Amplified Luminescence Quenching of Phosphorescent Metal–Organic Frameworks

Amplified luminescence quenching has been demonstrated
in metal–organic
frameworks (MOFs) composed of Ru­(II)-bpy building blocks with long-lived,
largely triplet metal-to-ligand charge-transfer excited states. Strong
non-covalent interactions between the MOF surface and cationic quencher
molecules coupled with rapid energy transfer through the MOF microcrystal
facilitates amplified quenching with a 7000-fold enhancement of the
Stern–Völmer quenching constant for methylene blue compared
to a model complex.