-pi* and partial charge-transfer state and overlaps favourably with the absorption profile for the acceptor. The level of spectral overlap is dependent on the solvent polarity. Rates for electronic energy transfer were measured by transient absorption spectroscopy in solvents of varying polarity and refractive index. The measured rates for Forster energy transfer (k(EET)) correlate fairly well with the calculated overlap integrals (J(F)). A sigmoidal relationship is observed between k(EET) and the solvent polarity function Delta F.

Publication metadata

Author(s): Bai D, Benniston AC, Hagon J, Lemmetyinen H, Tkachenko NV, Harrington RW

Publication type: Article

Publication status: Published

Journal: Physical Chemistry Chemical Physics

Year: 2013

Volume: 15

Issue: 24

Pages: 9854-9861

Online publication date: 07/05/2013

Acceptance date: 03/05/2013

ISSN (print): 1463-9076

ISSN (electronic): 1463-9084

Publisher: Royal Society of Chemistry

URL: http://dx.doi.org/10.1039/c3cp50173f

DOI: 10.1039/c3cp50173f

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