Qiang Zeng
University of Reading
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Publication
Featured researches published by Qiang Zeng.
Journal of the American Chemical Society | 2015
Henrry M. Osorio; Samantha R. Catarelli; Pilar Cea; Josef B. G. Gluyas; František Hartl; Simon J. Higgins; Edmund Leary; Paul J. Low; Santiago Martín; Richard J. Nichols; Joanne Tory; Jens Ulstrup; Andrea Vezzoli; David C. Milan; Qiang Zeng
Electrochemical gating at the single molecule level of viologen molecular bridges in ionic liquids is examined. Contrary to previous data recorded in aqueous electrolytes, a clear and sharp peak in the single molecule conductance versus electrochemical potential data is obtained in ionic liquids. These data are rationalized in terms of a two-step electrochemical model for charge transport across the redox bridge. In this model the gate coupling in the ionic liquid is found to be fully effective with a modeled gate coupling parameter, ξ, of unity. This compares to a much lower gate coupling parameter of 0.2 for the equivalent aqueous gating system. This study shows that ionic liquids are far more effective media for gating the conductance of single molecules than either solid-state three-terminal platforms created using nanolithography, or aqueous media.
Journal of Physical Chemistry A | 2013
Peter Portius; Martin Davis; Rory Campbell; František Hartl; Qiang Zeng; Anthony J. H. M. Meijer; Michael Towrie
p-(Dimethylamino)phenyl pentazole, DMAP-N5 (DMAP = Me2N-C6H4), was characterized by picosecond transient infrared spectroscopy and infrared spectroelectrochemistry. Femtosecond laser excitation at 310 or 330 nm produces the DMAP-N5 (S1) excited state, part of which returns to the ground state (τ = 82 ± 4 ps), while DMAP-N and DMAP-N3 (S0) are generated as double and single N2-loss photoproducts with η ≈ 0.14. The lifetime of DMAP-N5 (S1) is temperature and solvent dependent. [DMAP-N3](+) is produced from DMAP-N5 in a quasireversible, one-electron oxidation process (E1/2 = +0.67 V). Control experiments with DMAP-N3 support the findings. DFT B3LYP/6-311G** calculations were used to identify DMAP-N5 (S1), DMAP-N3(+), and DMAP-N in the infrared spectra. Both DMAP-N5 (S1) and [DMAP-N5](+) have a weakened N5 ring structure.
Inorganic Chemistry | 2016
Ross J. Davidson; Oday A. Al-Owaedi; David C. Milan; Qiang Zeng; Joanne Tory; František Hartl; Simon J. Higgins; Richard J. Nichols; Colin J. Lambert; Paul J. Low
The single molecule conductances of a series of bis-2,2:6,2″-terpyridine complexes featuring Ru(II), Fe(II), and Co(II) metal ions and trimethylsilylethynyl (Me3SiC≡C-) or thiomethyl (MeS-) surface contact groups have been determined. In the absence of electrochemical gating, these complexes behave as tunneling barriers, with conductance properties determined more by the strength of the electrode-molecule contact and the structure of the linker than the nature of the metal-ion or redox properties of the complex.
Coordination Chemistry Reviews | 2015
Qiang Zeng; Frank W. Lewis; Laurence M. Harwood; František Hartl
Organometallics | 2014
Qiang Zeng; Joanne Tory; František Hartl
Organometallics | 2014
Martina Bubrin; David Schweinfurth; Fabian Ehret; Stanislav Záliš; Hana Kvapilová; Jan Fiedler; Qiang Zeng; František Hartl; Wolfgang Kaim
Organometallics | 2013
Kevin B. Vincent; Qiang Zeng; Matthias Parthey; Dmitry S. Yufit; Judith A. K. Howard; František Hartl; Martin Kaupp; Paul J. Low
European Journal of Inorganic Chemistry | 2014
Anita Grupp; Martina Bubrin; Fabian Ehret; Qiang Zeng; František Hartl; Hana Kvapilová; Stanislav Záliš; Wolfgang Kaim
European Journal of Inorganic Chemistry | 2012
Qiang Zeng; Mahdi Messaoudani; Antonín Vlček; František Hartl
Journal of Organometallic Chemistry | 2016
Kevin B. Vincent; Joseph B. G. Gluyas; Simon Gückel; Qiang Zeng; František Hartl; Martin Kaupp; Paul J. Low