New class of metal bound molecular switches involving H-tautomerism
Abstract
A potential end-point in the miniaturization of electronic devices lies in the field of molecular electronics, where molecules perform the function of single components. To date, hydrogen tautomerism in unimolecular switches has been restricted to the central macrocycle of porphyrin-type molecules. The present work reveals how H-tautomerism is the mechanism for switching in substituted quinone derivatives – a novel class of molecules with a different chemical structure. We hence reveal that the previous restrictions applying to tautomeric molecular switches bound to a surface are not valid in general. The activation energy of switching in a prototypical quinone derivative is determined using inelastic electron tunneling. Through computational modeling, we show that the mechanism underlying this process is tautomerisation of protons belonging to two amino groups. This switching property is retained upon functionalization by the addition of side groups, meaning that the switch can be chemically modified to fit specific applications.
Citation
Simpson , G J , Hogan , S W L , Caffio , M , Adams , C J , Fruchtl , H A , van Mourik , T & Schaub , R 2014 , ' New class of metal bound molecular switches involving H-tautomerism ' , Nano Letters , vol. 14 , no. 2 , pp. 634-639 . https://doi.org/10.1021/nl4038517
Publication
Nano Letters
Status
Peer reviewed
ISSN
1530-6984Type
Journal article
Description
R.S. acknowledges the financial support from the Scottish Funding Council through EaStCHEM and SRDG grant HR07003.Collections
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