Ladder-type conjugated molecules as robust multi-state single-molecule switches

Synthesis and exceptional operational durability of polyaniline-inspired conductive ladder polymers

“…4,29 More recently, single-molecule junction study on a similar small molecular model TolMSQ showed robust switching of the single-molecule conductance between the LB, PB, and PS states, among which the PS state exhibited the highest conductance. 30 These findings suggest that ladder-type polyaniline analogues, as a class of robust electronic materials with switchable properties, have highly promising application prospects. However, these applications still face a number of critical challenges.…”

Ballistic Conductance through Porphyrin Nanoribbons

“…Examples include cumulenes, 16,17 oligome-thines, 18,19 oxidized oligophenylene bis(triarylamines), 20 and oligo[n]emeraldines. 21,22 In these cases, however, the chemical stability usually drops rapidly with length, and it will be hard to use these materials in future componentry. Furthermore, a symmetry-breaking Peierls transition occurs beyond a critical length in highly symmetric molecules leading to conductance decay.…”

“…For example, π-conjugated oligomers with negligible bond-length alternation can have slightly positive or slightly negative β values. Examples include cumulenes, , oligomethines, , oxidized oligophenylene bis­(triarylamines), and oligo­[ n ]­emeraldines. , In these cases, however, the chemical stability usually drops rapidly with length, and it will be hard to use these materials in future componentry. Furthermore, a symmetry-breaking Peierls transition occurs beyond a critical length in highly symmetric molecules leading to conductance decay. , Such limitations call for different strategies for producing long, stable, and maximally conducting junctions.…”