Single-molecule junctions of π molecules

2018 ◽  
Vol 2 (2) ◽  
pp. 214-218 ◽  
Author(s):  
Y. Komoto ◽  
S. Fujii ◽  
M. Kiguchi
Keyword(s):  
Intermolecular Interaction ◽  
Single Molecule ◽  
Intrinsic Properties ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction

An investigation on a single-molecule junction reveals the intrinsic properties of a π molecule without the effect of intermolecular interaction and also uncovers its unique properties.

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>

Kinetic investigation of a chemical process in single-molecule junction

2020 ◽  
Vol 56 (2) ◽  
pp. 309-312 ◽  
Author(s):  
Yusuke Hasegawa ◽  
Takanori Harashima ◽  
Yuki Jono ◽  
Takumi Seki ◽  
Manabu Kiguchi ◽  
...  
Keyword(s):  
Single Molecule ◽  
Chemical Process ◽  
Kinetic Investigation ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction

Herein, we report on the kinetic investigation for the breakdown of single-molecule junctions.

scholarly journals Gating of single molecule junction conductance by charge transfer complex formation

Nanoscale ◽  
2015 ◽  
Vol 7 (45) ◽  
pp. 18949-18955 ◽  
Author(s):  
Andrea Vezzoli ◽  
Iain Grace ◽  
Carly Brooke ◽  
Kun Wang ◽  
Colin J. Lambert ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Complex Formation ◽  
Single Molecule ◽  
Charge Transfer Complex ◽  
Single Molecule Junctions ◽  
Aromatic Donor ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
Junction Conductance

Tetracyanoethene complexation boosts the conductance of metal |molecule| metal single molecule junctions involving suitable aromatic donor moieties by about 20-fold.

scholarly journals 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>

Single-molecule junctions for molecular electronics

2016 ◽  
Vol 4 (38) ◽  
pp. 8842-8858 ◽  
Author(s):  
Yuki Komoto ◽  
Shintaro Fujii ◽  
Madoka Iwane ◽  
Manabu Kiguchi
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Unique Structure ◽  
Nano Material ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
Low Dimensional

A single-molecule junction shows novel functionalities caused by its unique structure of a low-dimensional nano-material with two metal–molecule interfaces.

scholarly journals Electronic conduction during the formation stages of a single-molecule junction

2018 ◽  
Vol 9 ◽  
pp. 1471-1477 ◽  
Author(s):  
Atindra Nath Pal ◽  
Tal Klein ◽  
Ayelet Vilan ◽  
Oren Tal
Keyword(s):  
Single Molecule ◽  
Electronic Transport ◽  
Noise Analysis ◽  
Atomic Scale ◽  
Single Atom ◽  
Inelastic Electron ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
Silver Electrodes

Single-molecule junctions are versatile test beds for electronic transport at the atomic scale. However, not much is known about the early formation steps of such junctions. Here, we study the electronic transport properties of premature junction configurations before the realization of a single-molecule bridge based on vanadocene molecules and silver electrodes. With the aid of conductance measurements, inelastic electron spectroscopy and shot noise analysis, we identify the formation of a single-molecule junction in parallel to a single-atom junction and examine the interplay between these two conductance pathways. Furthermore, the role of this structure in the formation of single-molecule junctions is studied. Our findings reveal the conductance and structural properties of premature molecular junction configurations and uncover the different scenarios in which a single-molecule junction is formed. Future control over such processes may pave the way for directed formation of preferred junction structures.

scholarly journals Single-molecule junction spontaneously restored by DNA zipper

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Takanori Harashima ◽  
Shintaro Fujii ◽  
Yuki Jono ◽  
Tsuyoshi Terakawa ◽  
Noriyuki Kurita ◽  
...  
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Structural Changes ◽  
Electrical Measurements ◽  
Static Structure ◽  
Electrical Failure ◽  
Molecular Length ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction

AbstractThe electrical properties of DNA have been extensively investigated within the field of molecular electronics. Previous studies on this topic primarily focused on the transport phenomena in the static structure at thermodynamic equilibria. Consequently, the properties of higher-order structures of DNA and their structural changes associated with the design of single-molecule electronic devices have not been fully studied so far. This stems from the limitation that only extremely short DNA is available for electrical measurements, since the single-molecule conductance decreases sharply with the increase in the molecular length. Here, we report a DNA zipper configuration to form a single-molecule junction. The duplex is accommodated in a nanogap between metal electrodes in a configuration where the duplex is perpendicular to the nanogap axis. Electrical measurements reveal that the single-molecule junction of the 90-mer DNA zipper exhibits high conductance due to the delocalized π system. Moreover, we find an attractive self-restoring capability that the single-molecule junction can be repeatedly formed without full structural breakdown even after electrical failure. The DNA zipping strategy presented here provides a basis for novel designs of single-molecule junctions.

Phosphindole fused pyrrolo[3,2-b]pyrroles: a new single-molecule junction for charge transport

2019 ◽  
Vol 48 (19) ◽  
pp. 6347-6352
Author(s):  
Di Wu ◽  
Jueting Zheng ◽  
Chenyong Xu ◽  
Dawei Kang ◽  
Wenjing Hong ◽  
...  
Keyword(s):  
Charge Transport ◽  
Single Molecule ◽  
High Thermostability ◽  
New Family ◽  
Luminescence Efficiency ◽  
Molecule Junction ◽  
Single Molecule Junction

A new family of phosphindole fused ladder-type heteroacenes with a pyrrolo[3,2-b]pyrrole core were synthesized and characterized, which show good luminescence efficiency, high thermostability and tunable conductance.

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