Diagram (IMAGE) DOE/Sandia National Laboratories Caption This is the key for this image -- M: metal ions; L1,L2: linkers; yellow sphere: guest molecule. The modular, multifunctional structure provides three possible light harvesting mechanisms in MOFs: A) one or more organic linker types within a framework B) light-absorbing guest molecules in the pores; C) charge transfer interactions between guest molecules and MOF linkers that produce new absorption to the red of the isolated guest and linker. Credit Sandia National Laboratories 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.