N-Substituted-3-aminopropylsilsesquioxanes: synthesis, physicochemical properties, and application / M. E. Evseev, A. S. Kholmogorova, L. K. Neudachina [et al.] // Russian chemical bulletin. - 2021. - Vol. 70, № 6. - P1154-1160 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): SILSESQUIOXANES -- SOL-GEL -- CARBON PASTE ELECTRODES -- RUBEANIC ACID -- DETERMINATION OF SILVER(I) Аннотация: Synthesis and study of the physicochemical properties of silsesquioxanes modified with 3-aminopropyl, 2-aminoethyl-3-aminopropyl, and dithiooxamide groups was carried out. The obtained sorbents were characterized by thermal stability, porosity, and a high degree of functionalization; the concentration of groups grafted to the particle surface reached 2.80 mmol g−1. Modified silsesquioxanes were used as an electroactive substance for the development of indicator carbon paste electrodes (CPEs). When using a CPE with a 5% dithiooxamidated silsesquioxane content, the conditions selected for potentiometric titration of aqueous solutions containing silverI were pH 3–4, the titrant was potassium iodide. The designed sensor was successfully tested by analyzing a standard sample and a drug for silver ion content. |