Novel Cruciform Structures as Model Compounds for Coordination Induced Single Molecule Switches

Abstract

We have synthesized various molecular cruciforms consisting of two different crossing π-systems and comprising crosswise arranged thiol- and pyridine-anchor groups. With these model compounds we strive towards the investigation of a new switching concept based on the potential dependent coordination of pyridines to gold electrodes in an electrochemical set-up. Integration of these cruciform molecules between both electrodes of a mechanically controlled break junction in a liquid environment gave insight into their single molecule transport properties. These studies allowed individual transport characteristics to be assigned to the bar subunits of the cruciforms but also revealed the remaining experimental challenges to realize the suggested switching concept.

Three-Terminal Single-Molecule Junctions Formed by Mechanically Controllable Break Junctions with Side Gating

“…Previous efforts to overcome these challenges have coupled an electrochemical gate electrode − or a bottom-gate electrode into a molecular junction. − The electrochemical gate can effectively control the current through the molecules, − but it can only be operated in electrolytes. The bottom gate can directly modulate the molecular orbital electrostatically in a molecular FET contact configuration.…”

Synthesis and antitumor effects of novel benzyl naphthyl sulfoxide/sulfone derivatives derived from Rigosertib

“…The synthetic procedure for the target compounds is described in Scheme 1 in the literature. [22][23][24] Intermediate 9 was prepared from anisic aldehyde (6) by nitration, reduction and 25,26 Intermediates 10a-10b were synthesized from reactions of 5a-5b with 9 in the presence of NaOH. 27 Next, the suldes 10a-10b were oxidized to give the corresponding sulfoxides (11a, 11c) and sulfones (11b, 11d) with H 2 O 2 in acetic acid.…”

Molecular Junctions: From Tunneling to Function

“…We have been exploiting this technique extensively over the past years to determine some of the basic mechanisms at stake in the formation of molecular junctions. [21][22][23][24][25][26][27][28][29] Some examples are provided in the next section.…”