Understanding Photophysical Effects of Cucurbituril Encapsulation: A Model Study with Acridine Orange in the Gas Phase

摘要: Encapsulation of dyes by cucurbituril macrocycles has proven profitable as a strategy to alter fluorescence characteristics in useful ways. generally results longer lifetimes, enhanced brightness, and solvatochromic effects not normally seen the condensed phase. These have been attributed variously both removal interactions with solvent molecules confined environment extremely low polarizability provided interior. It is difficult disentangle these solution. Here, we present from gas-phase experiments designed separate effects, using cucurbit[7]uril (CB7), cationic dye acridine orange (AOH(+)) probe. Fluorescence properties gaseous AOH(+) are compared those AOH(+)-CB7 complex aqueous The dependence on local several spectroscopic discussed, including excitation emission maxima, size Stokes shift, lifetime relative brightness. An understanding modulation environment, such that promoted this work, will aid rational design improved fluorophores fluorescent sensors.