calixarenes and quinoline

A quinoline functionalized pillar[5]arene, QPA has been prepared and its interaction with biologically relevant ions and molecules in aqueous solution has been demonstrated. The sensor molecule, QPA has shown selectivity towards Fe

Topics: Amino Acids, Basic; Calixarenes; Fluorides; Iron; Limit of Detection; Quinolines; Spectrometry, Fluorescence; Water

A new fluorescence receptor calix[4]pyrrole-N-(quinoline-8-yl) acetamide (CAMQ) containing a pyrrolic ring connected via the meso-position was synthesized, purified and characterized by elemental analysis, NMR and mass spectroscopy. This compound was examined for its fluorescence properties towards different metal ions e.g. Ag(I), Hg(II), Co(II), Ca(II), Ni(II), Zn(II), Cr(II), Ba(II), Fe(II), Cu(II), Pb(II)and Mg(II) ions by spectrophotometry and spectrofluorometry. It was concluded that the compound (CAMQ) possessed significantly enhanced selectivity for Pb(II) and Cu(II) ions in dimethyl sulfoxide (DMSO) even at very low concentrations (1 μM). It exhibit 'turn-on' fluorescence when exposed to Pb(II) and Cu(II) and did so in preference to other metal ions. The binding constants, stoichiometry and quantum yields have been determined. The quenching mechanism was assessed using the Stern-Volmer equation and was also discussed.

Topics: Amines; Calixarenes; Copper; Fluorescent Dyes; Ions; Lead; Molecular Structure; Porphyrins; Quantum Theory; Quinolines

The synthesis and characterization of a triazole linked quinoline appended calix[4]arene conjugate, L, and its fluorescence turn on receptor property for Fe(3+) have been demonstrated. The selective and sensitive discrimination of Fe(3+) has been shown using fluorescence and absorption titration experiments. The Fe(3+) binding to L has been further shown by ITC and ESI MS. The mode of binding of Fe(3+) by calix[4]arene conjugate has been shown by absorption, (1)H NMR and visual color change and the species were modeled based on DFT computations. The {L + Fe(3+)} has been shown to label cells with fluorescence imaging. Moreover the utility of this conjugate has been demonstrated by the combination logic gate system.

Topics: Calixarenes; Cell Line; Fluorescence; Fluorescent Dyes; Humans; Iron; Microscopy, Fluorescence; Models, Molecular; Phenols; Quantum Theory; Quinolines; Spectrometry, Mass, Electrospray Ionization

A novel PET with ICT based substituted calix[4]arene fluroionophore was synthesized and used for detection of Cu(2+) and F(-) by emission spectra. The detection limit of the synthesized receptor was found to be 4.16 nM for Cu(2+) and 2.15 nM for F(-). Moreover, this probe has been applied for recognition of Cu(2+) in blood serum and F(-) from waste water.

Topics: Anions; Calixarenes; Cations, Divalent; Copper; Fluorescent Dyes; Fluorine; Humans; Industrial Waste; Phenols; Quinolines; Spectrometry, Fluorescence; Wastewater; Water Pollutants, Chemical