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By G.W. Gokel

A part of a chain which offers stories of efforts in all components of supramolecular technology, this quantity discusses quite a few issues within the box.

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Uminescenee ' on' Figure 4. (a) Schematic representation of the orthogonal two-module format of an ionically switchable photoactive dyad. The simple picture presented here in terms of an electron transfer driven by excitation localized in the lumophore is convenient and sufficient for our purposes. A more sophisticated picture acknowledges the importance of twisted internal charge transfer (TICT) excited states in the photophysics of these systems, even those these states are rarely emissive in ionically switchable cases.

27 The powerful electron-accepting capability of pyridinium moieties has previously led to intramolecular fluorescence quenching in anthracene and other derivatives. 128-~3~The strength of this capability permits proton-induced on-off switching with several pyrazoline derivatives including 18 which leads to a wide range of absorption and emission colors. The charge on the pyridinium unit succeeds in perturbing the ICT excited state of the lumophore across the methine spacer which is reflected in the pH-dependent absorption spectra of 18, as seen before in 11 and 12.

PRASANNA DE SILVA ETAL. The vibrancy of integrated systems, as illustrated by these diverse examples, serves as a counterpoint to the more overtly supramolecular systems under discussion in this review. 9. SHIELDED LUMOPHORE-SPACER-RECEPTOR SYSTEMS The modular construction of lumophore-spacer-receptor systems allows the use of intrinsically delicate lumophores since they can be selectively shielded from the ravages of the environment while leaving the receptor exposed for the necessary interaction with guest ions.

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