A sui generis electrode-driven spatial confinement effect responsible for strong twisting enhancement of floppy molecules in closely packed self-assembled monolayers

2018 ◽  
Vol 20 (36) ◽  
pp. 23492-23499 ◽  
Author(s):  
Ioan Bâldea
Keyword(s):  
Charge Transfer ◽  
Chemical Bonding ◽  
Confinement Effect ◽  
Self Assembled Monolayers ◽  
Spatial Confinement ◽  
Specific Chemical ◽  
Assembled Monolayers ◽  
Floppy Molecules ◽  
Self Assembled ◽  
Twisting Angle

Twisting angle enhancement of floppy molecules in closely packed SAMs is a result of electrode-driven space confinement rather than of charge transfer or specific chemical bonding.

Charge transfer in self-assembled monolayers of molecular conductors containing tripodal anchor and terpyridine-metal redox switching element

2021 ◽  
pp. 138302
Author(s):  
Štěpánka Nováková Lachmanová ◽  
František Vavrek ◽  
Táňa Sebechlebská ◽  
Viliam Kolivoška ◽  
Michal Valášek ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Self Assembled Monolayers ◽  
Switching Element ◽  
Molecular Conductors ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Redox Switching ◽  
Metal Redox

scholarly journals Orbital-Dependent Charge Transfer Dynamics in Conjugated Self-Assembled Monolayers

2011 ◽  
Vol 107 (2) ◽  
Author(s):  
H. Hamoudi ◽  
S. Neppl ◽  
P. Kao ◽  
B. Schüpbach ◽  
P. Feulner ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Charge Transfer Dynamics

A surprising way to control the charge transport in molecular electronics: the subtle impact of the coverage of self-assembled monolayers of floppy molecules adsorbed on metallic electrodes

2017 ◽  
Vol 204 ◽  
pp. 35-52 ◽  
Author(s):  
Ioan Bâldea
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Molecular Species ◽  
Molecular Conformation ◽  
Theoretical Work ◽  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Twisting Angle

Inspired by earlier attempts in organic electronics aiming at controlling charge injection from metals into organic materials by manipulating the Schottky energy barrier using self-assembled monolayers (SAMs), recent experimental and theoretical work in molecular electronics showed that metal–organic interfaces can be controlled via changes in the metal work function that are induced by SAMs. In this paper we indicate a different route to achieve interface-driven control over the charge transfer/transport at the molecular scale. It is based on the fact that, in floppy molecule based SAMs, the molecular conformation can be tuned by varying the coverage of the adsorbate. We demonstrate this effect with the aid of benchmark molecules that are often used to fabricate nanojunctions and consist of two rings that can easily rotate relative to each other. We show that, by varying the coverage of the SAM, the twisting angle φ of the considered molecular species can be modified by a factor of two. Given the fact that the low bias conductance G scales as cos2 φ, this results in a change in G of over one order of magnitude for the considered molecular species. Tuning the twisting angle by controlling the SAM coverage may be significant, e.g., for current efforts to fabricate molecular switches. Conversely, the lack of control over the local SAM coverage may be problematic for the reproducibility and interpretation of the STM (scanning tunneling microscope) measurements on repeatedly forming single molecule break junctions.

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