摘要:
Adamantane-dipyrromethane (AdD) receptors [di(pyrrole-2-yl)methyladamantane (1), 2,2-di(pyrrole-2-yl)adamantane (2). 1,3-bis[di(pyrrole-2-yl)methyl]adamantane (3). 2,2,6,6-tetra(pyrrole-2-yl)adamantane (4)] form complexes with F-, Cl-, Br-, AcO-, NO3-, HSO4-, and H2PO4- The association constants of the complexes were determined by H-1 NMR titrations, whereas the geometries of complexes 1 F- (2 1), 2 F- (2 1), 2 Cl- (2 1), 2 AcO- (2 1), and 4 F- (1 1) were determined by X-ray structural analysis The most stable complexes are of 2 1 stoichiometry with F- and AcO- The stability constants are in accordance with the anion basicity and the ability of AdD receptors to place the hydrogen bonding donor groups in a tetrahedral fashion around anions The binding energies of the complexes between receptors 1-4 and F- anion are calculated using quantum chemical methods The calculated results show that the solvent polarity is important for the complexation of fluoride ion with AdD receptors 1-4 (C) 2010 Elsevier Ltd All rights reserved