A highly selective fluorescent chemosensor for fluoride based on an anthracene diamine derivative incorporating indole

Chromogenic and fluorogenic chemosensors and reagents for anions. A comprehensive review of the year 2009

“…43) contains an anthracene fluorophore attached through amide linkages to two indole units. 162 Dichloromethane-DMSO (9 : 1 v/v) solutions of 114 show an emission band centred at 429 nm. Addition of 5 equivalents of F À induced an emission intensity enhancement with a red shift of 7 nm whereas addition of AcO À , Cl À , Br À , I À , HSO 4 À , H 2 PO 4 À and NO 3 À induced negligible changes in the emission intensity.…”

Reversible “OFF–ON” fluorescent and colorimetric sensor based benzothiazole-bisphenol A for fluoride in MeCN

“…In contrast, there was no significant fluorescence change in the presence of other anions. This is due to the higher electronegativity, smaller size and higher basicity of F -23 ions, which makes them bind more strongly with BBA. That is why F -could be recognized addition of F -anion to BBA solution over other various anions(Fig.…”

“…The deprotonation of the phenolic-OH in BBA also induced two distinct22 effects on the aromatic substituents. The protons of benzene moiety significant upfield shifted23 due to the electron density on the phenyl rings with through bond propagation which24 generates a shielding effect, whereas the signal at 7.39 ppm gradually shifted downfield due…”

Linear Neutral Receptors for Anions: Synthesis, Structure and Applications

“…Receptor 35 with an additional hydrogen bond donor, i.e., an indole derivative, was also studied. 32 In the latter case, 1,8-diaminoanthracene was reacted with indole-2-carboxylic acid to afford receptor 35 (Scheme 8).…”