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Electron Tunneling Through Organic Molecules in Frozen Glasses

Wenger, Oliver S. and Leigh, Brian S. and Villahermosa, Randy M. and Gray, Harry B. and Winkler, Jay R. (2005) Electron Tunneling Through Organic Molecules in Frozen Glasses. Science, 307 (5706). pp. 99-102. ISSN 0036-8075. doi:10.1126/science.1103818.

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Reaction rates extracted from measurements of donor luminescence quenching by randomly dispersed electron acceptors reveal an exponential decay constant of 1.23 per angstrom for electron tunneling through a frozen toluene glass (with a barrier to tunneling of 1.4 electron volts). The decay constant is 1.62 per angstrom (the barrier, 2.6 electron volts) in a frozen 2-methyl-tetrahydrofuran glass. Comparison to decay constants for tunneling across covalently linked xylyl (0.76 per angstrom) and alkyl (1.0 per angstrom) bridges leads to the conclusion that tunneling between solvent molecules separated by ∼2 angstroms (van der Waals contact) is 20 to 50 times slower than tunneling through a comparable length of a covalently bonded bridge. Our results provide experimental confirmation that covalently bonded pathways can facilitate electron flow through folded polypeptide structures.

Item Type:Article
Related URLs:
URLURL TypeDescription
Gray, Harry B.0000-0002-7937-7876
Winkler, Jay R.0000-0002-4453-9716
Additional Information:© 2005 American Association for the Advancement of Science. 9 August 2004; Accepted 23 November 2004. We thank J. Kim, J. Lee, and J. Magyar for several helpful discussions. Supported by BP, the NSF (grant no. CHE-0078809), and the Arnold and Mabel Beckman Foundation. O.S.W. acknowledges a postdoctoral fellowship from the Swiss National Science Foundation and B.S.L., a graduate fellowship from the Parsons Foundation.
Funding AgencyGrant Number
Arnold and Mabel Beckman FoundationUNSPECIFIED
Swiss National Science Foundation (SNSF)UNSPECIFIED
Ralph M. Parsons FoundationUNSPECIFIED
Issue or Number:5706
Record Number:CaltechAUTHORS:20141121-140952473
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Official Citation:Wenger, O. S., Leigh, B. S., Villahermosa, R. M., Gray, H. B., & Winkler, J. R. (2005). Electron Tunneling Through Organic Molecules in Frozen Glasses. Science, 307(5706), 99-102. doi: 10.1126/science.1103818
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52054
Deposited On:21 Nov 2014 23:14
Last Modified:10 Nov 2021 19:20

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