Dexter electron transfer

The Dexter energy transfer, also briefly Dexter Dexter transfer or process called, is a named after David L. Dexter quantum mechanical mechanism of energy transfer between two molecules, which is based on an exchange of electrons. Dexter energy transfer to play a role, inter alia, by the light -harvesting complex photosynthesis and organic semiconductors for the laser or LEDs.

Physics

The Dexter energy transfer is the dominant triplet-triplet energy transfer. Important requirements for the Dexter energy transfer, the overlap of the power functions of the donor and acceptor, and a distance of the donor and acceptor, which is preferably less than 1 nm. The total spin of the donor-acceptor pair is retained.

The energy transfer rate kET decreases exponentially with increasing distance r from the donor and acceptor:

,

Where J is an integral of the overlapping spectra of the donor and acceptor and L is the depth of penetration of the wave function in the environment (van der Waals radius ) is.