Conductance of Single Triangular Dehydrobenzo[12]annulene Derivative Bridged between Au Electrodes

Abstract

A triangular dehydrobenzo[12]annulene (DBA) molecule bridged between Au electrodes was investigated by scanning tunneling microscopy break junction technique. The conductance of the single DBA molecule was determined to be 2.5 × 10−5 G0 (G0 = 2e2/h). Though the DBA has three anchor units which can bind to metal electrodes, the conductance measurement revealed that two of three anchor units per molecule are most likely to bind to the Au electrodes to form a single molecular junction.

Single molecule bridging between metal electrodes

“…A pyridine terminal formed electronic p contact by tripodal structures, and high conductance was realized. The multi-anchoring units have been applied to single porphyrin and triangle molecules 55,56 Li et al investigated the single molecular junction of porphyrin with four identical pyridyl substituents using the STM-BJ technique. The molecule binds to the metal electrode via two parts instead of four, although the molecule has four anchoring parts.…”

Single‐Molecule Sensing of Environmental pH—an STM Break Junction and NEGF‐DFT Approach

“…Previous work investigated the conductance switching effects on single molecules through electrochemical gating, [11][12][13][14][15][16][17][18][19] photo switching, [20][21][22][23][24][25][26][27] and mechanically controlling molecular configurations. [28] The few prior reports of the modulation of molecular conductance through changes in the solution pH show either a small switching effect (on/off ratio of about 2), [29] or the detection of only one state at one pH, presumably the high conductance state, while the conductance value of the second state was not detected, either because a junction could not be formed or the conductance was too low.…”

An Investigation into the Stephens–Castro Synthesis of Dehydrotriaryl[12]annulenes: Factors Influencing the Cyclotrimerization

“…In line with the novel conjugated structure of 1 , [12]DBAs have since been found to function as new types of high spin magnetic,, , 2‐photon absorbers,, liquid crystalline and vesicular materials, gels, platforms for chiral recognition and inclusion, as well as affording stacked charge transfer arrays, novel charge transport materials with potential for use as organic semiconductors,, , , and porous networks which absorb CO 2 gas , …”