Increase of conjugation length within SAMs of terthiophene-derivatives, through electrochemical intermolecular coupling

Self-assembly of mono- and multilayers of polyconjugated conducting polymers

“…As a consequence the tail undergoes oxidative demolition instead. This result is in contrast with that reported by Michahlitsch et al, on the behaviour of terthiophene 12 30) . In fact, as already mentioned, this molecule produces dimers via reciprocal b-coupling.…”

“…We have found that in a (41/PAH/PSS/PAH) 15 multilayer the parallel resistance is 1.8 N 10 6 X; this result indicates that the conduction along the polymer layer is scarcely modified by alternating insulating layers. The perpendicular resistance was 2 X for (41/PAH) 30 and 50 X for (41/PAH/PSS/PAH) 15 . These values correspond to a conductivity of 0.01 and 4 N 10 -4 S N cm -1 respectively so that it appears that the anisotropy is low for alternating conducting and insulating monolayers but is significantly high when an insulating PSS/PAH bilayer is interposed between conducting 41/PAH bilayers.…”

“…SA of terthiophene bearing an alkylthiol chain linked to an a-position has been also studied by Michalitsch et al 30) In particular they have synthesised compound 12 in which the thiol group is linked to an hexylic chain. Compound 12 can be adsorbed onto platinum and gold, forming densely packed SAMs, that are electroactive in nonaqueous electrolytes.…”

“…The 41/PAH multilayers were oxidised and therefore conducting. In a (41/PAH) 30 multilayer the parallel resistance was 1.3 N 10 6 X; from this value, and assuming a thickness of 20 Å per layer, a conductivity of 0.03 S N cm -1 was calculated. This value is in very good agreement with that of the film obtained from the same polymer by casting from an aqueous solution 74) .…”

Electropolymerized Self‐Assembled Monolayers of a 3,4‐Ethylenedioxythiophene‐Thiophene Hybrid System

“…The immobilization of electroactive p-conjugated systems on gold surfaces by formation of self-assembled monolayers (SAMs) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] has recently become a focus of high interest motivated by their potential applications in the field of functionalized surfaces, [1] sensors, [2] molecular electronics, [3] or molecular heterojunctions for photovoltaic conversion. [4] On the other hand, several groups have reported the use of surface-immobilized electropolymerizable systems as starting point for the deposition of electrogenerated electroactive conducting polymers.…”