Electrical properties of poly(tetrathiafulvalenes)

Gruber, H.; Patzsch, J.; Schrödner, M.; Roth, H.-K.; Fanghänel, E.

doi:10.1016/0379-6779(91)91374-j

Cited by 2 publications

(1 citation statement)

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“…Considerable efforts have been made to prepare conjugated materials incorporating tetrathiafulvalene (TTF) units in oligomeric or polymeric structures with the objective to combine the electronic conductive properties of TTF radical salts with the processability of a polymer matrix …”

Section: Introductionmentioning

confidence: 99%

Poly(dibenzylidenetetrathiapentalene): A Redox-Active, Linearly Extended TTF Polymer

et al. 2002

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The π-conjugated polymers poly-1 and poly-2 composed of vinylogous tetrathiafulvalene (TTF) units were obtained by electrochemical polymerization of 2,5-di(benzylidene)-1,3,4,6-tetrathiapentalene (1) or of its corresponding dimer 1,2-bis(5-benzylideneThe polymers were characterized by cyclic voltammetry (CV), in situ ESR spectroscopy and in situ conductivity measurements to gain insight into the charge-discharge behavior and the electronic properties as a function of applied potential. Our results suggest that both compounds behave as conducting polymers exhibiting multistep redox activity. In situ ESR studies show that charge-discharge phenomena differ in the nature of the charge storage configuration depending on whether they are investigated during a cathodic or anodic scan. Reduction of a polymer film generated at an applied potential of +1.6 V vs SCE allows for the detection of three clearly discernible maxima of the spin density at 0.60, 0.95, and about 1.25 V vs Ag, while subsequent reoxidation gives rise to only one spin density maximum at around 0.65 V vs Ag. Coulometric studies suggest that the spin density maximum at around 0.60-0.65 V vs Ag is associated with one positive charge per tetrathiapentalene unit of poly-1 while each monomer bears up to two charges at a potential of 1.6 V vs Ag. In situ and conventional four-probe measurements of the electrical conductivity gave values of around 5 × 10 -5 S cm -1 .

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Section: Introductionmentioning

confidence: 99%