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

By G.W. Gokel

A part of a chain which provides reviews of efforts in all components of supramolecular technology, this quantity discusses various themes within the box.

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PRASANNA DE SILVA ETAL. Figure 2. (a) Schematic representation of the three-module format of an ionically switchable photoactive dyad (reverse logic). For a given lumophore, the receptors required here are more electron deficient than those used in Figure 1. We have tried to symbolize this with grey shading in the present case. In contrast to Figure 1, the direction of the electron transfer is such that the process is encouraged only when the cationic guest is bound to the receptor. Now luminescence loses the competition when cationic guests are present on/in the receptor.

I "-.......... luminescence'oIT' Figure 3. (a) Schematic representation of the three-module format of an ionically switchable photoactive dyad where the guest ion is redox active. In contrast to Figures I and 2, the charge sign of the guest ion is only of secondary importance. Note that the receptor is not directly involved in the electron transfer, again in contrast to Figures I and 2. e. either direction can be encouraged depending on the guest. Luminescence has no competition until the redox active guest is bound by the receptor, (b) Frontier molecular orbital energy diagrams corresponding to part (a).

B) An example illustrating the principles of part (a) from the aminomethyl aromatic family. The luminescence is switched "off" unless the receptor is in a region of high enough proton density. Organic polymers are attractive as matrices for the attachment of switchable luminescent devices at least partly because of their synthetic versatility. At the same time, inorganic polymers possess the attraction of robustness. This is one of the driving forces for the development of silica-attached luminescent switches.

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