The Role of Symmetry in Single-Molecule Junctions

ChemPhysChem ◽  
2011 ◽  
Vol 12 (16) ◽  
pp. 2887-2889 ◽  
Author(s):  
Emanuel Lörtscher
Keyword(s):  
Single Molecule ◽  
Single Molecule Junctions

Electronic transport in biphenyl single-molecule junctions with carbon nanotubes electrodes: The role of molecular conformation and chirality

2010 ◽  
Vol 82 (8) ◽  
Author(s):  
C. A. Brito Silva ◽  
S. J. S. da Silva ◽  
E. R. Granhen ◽  
J. F. P. Leal ◽  
J. Del Nero ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Molecule ◽  
Electronic Transport ◽  
Molecular Conformation ◽  
Single Molecule Junctions

scholarly journals Role of solvents in the electronic transport properties of single-molecule junctions

2016 ◽  
Vol 7 ◽  
pp. 1055-1067 ◽  
Author(s):  
Katharina Luka-Guth ◽  
Sebastian Hambsch ◽  
Andreas Bloch ◽  
Philipp Ehrenreich ◽  
Bernd Michael Briechle ◽  
...  
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Current Voltage ◽  
Tunnel Barriers ◽  
Single Molecule Junctions ◽  
Level Model ◽  
Current Voltage Characteristics ◽  
Solvent Molecules ◽  
Narrow Gaps

We report on an experimental study of the charge transport through tunnel gaps formed by adjustable gold electrodes immersed into different solvents that are commonly used in the field of molecular electronics (ethanol, toluene, mesitylene, 1,2,4-trichlorobenzene, isopropanol, toluene/tetrahydrofuran mixtures) for the study of single-molecule contacts of functional molecules. We present measurements of the conductance as a function of gap width, conductance histograms as well as current–voltage characteristics of narrow gaps and discuss them in terms of the Simmons model, which is the standard model for describing transport via tunnel barriers, and the resonant single-level model, often applied to single-molecule junctions. One of our conclusions is that stable junctions may form from solvents as well and that both conductance–distance traces and current–voltage characteristics have to be studied to distinguish between contacts of solvent molecules and of molecules under study.

scholarly journals The Role of Oligomeric Gold–Thiolate Units in Single-Molecule Junctions of Thiol-Anchored Molecules

2018 ◽  
Vol 122 (6) ◽  
pp. 3211-3218 ◽  
Author(s):  
Edmund Leary ◽  
Linda A. Zotti ◽  
Delia Miguel ◽  
Irene R. Márquez ◽  
Lucía Palomino-Ruiz ◽  
...  
Keyword(s):  
Single Molecule ◽  
Single Molecule Junctions ◽  
Gold Thiolate

scholarly journals Revealing the Role of Anchoring Groups in the Electrical Conduction Through Single-Molecule Junctions

Small ◽  
2010 ◽  
Vol 6 (14) ◽  
pp. 1529-1535 ◽  
Author(s):  
Linda A. Zotti ◽  
Thomas Kirchner ◽  
Juan-Carlos Cuevas ◽  
Fabian Pauly ◽  
Thomas Huhn ◽  
...  
Keyword(s):  
Single Molecule ◽  
Electrical Conduction ◽  
Single Molecule Junctions ◽  
Anchoring Groups

Mechanically-Tunable Quantum Interference in Ferrocene-Based Single-Molecule Junctions

2020 ◽  
Author(s):  
María Camarasa-Gómez ◽  
Daniel Hernangómez-Pérez ◽  
Michael S. Inkpen ◽  
Giacomo Lovat ◽  
E-Dean Fung ◽  
...  
Keyword(s):  
Single Molecule ◽  
Quantum Interference ◽  
Degrees Of Freedom ◽  
Building Blocks ◽  
Ferrocene Derivative ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
The Impact ◽  
D Orbitals

Ferrocenes are ubiquitous organometallic building blocks that comprise a Fe atom sandwiched between two cyclopentadienyl (Cp) rings that rotate freely at room temperature. Of widespread interest in fundamental studies and real-world applications, they have also attracted<br>some interest as functional elements of molecular-scale devices. Here we investigate the impact of<br>the configurational degrees of freedom of a ferrocene derivative on its single-molecule junction<br>conductance. Measurements indicate that the conductance of the ferrocene derivative, which is<br>suppressed by two orders of magnitude as compared to a fully conjugated analog, can be modulated<br>by altering the junction configuration. Ab initio transport calculations show that the low conductance is a consequence of destructive quantum interference effects that arise from the hybridization of metal-based d-orbitals and the ligand-based π-system. By rotating the Cp rings, the hybridization, and thus the quantum interference, can be mechanically controlled, resulting in a conductance modulation that is seen experimentally.<br>

