Fluorescence sensing of Al3+ by an anthracene appended piperidone. Hindrance in excimer formation offered by β-cyclodextrin complexation

Synthesis of Ferrocene−Cyclodextrin, Anthracene−Cyclodextrin, and Pyrene−Cyclodextrin [2]Rotaxane Conjugates and Their Intercomponent Behavior as Observed in NMR Spectroscopy

“…Excitation of 2.3 × 10 À 4 M CH 2 Cl 2 solutions of salt 2, thread 5, and rotaxane 8 (all anthracene-containing) at around 370 nm yielded similar fluorescence peak signatures with λ max � 420 nm whereas excitation of salt 3 and compounds 6 and 9 (all pyrene moieties) at 345 nm gave similar spectrum profile with a maximum fluorescence signal at around 380 nm. This is in contrast with literature reports [24,25,44] detailing shifts in fluorescence peaks upon complexation of either anthracene or pyrene substituents with cyclodextrin groups. From these observations, we can infer that the presence of nearby aβCD species does not significantly alter the photophysical properties of either anthracene or pyrene units.…”

“…Anthracene-appended cyclodextrin structures were studied as potential novel sensors for detection of βCD-included organic compounds [23] and metal complexes. [24] Observed changes in the fluorescence behavior of anthracene species in these structures can signal the presence/release of these competitive guest molecules. PyÀ CD complexes have also been investigated where pyrene was shown to form a 1 : 1 complex with βCD under appropriate conditions.…”

“…To a lesser extent, anthracene−CD (An−CD) and pyrene−CD (Py−CD) interactions have also been investigated. Anthracene‐appended cyclodextrin structures were studied as potential novel sensors for detection of βCD‐included organic compounds [23] and metal complexes [24] . Observed changes in the fluorescence behavior of anthracene species in these structures can signal the presence/release of these competitive guest molecules.…”