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(Upper) Representation of the donor dye-labeled cylindrical capsule 2D2 and the acceptor dye-labeled hexamer 1A6 and the hybrid capsule 1A.2D. FRET occurs only upon formation of the hybrid assembly. (Lower Left) Fluorescence spectrum of a mixture of pyrene labeled monomer 2D and perylene labeled resorcinarene 1A initially, and after 8 days showing no FRET increase. (Lower Right) Development of FRET with time upon addition of 2,2-paracyclophane as the nucleating guest.