Charge Transfer Complexation Boosts Molecular Conductance Through Fermi Level Pinning

2018 ◽  
Author(s):  
Kun Wang ◽  
Andrea Vezzoli ◽  
Iain Grace ◽  
Maeve McLaughlin ◽  
Richard Nichols ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Single Molecule ◽  
Quantum Interference ◽  
Transmission Function ◽  
Scanning Tunneling ◽  
Charge Transfer Complexes ◽  
Tunneling Microscopy ◽  
Quantum Interference Effect ◽  
Single Molecule Junctions ◽  
Charge Transfer Complexation

We have used scanning tunneling microscopy to create and study single molecule junctions with thioether-terminated oligothiophene molecules. We find that the conductance of these junctions increases upon formation of charge transfer complexes of the molecules with tetracyanoethene, and that the extent of the conductance increase is greater the longer is the oligothiophene, i.e. the lower is the conductance of the uncomplexed molecule in the junction. We use non-equilibrium Green's function transport calculations to explore the reasons for this theoretically, and find that new resonances appear in the transmission function, pinned close to the Fermi energy of the contacts, as a consequence of the charge transfer interaction. This is an example of a room temperature quantum interference effect, which in this case boosts junction conductance in contrast to earlier observations of QI that result in diminished conductance.<br>

The localized electron: magnetic properties

2018 ◽  
Author(s):  
Jean-Pierre Launay ◽  
Michel Verdaguer
Keyword(s):  
Single Molecule ◽  
Model Systems ◽  
Ferromagnetic Coupling ◽  
Single Chain ◽  
Single Molecule Magnets ◽  
Magnetic Systems ◽  
Orbital Interactions ◽  
Prussian Blue Analogues ◽  
Mononuclear Complexes

After preliminaries about electron properties, and definitions in magnetism, one treats the magnetism of mononuclear complexes, in particular spin cross-over, showing the role of cooperativity and the sensitivity to external perturbations. Orbital interactions and exchange interaction are explained in binuclear model systems, using orbital overlap and orthogonality concepts to explain antiferromagnetic or ferromagnetic coupling. The phenomenologically useful Spin Hamiltonian is defined. The concepts are then applied to extended molecular magnetic systems, leading to molecular magnetic materials of various dimensionalities exhibiting bulk ferro- or ferrimagnetism. An illustration is provided by Prussian Blue analogues. Magnetic anisotropy is introduced. It is shown that in some cases, a slow relaxation of magnetization arises and gives rise to appealing single-ion magnets, single-molecule magnets or single-chain magnets, a route to store information at the molecular level.

Dissecting Contact Mechanics from Quantum Interference in Single-Molecule Junctions of Stilbene Derivatives

Nano Letters ◽  
2012 ◽  
Vol 12 (3) ◽  
pp. 1643-1647 ◽  
Author(s):  
Sriharsha V. Aradhya ◽  
Jeffrey S. Meisner ◽  
Markrete Krikorian ◽  
Seokhoon Ahn ◽  
Radha Parameswaran ◽  
...  
Keyword(s):  
Contact Mechanics ◽  
Single Molecule ◽  
Quantum Interference ◽  
Single Molecule Junctions ◽  
Stilbene Derivatives

scholarly journals Correction: Electronic conductance and thermopower of single-molecule junctions of oligo(phenyleneethynylene) derivatives

Nanoscale ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 4685-4686
Author(s):  
Hervé Dekkiche ◽  
Andrea Gemma ◽  
Fatemeh Tabatabaei ◽  
Andrei S. Batsanov ◽  
Thomas Niehaus ◽  
...  
Keyword(s):  
Single Molecule ◽  
Single Molecule Junctions ◽  
Electronic Conductance

Correction for ‘Electronic conductance and thermopower of single-molecule junctions of oligo(phenyleneethynylene) derivatives’ by Hervé Dekkiche et al., Nanoscale, 2020, 12, 18908–18917, DOI: 10.1039/D0NR04413J.

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