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Ag/AgCl), depending on the pH and on the substituent’s nature.
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Current/voltage curves recorded at various pH values also indicate that only a cationic monoprotonated species undergoes irreversible reduction at potential values spanning the range − 0.9 V to − 1.3 V (vs. UV–vis spectra recorded at various pH values showed that the substitution pattern at the bicycle strongly affects the absorption and emission properties of the triazoles. Acid–base titrations, volumetric or coulometric, have been performed. dm−3 NaCl as ionic medium, at 25 ☌, have been investigated.The hydrolysis reactions of triazolo–triazole derivatives, which are characterized by the presence of substituents of different electronic character (electron donor or acceptor) on the bicycle, in 0.5 mol In vitro tests confirmed the general antiproliferative activity of triazolo-triazole compounds and the importance of substitution in position 7 for their selectivity. Altogether, five different tautomers/conformers of the ligand were isolated and characterized.
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Upon metal coordination, the neutral ligand switches from 2H/s-trans to 3H/s-cis tautomer/conformer forming five-membered chelate rings, while the anionic deprotonated ligand forms six-membered chelate rings in the s-trans conformation. Different coordination modes have been evidenced for the neutral and deprotonated ligand.
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Single crystal X-ray analysis of the free neutral ligand (2H/s-trans tautomer/conformer), and of its singly protonated (2H-3H/s-trans), doubly protonated (2H-3H-7H/s-trans) and deprotonated forms showed that the influence of the pyrazine ring on the triazolo-triazole system is mainly as electron withdrawing and chelating group, and proton acceptor. Computational studies were performed in order to evaluate the stability of the different tautomers/conformers of the ligand, and the proton position in the neutral and acidic forms. The results showed amphoteric behavior and the formation of stable complexes with Cu(II) and Zn(II) in pH intervals in which the ligand is neutral or deprotonated. Atomic force microscopy images are also exploited to support the relationship between the semiconductor morphology and the electrical parameters.Ī new N-rich triazolo-triazole derivative, 4-methyl-7-(pyrazin-2-yl)-2H-triazolotriazole (C8H7N7), bearing a pyrazine residue at 7-position of the triazolo-triazole bicycle, was synthesized, and its acid–base and metal coordination properties were evaluated in solution. This is necessary to improve performance and stability in the case, like this one, of a novel organic semiconductor being employed. The model proposed here to describe the equivalent metal–insulator–semiconductor (MIS) capacitor enables the extraction of a wide range of parameters and the study of the physical phenomena occurring in the transistors: diffusion of mobile ions through the insulator, charge trapping at the interfaces, dispersive transport in the semiconductor, and charge injection at the metal contacts. It is shown that the admittance spectroscopy used together with a properly developed electrical model turns out to be a particularly appropriate technique for correlating the performance of devices based on new materials in the manufacturing methods. In this paper, organic thin film transistors with different configurations are fabricated, and the effect on their performance when tailoring the semiconductor/insulator and semiconductor/contact interfaces through suitable treatments is analyzed.