By G.W. Gokel
A part of a sequence which offers studies of efforts in all components of supramolecular technological know-how, this quantity discusses a number of issues within the box.
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Extra info for Advances in Supramolecular Chemistry, Volume 4 (Advances in Supramolecular Chemistry)
The positive electrostatic charge of Ru(II) polypyridyl complexes has been combined with hydrogen-bond donating primary carboxamide groups in Beer's 68167 to yield anion-sensitive luminescent systems. Structural variations have allowed strong biasing of CI-/H2PO~ selectivity in either direction. ~~0~ 0~ 70 mediating guests. However there is no question about the success of anion-induced luminescent switching action in these cases. The final call on this whistle-stop tour concerns an extension of integrated lumophore-receptor systems, in both a conceptual and a literal sense, with polymeric lumophores.
As predicted, when the anthracene module of these cases is excited they showed strongly pH-dependent anthracene emission, whereas the aminonaphthalimide emission arising via electronic energy transfer (EET) was much less affected by pH. This means that the latter emission serves as an internal reference. Ratioing of these two emissions yields a smooth sigmoidal function versus pH which is immune to microenvironmental variations. Current sensors 12 achieve self-calibration by using one population of sensor molecules (say ionbound) as the internal reference for the other population of ion-free sensor molecules.
One of them will combine with the lumophore to produce guest-ion-induced off-on behavior, whereas the other receptor will give rise to on-off action at the lumophore. The integration of these two opposite switching functions within a single supermolecule produces "off-on-off" behavior (Figure 11). This means that luminescence is seen only over a narrow range of ion concentrations. Such sensors are sophisticated enough to directly indicate the occurrence of a concentration window with no signal processing.
Advances in Supramolecular Chemistry, Volume 4 (Advances in Supramolecular Chemistry) by G.W. Gokel