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By G.W. Gokel

A part of a chain which provides stories of efforts in all parts of supramolecular technological know-how, this quantity discusses quite a few issues within the box.

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Schematic representation of four common types of ion input-photon output in terms of the symbols commonly encountered in electronics. Their corresponding truth tables are also given in terms of chemically/physically measurable quantities. Supramolecular Photoionic Devices 41 ion lodges in the receptor, thereby quenching the fluorescence. Thus 17, discussed in Figure 2, shows strong fluorescence when H § is at a low level. When the H § input is high, the fluorescence output collapses. OR photoionic devices take advantage of poor chemoselectivity of an ion receptor.

EL CH:--~ CH2~ I OR I x-I a; R-Li n ~ ~ o-I" o /--k /--0 ~ 77 S i ~ N H 78 employed as a suspension which can be filtered off and reused. Furthermore, the potential exists for integration into fiber-optic systems. A precedent has been set by the attachment of a single-controlled pore glass (CPG) bead to a single fiber where the pH-sensitive lumophore fluorescein was covalently bound to the aminopropyl groups on the CPG surface. ~77 So it seems reasonable to conclude that the cases discussed here have only scratched the surface of what is possible with targeted and anchored lumophore-spacer-receptor systems.

It is noted that the luminescence of tris(2,2'-bipyridyl) Ru(II) itself is electroswitchable. Indeed tris(2,2'-bipyridyl) Ru(II)came to fame as a solar energy material ~51 from more humble beginnings as a luminescent redox indicator. ~52 However 55 achieves the same switching at a lower magnitude of reduction potential. Here lies the advantage of the supramolecular design. Like tris(2,2'bipyridyl) Ru(II), many lumophores show electroswitchable luminescence. An 24 A. PRASANNA DE SILVA ETAL. u(ll) 56 55 all-organic example would be anthracene whose bright blue emission would be lost upon generation of the radical anion in aprotic medium.

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