A benzotriazole and 3-hexylthiophene (3HT) bearing a donor-acceptor-donor (D-A-D) type conjugated polymer (PHTBT) was synthesized. The polymer is both p and n-dopable, fluorescent, soluble in common organic solvents, and processable. Electrochemical and spectroelectrochemical characterization of PHTBT and its photovoltaic performance in organic bulk heterojunction (BHJ) solar cells (SC) have been measured. Using PHTBT as donor material in BHJ solar cells resulted in increased open circuit voltage (V oc ) up to 0.85 V.

Two donor/acceptor/donor‐type pyrrole‐incorporated monomers, 4,7‐di(1H‐pyrrol‐2‐yl)benzo[c][1,2,5]thiadiazole (M1) and 4,7‐di(1H‐pyrrol‐2‐yl)benzo[c][1,2,5]selenadiazole (M2), were synthesized and polymerized electrochemically. The resulting polymers (P1 and P2) were investigated in terms of their electrochromic and optical properties. Spectroelectrochemistry studies revealed that both polymers show two distinct absorptions in both red and blue regions. The absorptions at around 400 and 700 nm correspond to neutral‐state green polymers P1 and P2, which is a unique property for conjugated polymers. Optical band gaps were calculated as 1.12 and 1.08 eV for P1 and P2, respectively. magnified image

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Immobilization of invertase in conducting copolymer matrix of 2,5-di(thiophen-2-yl)-1-p-tolyl-1H-pyrrole with pyrrole (poly(DDTPco-Py)) was achieved via electrochemical polymerization. Kinetic parameters, Michaelis-Menten constant, K m and the maximum reaction rate, V max were investigated. Operational stability and temperature optimization of the enzyme electrodes were also examined.Immobilized invertase reveals maximum activity at 50 • C and; pH 8 and pH 4 for two copolymer matrices. Although the same two monomers are utilized for the copolymer synthesis, the way the copolymer is produced results in quite different responses in terms of enzyme activity, optimum pH and kinetic parameters. Excellent operational stability of the enzyme electrodes enables their repetitive use in the determination of invert sugar.