MOLECULAR-ORGANIZATION OF THE LIPID-BOUND EDTA CHROMIUM(III) COMPLEX

Ethylenediaminetetraacetic acid bound to a lipid (dioctadecyldimethyla mmonium bromide) has been used as an immobilized ligand system for ext racting chromium(III) salts from an aqueous solution. The morphology a nd nature of the aggregation of the metal-ion-bound lipid-ligand compl ex has been studied by transmission electron microscopy and differenti al scanning calorimetry. A strong dependence of the vesicle size on th e gel crystalline phase transition has been observed and the results a re rationalized in terms of higher-ordered packing of the large vesicl es below the phase transition temperatures.