Image 2 (IMAGE) The University of Hong Kong Caption The “180°-turn” of the interlocked macrocycles allows the catenane host to switch binding modes to accommodate copper(I) or sulfate ion guests selectively. Image adapted from Nature Communications. Credit The University of Hong Kong Usage Restrictions N/A License Original 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.