In this work, we describe the synthesis of a novel 9-aminoacridine derivative that presents surprisingly different colors when exposed to neutral, acidic or basic mediums with potential application as pH indicator in organic solvents. Furthermore, pKa and molar absorptivity values were determined and theoretical studies supported by density functional theory (DFT) calculations were performed to elucidate the different structures of this compound.

Os líquidos iônicos (ILs) são sais líquidos a baixas temperaturas, tipicamente com pontos de fusão abaixo de 100 ºC. Nos últimos anos, as propriedades de vários ILs têm sido extensivamente estudadas e, em casos específicos, podem ser considerados como solventes verdes capazes de substituir solventes orgânicos tradicionais. Neste trabalho, ILs derivados de triazol tem sido sintetizados e a solubilidade em diferentes solventes aumenta com a constante dieléctrica dos solventes considerados. Três novos ILs 1,2,3-triazólicos foram utilizados para o pré-tratamento do bagaço de cana. O efeito deste pré-tratamento da biomassa lignocelulósica foi analisado por microscopia eletrônica de varredura, mostrando um aumento da superfície de exposição das amostras de bagaço como alterações estruturais na fibra.

Ionic liquids (ILs) are salts which are liquid at low temperatures, typically with melting points under 100 ºC. In recent years, the properties of many ILs have been extensively studied and have been considered as green solvents capable of replacing traditional organic solvents. Herein, ILs derived from triazole have been synthesized, thus solubility in different solvents increases with the dielectric constant of the considered solvents. Three novel 1,2,3-triazolium-based were used for the pretreatment of sugarcane bagasse. The effect of this pretreatment on lignocellulosic biomass was analyzed by scanning electron microscopy, showing an increase in the exposure surface of the bagasse samples as structural changes in the fiber.