Iron-Based MOF (image) University of California - Berkeley Caption This is a cross-section of the iron-based MOF bound to six ethylene molecules, as determined by neutron diffraction. The MOF consists of a carbon (gray) and oxygen (red-orange) framework with iron atoms (yellow-orange) at strategic sites to bind the ethylene carbon atoms. The attraction between the iron and unsaturated hydrocarbons like ethylene (olefins) allows the MOF to adsorb these hydrocarbons, separating them from saturated hydrocarbons (paraffins) even at high temperatures. Credit NIST and Jeffrey Long lab, UC Berkeley Usage Restrictions None 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.