Electrochemical characterisation of poly arylene vinylenes

Abstract

The electrochemical properties of a newly synthesised set of PPV derivatives were measured by cyclic voltammetry. A new octyloxy substituted PPV derivative was first synthesised (POPV). The structure of the POPV is varied systematically by the replacement of the phenyl units by naphthyl and anthryl units and the effect of these variations on the electrochemical properties is explored. The HOMO-LOMO levels of the polymers were determined from the onset potentials for the p-doping and n-doping scans. From this the electrochemical bandgap for each of the polymers was calculated. The systematic change in the structure of the POPV results in a systematic increase in the LOMO level of the polymer series whereas a concomitant increase in HOMO level results in an overall increase in the bandgap of the polymers series. The variation in the electrochemical, optical properties and vibrational properties observed within the polymer series were all found to correlate with the structural changes made, pointing towards structure property relationships and a guide to future synthetic strategies.

A colorimetric and fluorescence “turn-off” chemosensor for the detection of silver ion based on a conjugated polymer containing 2,3-di(pyridin-2-yl)quinoxaline

“…Mg 2+ was added: a positive shift (274 mV) of the reduction potential and a positive shift (127 mV) of the oxidation potential ( Fig. 13) [21].…”

“…Mg 2+ was added, positive shifts of 62 mV (reduction potential) and 26 mV (oxidation potential) were discovered. It is obvious that the changes in cyclic voltammograms of P2 are very small compared to those of P1, indicating that P2 complexes Ag + /Mg 2+ weakly or not at all [21]. The possible mechanism for detecting Ag + is shown in Chart 1.…”

Sterically Encumbered Bipyridyl-Derivatized Conjugated Polymers and Metallopolymers Incorporating Phenylenevinylene, Phenyleneethynylene, and Fluorenylene Segments

“…Ferrocene was added at the end of the experiment as internal reference for the potential. Calculation of ionization energies (IE) and electron affinities (EA) were carried out according to the established convention …”

“…Calculation of ionization energies (IE) and electron affinities (EA) were carried out according to the established convention. 28 Metal Ion Selectivity Methods. A 3.0 mL aliquot of each polymer in tetrahydrofuran solution was measured and added to an optical path length of 1 cm quartz cell.…”

Synthesis and Electropolymerization of 3,5-Bis-(3,4-ethylenedioxythien-2-yl)-4,4-dimethyl Isopyrazole: A Donor-Acceptor-Donor Monomer

“…In addition, the donor and acceptor moieties can be chosen to engineer properties including bandgap, conductivity, absorption color and solubility. 9,11 Recently, a novel D-A-D polymer was reported based on 3,5-bis(thien-2-yl)-4,4-dimethylisopyrazole (BTIPz, Figure 1). 12 The BTIPz monomer was promising because when electropolymerization was accomplished over a broad range, relatively stable n-and p-doping processes were observed, suggesting that transport of both positive and negative ions was occurring throughout the film without significant degradation.…”