By G.W. Gokel
A part of a chain which provides stories of efforts in all components of supramolecular technology, this quantity discusses a number of subject matters within the box.
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Additional info for Advances in Supramolecular Chemistry, Volume 4 (Advances in Supramolecular Chemistry)
These systems are switched "on" only within a concentration window of the guest ion. This design combines features of the Figures 1 and 2. Note that both receptors select the same guest ion (though at different concentrations thresholds). We have tried to symbolize this by showing both receptors with identical hole sizes. However the two receptors have opposite electron transfer properties. Receptor1 supports electron transfer only when it is free of the guest ion and then it serves as an electron donor.
This approach has the reward of versatility. Once synthesized, the receptorl-spacer-receptor 2 system may be combined with any one of several different lumophores with a range of optical properties. Any enthusiasm this may generate must be tempered because this approach can also have its dangers due to Supramolecular Photoionic Devices 35 insufficient selectivities. This notwithstanding, progress is possible on several fronts. For example, the success of ionically switchable PET-based lumophore-spacerreceptor systems 39'4~ can be transplanted into the field of lanthanide delayed luminescence.
5upramolecular Photoionic Devices 37 a)~::RECEPTOR,} SPACERIRECEPTOR2OI * SPACER REcEPToR2C ~ hv~--NN~ RIP b)E ET' RIP MC E EET ~ I BET SO ............................ u= ~ MG So ' ~ MG RIP S,----~ EET~"'JL--- MC So' d) ----. NHa~ luminescence'on' Figure 8. (Continued) This applies when the receptor2 is bound to the guest ion. The lumophore MC state emits luminescence and returns to the ground state of the lanthanide metal ion (MG). When receptor2 is free of guest ions, the MC state is not significantly populated due to the rapid diversion of T1 energy via the electron transfer ET'.