Dexter electron transfer

Dexter electron transfer is a quenching mechanism in which an excited electron state transfers from one molecule (a donor) to a second molecule (an acceptor). This process requires a wavefunction overlap between the donor and acceptor, which means it can only occur at short distances; typically of the order 15-20 Å. The excited state may be exchanged in a single step, or in two separate charge exchange steps.

The Dexter energy transfer rate, $k_{ET}$ , is indicated by the proportionality

$k_{ET} \varpropto J \mathrm{exp}\left [ \frac{-2r}{L} \right ]$

where $r$ is the separation of the donor from the acceptor, $L$ is the sum of the Van der Waals radii of the donor and the acceptor, and $J$ is the spectral overlap integral defined by

$J = \int f_{\rm D}(\lambda) \, \epsilon_{\rm A}(\lambda) \, \lambda^4 \, d\lambda$

References

http://dpeecs.nctu.edu.tw/.files/OLED_5.pdf
http://www.iupac.org/goldbook/D01654.pdf

Dexter electron transfer

See also

References