Pyrrole bearing diazocrowns: Selective chromoionophores for lead(II) optical sensing

Optical sensors (optodes) for multiparameter chemical imaging: classification, challenges, and prospects

“…Recently, diazobenzocrowns with pyrrole residue as a part of the macrocycle were utilized as a dual Pb 2+ /pH indicator. 58 The authors suggested using absorption followed by digital color analysis. Both pH and lead( ii ) concentration influence optical signal: increasing lead( ii ) concentration leads to the color change from pink to blue-gray.…”

A Selective Fluorescent Optode for Lead(II) Based on the Dansylamidopropyl Pendant Arm Derivative of 1,4-Dioxa-7,13-dithia-10-azacyclopentadecane ([15]aneNS2O2)

“…In addition, fluorescence spectroscopy offers the possibility of local observation in cells and tissues using microscopy techniques. During the past 15-20 years, many research groups have been engaged in research programs devoted to the use of medium-sized macrocyclic ligands featuring different donor atoms, ring size cavity and molecular structure, for the development of optically selective fluorescent chemosensors for either essential to human life metals, i.e., Mg(II), Zn(II) or toxic heavy metals (Cd(II), Pb(II), Hg(II)), following synthetic paradigms based on the principles of supramolecular chemistry [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. In general, fluorescent chemosensors for metal ions consist of a receptor unit (for example a macrocyclic ligand) covalently linked through a spacer to a fluorogenic unit (conjugated fluorescent chemosensors) so that the selective host-guest interaction in solution of the target species at the receptor site is converted into a selective enhancement or quenching of the fluorophore emission signal, which can be easily detected.…”