In situ scanning tunnelling spectroscopy of inorganic transition metal complexes

Faraday Discussions
T AlbrechtJens Ulstrup

Abstract

Redox molecules with equilibrium potentials suitable for electrochemical control offer perspectives in nanoscale and single-molecule electronics. This applies to molecular but also towards higher sophistication such as transistor or diode function. Most recent nanoscale or single-molecule functional systems are, however, fraught with operational limitations such as cryogenic temperatures and ultra-high vacuum, or lack of electrochemical potential control. We report here cyclic voltammetry (CV) using single-crystal Au(111)- and Pt(111)-electrodes and electrochemical in situ scanning tunnelling microscopy (STM) of a class of Os(II)/(III)- and Co(II)/(III)-complexes, the former novel molecular electronics. The complexes are robust, with ligand groups suitable for linking the complexes to the Au(111)- and Pt(111)-surfaces via N- and S-donor atoms. The data reflect monolayer behaviour. Interfacial ET of the Os-complexes is fast, kET(0) > or = 10(6) s(-1), while the Co-complex reacts much more slowly, kET(0) approximately (1-3) x 10(3) s(-1). In STM of the Os-complexes shows a maximum in the tunnelling current/overpotential relation at constant bias voltage with up to 50-fold current rise. The peak position systematically the bias vo...Continue Reading

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Citations

Sep 4, 2007·The Journal of Chemical Physics·Alexander M Kuznetsov
Nov 10, 2009·The Journal of Chemical Physics·Alexander M KuznetsovJens Ulstrup
Sep 4, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Michael S InkpenNicholas J Long
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Nov 13, 2015·Chemical Communications : Chem Comm·X-S ZhouE Maisonhaute
Oct 22, 2015·Journal of the American Chemical Society·Henrry M OsorioQiang Zeng
Jan 27, 2007·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Nunzio TuccittoAntonino Licciardello
Nov 20, 2008·Small·Mario RubenFerdinand Evers
Mar 17, 2016·Chemical Reviews·Dong XiangXuefeng Guo
Nov 17, 2015·The Journal of Chemical Physics·Ezequiel de la LlaveFederico J Williams
Jul 4, 2015·Chemical Communications : Chem Comm·Thomas NijsThomas A Jung
Mar 4, 2006·Faraday Discussions·Stuart Lindsay
Dec 19, 2014·Chemical Society Reviews·Edmund LearyNazario Martín
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Dec 8, 2010·Nano Letters·Aleksandar P IvanovJoshua B Edel
Dec 21, 2006·Journal of the American Chemical Society·Tim AlbrechtJens Ulstrup
Jun 23, 2007·Journal of the American Chemical Society·Tim AlbrechtJ Ulstrup
May 18, 2006·Journal of the American Chemical Society·Tim AlbrechtJens Ulstrup
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