Detecting Ni(II) in aqueous solution by 3-(2-pyridyl)-[1,2,3]triazolo[1,5-a]pyridine and dimethyl-β-cyclodextrin

Supramolecular Luminescent Sensors

“…Because the association complex was nontoxic to HeLa cells, in vivo Cu 2+ detection was also obtained. Moreover, Jullian et al reported that, in the absence of a supramolecular host, the emission of fluorophore 14 (Figure ) decreased only slightly in the presence of Cu 2+ . Yet, when dimethyl-β-cyclodextrin was present, the fluorescence of 14 was decreased by both Cu 2+ and Ni 2+ , and the system could thus be used for the detection of both cations, with extremely low detection limits for nickel (65 ppb) obtained.…”

“…Various novel fluorophores used in ternary (compounds 13 , 14 , and 15 ) and binary (compound 16 ) cyclodextrin detection schemes.…”

“…Moreover, Jullian et al reported that, in the absence of a supramolecular host, the emission of fluorophore 14 (Figure 36) decreased only slightly in the presence of Cu 2+ . 1100 Yet, when dimethyl-β-cyclodextrin was present, the fluorescence of 14 was decreased by both Cu 2+ and Ni 2+ , and the system could thus be used for the detection of both cations, with extremely low detection limits for nickel (65 ppb) obtained. Finally, Pd 2+ was detected by Stalin and coworkers using an inclusion complex of β-cyclodextrin and 15 (Figure 36), with a detection limit of 1.0 μM obtained.…”

Combining Amines and 3-(2-Pyridyl)-[1,2,3]Triazolo[1,5-a]pyridine: An Easy Access to New Functional Polynitrogenated Ligands

“…value reported for 1 (Figure 1). 16 The fluorescence of this compound was quenched in acid pH, contrarily to what is currently reported for triazolopyridines giving similar pK a values (see the Supporting Information). 7c As observed in Figure 1, going from basic pH (dashed black line) to acid pH (dashed red line), some of the bands change.…”

“…Initially, two possible sites of protonation are available: the terminal aliphatic amine (pK a 9-10) and the pyridine-triazolopyridine moiety (pK a 3.4-3.7). 16 Compound 3a exhibits UV/Vis spectra with bands at 200, 270 and 350 nm. In addition, an intense fluorescence emission at 410-500 nm was observed upon excitation at 350 nm (see the Supporting Information).…”