MOF structure (IMAGE) University of California - Berkeley Caption A cross-section through a porous metal-organic framework, showing the copper atoms (orange) that are constrained in a rigid structure by organic linker molecules, cyclohexanedicarboxylate, that contain oxygen (red) and carbon (gray). Ammonia cleaves the copper-oxygen bonds in this 3D framework, causing it to transform into a one-dimensional polymer. The porous, 3D framework then reassembles itself as ammonia is driven off. Credit Jeffrey Long lab, UC Berkeley Usage Restrictions none 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.