Syntheses of amide based anion receptors and investigation of their associations with anions and their molecular structures using proton NMR titration and DFT methods
作者:Korakot Navakhun、Ranu Sawangsri、Vithaya Ruangpornvisuti
DOI:10.1016/j.molstruc.2013.12.060
日期:2014.3
The synthesized disubstituted isophthalamide and pyridine-2,6dicarboxamide derivatives of nine compounds were prepared. Their association constants with tetrabutylammonium fluoride (TBA center dot F), tetrabutylammonium chloride (TBA center dot Cl), tetrabutylammonium bromide (TBA center dot Br), tetrabutylammonium dihydrogenphosphate (TBA center dot H2PO4), tetrabutylammonium hydrogensulphate (TBA center dot HSO4) and tetrabutylammonium nitrate (TBA center dot NO3) were obtained by H-1 NMR titration technique. The optimized structures of compounds 1-9 and their association with F-, Cl-, Br-, H2PO4-, HSO4- and NO3- were obtained using the B3LYP/6-31+G(d) method. The most favorable complex of compound 3 with Br- was found. The high association constants of complexes 1-6 with F- are expected. Associations of all receptors with anions are exothermic and spontaneous reactions. Thermodynamic properties of all associations obtained using B3LYP/6-31+G(d) method are reported. (C) 2013 Elsevier B.V. All rights reserved.