Determination of the pKa of hydroxy-benzophenones in ethanol–water mixtures. Solvent effects

Kinetics modeling and reaction mechanism of ferrate(VI) oxidation of benzotriazoles

“…The absorbencies of BT and DMBT in different pH buffer solutions were determined by a UVeVIS spectrophotometer at the wavelength of 280 nm at room temperature (24 AE 1 C) (Castro et al, 2003;Fagel and Ewing, 1951). For detailed information of determination of pK a values of BT and DMBT, please refer to Supplementary Information, Text S1.…”

Uso de redes neurais recorrentes na determinação das constantes de acidez para a 7-epiclusianona em misturas etanol-água

“…Esta relação linear foi observada em outros sistemas. 45 A Figura 4 apresenta o histograma dos valores de w s pK a obtidos pela inversão, a partir de dados experimentais em um único comprimento de onda, usando as Equações 1-3, 6 e condições descritas anteriormente. Foram obtidos 201 valores de w s pK a com dados experimentais coletados na região entre 250 e 450 nm, com uma média de 5,34 ± 0,32.…”

Ionization constants of all seven positional isomers of quinolinesulfonamides and quinoline-N,N-dimethylsulfonamides

“…Determination of acidity constants could be performed with the experimental procedures based on potentiometric titration [20][21][22][23][24][25][26][27], spectroscopic determination (UV-VIS [20,25,26,[28][29][30][31][32], NMR [33,34] and even EPR [35]), chromatography (RP HPLC [36][37][38][39]) and capillary electrophoresis [25,[40][41][42][43][44][45][46][47][48]. pK a values of sulfonamides were determined both by potentiometric titrations [21][22][23][24] and also by UV-spectroscopic analysis [30].…”