Supramolecular Chemistry of Environmentally Relevant Anions

Tri‐ and Pentacalix[4]pyrroles: Synthesis, Characterization and Their Use in the Extraction of Halide Salts

“…Such materials, based on calix [4]pyrroles, may find utility in addressing a variety of current challenges, including corrosion prevention (e.g., chloride, carbonate, and sulfate control under conditions of combustion [24] ) and waste remediation (e.g., sulfate extraction from tank waste [25] ). Herein, we report the synthesis and characterization of tri-and pentacalix [4]pyrrole precursors, that is, ketone 1 containing an alkyne functional group, calix [4]pyrroles 3 and 5, compound 7, with four azide units connected to the meso-positions of the calix [4]pyrrole-core structure, and oligomeric calix [4]pyrroles 8-11, synthesized by click chemistry.…”

Hexafluorosilicates of bis(aminopyridinium). The relationship between H-bonding system and solubility of salts

“…Contrary to the ''classic'' complexes of transition metals generated due to coordinative covalent bonds the coordination chemistry of anions [4] is based on interionic H-bonds with synthetic organic receptors. The wide range of recently developed anion receptors include amides and thioamides, pyrroles and indoles, ureas and thioureas, ammonium, guanidinium, imidazolium, as well as the receptors with hydroxyl groups [5,6].…”

Perchlorate Selectivity of Anion Exchange Resins as Evaluated Using Ion-Selective Electrodes

“…18 The modern handbooks do not include the coefficient for perchlorate. 19 In this study, we first demonstrated the difficulty in determining the coefficient for perchlorate, which leads to inconsistency of literature data, from the experimental points of view.…”