Credit: Sandia National Laboratories
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.