Crossover from single-step tunneling to multistep hopping for molecular triplet energy transfer

Josh Vura-Weis, Sameh H. Abdelwahed, Ruchi Shukla, Rajendra Rathore, Mark A. Ratner, Michael R. Wasielewski

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

Triplet energy transfer (TT), a key process in molecular and organic electronics, generally occurs by either strongly distance-dependent single-step tunneling or weakly distance-dependent multistep hopping. We have synthesized a series of p-stacked molecules consisting of a benzophenone donor, one to three fluorene bridges, and a naphthalene acceptor, and studied the rate of TT from benzophenone to naphthalene across the fluorene bridge using femtosecond transient absorption spectroscopy. We show that the dominant TT mechanism switches from tunneling to wire-like hopping between bridge lengths 1 and 2. The crossover observed for TT can be determined by direct observation of the bridge-occupied state. Copyright Science 2010 by the American Association for the Advancement of Science; all rights reserved.

Original languageEnglish
Pages (from-to)1547-1550
Number of pages4
JournalScience
Volume328
Issue number5985
DOIs
Publication statusPublished - Jun 18 2010

ASJC Scopus subject areas

  • General

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