Squeezing Fluorescent Dyes into Nanoscale Containers—The Supramolecular Approach to Radiative Decay Engineering

摘要: Supramolecular radiative decay engineering allows systematic variations of the decayrates, and therefore changes in fluorescence lifetimes intensities. Depending on whetherfluorescent dyes are immersed macrocyclic host molecules with low or high polarizability, reducedor enhanced may result. Solvatochromic probes to “measure” thepolarizability inside such molecular container compounds now at hand. Cucurbiturils, for example,are water-soluble molecules, which possess a cavity an exceptionally polarizability,close gas phase. Placing fluorescent cucurbiturils one create aqueoussolution unique microenvironment, approaches that phase leads unprecedentedphotophysical behavior. Accordingly, complexation by cucurbituril prolonged fluorescencelifetimes, 2,3-diazabicyclo[2.2.2]oct-2-ene (DBO) up 1 μs, same as foundin