Host-guest assembly (IMAGE) Tsinghua University Press Caption In the cavity of a molecular framework of multiple negatively charged metal ions and shared oxygen atoms called a polyoxometalate, researchers successfully fabricated a novel multicomponent cluster comprising positively charged ions of iron and cerium and phosphate. The assembly demonstrates enhanced catalytic activity, according to the researchers. Credit Polyoxometalates, Tsinghua University Press Usage Restrictions Credit must be given to the creator. License CC BY 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.