Advances in Supramolecular Chemistry, Volume 4 (Advances in - download pdf or read online

By G.W. Gokel

ISBN-10: 0080550894

ISBN-13: 9780080550893

ISBN-10: 1559387947

ISBN-13: 9781559387941

A part of a chain which provides stories of efforts in all parts of supramolecular technology, this quantity discusses quite a few themes within the box.

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Extra info for Advances in Supramolecular Chemistry, Volume 4 (Advances in Supramolecular Chemistry)

Example text

The excitation (,) is delocalized over most, if not all, of the molecular x-electron system. The sole supramolecular aspect of these cases emerges only in terms of binding the guest ion. Furthermore the luminescence of these systems are not generally switchable in an "off-on" or "on--off" sense even though many show intensity variations. Rather, the switching is from one wavelength range to another. Even here, complications emerge and practical cases are uncommon. The common cases, of which there are many, show ion-controlled switching from one wavelength to another in the luminescence excitation spectrum but not in emission.

On the other hand, the PET-type process from the N-phenyl azacrown receptor to the acridinium lumophore in Ag(I)-free 59 is strongly allowed. The tables are turned upon entry of Ag(I) owing to the strong Ag(I)-N interaction. o o hvt~ ! o o, 02" ". 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.

Of course, as implied in part (a), the frontier orbital energies of the receptor are lower than in the corresponding situation of Figure 1. (c) An example illustrating the principles of parts (a) and (b) from the 1,3 diarylpyrazolin-5-yl benzoate family. The luminescence is switched "on" when the carboxylate group is unprotonated. At sufficiently high proton concentrations the carboxylate group is protonated and the luminescence is switched "off". Nevertheless, the example 17 has been available since 1989.

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Advances in Supramolecular Chemistry, Volume 4 (Advances in Supramolecular Chemistry) by G.W. Gokel


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