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·dm −3 NaCl as ionic medium, at 25 °C, have been investigated. Acid–base titrations, volumetric or coulometric, have been performed. The pH range investigated is 0.3–12. 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. 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. Ag/AgCl), depending on the pH and on the substituent’s nature. Particularly, on the fused-ring N-rich bicycle, with pentafluorophenyl as electron withdrawing group, reduction takes place at a potential of 0.05 V higher than the analogue with aminophenyl electron donor group. The mononuclear complexes formation between Cu(II) and a triazolo–triazole compound has been also highlighted by UV–vis spectra and current/voltage curves recorded at 0.3 < pH < 6.

中文翻译：

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三唑并-三唑衍生物和铜（II）配合物的氧化还原和发射特性

以0.5 mol·dm -3 NaCl为离子介质，在25℃条件下，在自行车上存在不同电子特征（电子供体或受体）取代基的三唑并-三唑衍生物的水解反应已得到调查。酸碱滴定，容量或库仑，已进行。研究的 pH 值范围为 0.3-12。在不同 pH 值下记录的 UV-vis 光谱表明，自行车上的取代模式强烈影响三唑的吸收和发射特性。在各种 pH 值下记录的电流/电压曲线还表明，根据 pH 值和取代基的性质，只有阳离子单质子化物质在跨越 - 0.9 V 至 - 1.3 V（相对于 Ag/AgCl）范围的电位值发生不可逆还原. 特别，在稠环富氮自行车上，以五氟苯基作为吸电子基团，在比具有氨基苯基电子供体基团的类似物高 0.05 V 的电位下发生还原。在 0.3 < pH < 6 时记录的 UV-vis 光谱和电流/电压曲线也突出了 Cu(II) 和三唑并-三唑化合物之间形成的单核配合物。