Synthesis and characterization of Na+ and Ba2+ complexes with some lipophilic diaza-18-crown-6 derivatives

The solid and stable Na+ and Ba2+ complexes of 7,16-Dibenzyl-4,7,10,13-tetraoxa-7, 16-diazacyclooctadecane; 7, 16-Dihexyl-4,7,10,13-tetraoxa-7,16-diazacyclooctadecane; 7,16-Dihep-tyl-4,7,10,13-tetraoxa-7,16-diazacyclootadecane, 7,16-Dioctyl-4,7, 10,13-tetraoxa-7, 16-diazacycloctadecane; 7,16-Dinon yl-4,7,10,13 -tetraoxa-7,16-diazacyclooctadecane; 7,16-Didodecyl-4,7, 10, 13-tetraoxa-7,16-diazacyclooctadecane were prepared. The complexes were investigated using Elemental Analysis, IR, H-1 NMR, C-13 NMR spectroscopy. H-1 and C-13 chemical shifts observed in complexes are discussed in terms of conformational changes on the macrocycles.