A New Calix[4]pyrrole Derivative and Its Anion (Fluoride)/Cation (Mercury and Silver) Recognition
作者： Angela F. Danil de Namor , Ismail Abbas , Hassan H. Hammud
DOI: 10.1021/JP067798E
关键词: Fluoride 、 Solvent 、 Acetonitrile 、 Alkoxy group 、 Inorganic chemistry 、 Proton NMR 、 Metal 、 Pyrrole 、 Ionic bonding 、 Polymer chemistry 、 Chemistry
摘要: A new calix[4]pyrrole-based macrocycle, meso-tetramethyl-tetrakis{4-[2-(ethylthio)ethoxy]phenyl}calix[4]pyrrole, 7, has been synthesized and fully characterized. Unlike other calixpyrrole derivatives that show selective interaction with anions, 7 described in the present work forms stable complexes both metal cations anions. The thermodynamics of complexation this ditopic derivative (Hg2+ Ag+) fluoride anion nonaqueous solutions have determined by titration calorimetry, host-guest composition investigated using conductance measurements at 298.15 K. 1H NMR studies provide clear evidence about sites ionic species, which NH groups are taking part ligand while sulfur donor atoms responsible for cations. Using data on structurally related analogues (1-6), behavior is discussed comparatively from thermodynamic point view. Possessing four sulfur-containing pendent arms, displays an enhanced hosting ability Hg2+ acetonitrile. As compared 1, derivative, shows a unique among anions acetonitrile dimethyl sulfoxide. far as complex concerned, medium effect assessed terms transfer reactants product (reference solvent) to
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