Separation: During (IMAGE) University of Pennsylvania Caption Size differences between the neodymium and dysprosium ions mean that ligand-neodymium complexes bind with one another, while their dysprosium counterparts do not. Credit University of Pennsylvania Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.