Electron transfer in multiply bridged donor-acceptor molecules: Dephasing and quantum coherence

  • Posted on: 10 July 2014
  • By: admin
TitleElectron transfer in multiply bridged donor-acceptor molecules: Dephasing and quantum coherence
Publication TypeJournal Article
Year of Publication2006
AuthorsGoldsmith R.H, Wasielewski M.R, Ratner M.A
JournalJournal of Physical Chemistry B
Volume110
Pagination20258-20262
Date PublishedOct 19
ISBN Number1520-6106
Accession NumberISI:000241192200032
Keywordsconjugated polymer, consequences, fluorescence, interference, photosynthetic reaction centers, resonance, systems, through-bond, transfer rates, wires
Abstract

We present a simple theoretical treatment of nonadiabatic electron transfer in multiply bridged donor-bridge-acceptor molecules using the density matrix formalism. Destructive interference can result from different signed couplings between bridge sites, with the simplest system being a four-site Joachim-type molecular interferometer. Previous work has shown that deposition of energy on the bridge sites erases the interference and recovers transport. We show that pure local dephasing, a completely elastic process, is also capable of eliminating destructive interference and regaining transport. Destructive interference as a result of system connectivity can explain the familiar ortho-meta-para reactivity of benzene bridges. We also show that pure dephasing can yield a coalescence of ortho, meta, and para effective coupling strengths and suggest a system to observe this effect experimentally.

Alternate JournalJ Phys Chem B