Mesitylene based azo-coupled chromogenic tripodal receptors—a visual detection of Ag(I) in aqueous medium

DNA based gold nanoparticles colorimetric sensors for sensitive and selective detection of Ag(I) ions

“…Ag(I) ions are reported to be greatly toxic to a lot of bacteria, viruses, algae and fungi [20], and such antibacterial activity of Ag(I) ions has been employed into many application fields (such as toiletry, timbering, clinical material). However, once the concentration of Ag(I) ions is high enough, they can still bring harmful side-effects to the environments.…”

“…However, once the concentration of Ag(I) ions is high enough, they can still bring harmful side-effects to the environments. Additionally, Ag(I) ions are considered to be one of the heavy metal ions that can bring environmental pollutant for water resources [20]. Therefore, the recognition of Ag(I) ions should be an important part of chemical research.…”

“…Therefore, the recognition of Ag(I) ions should be an important part of chemical research. But until now the effective methods to test and standardize Ag(I) ions are still limited and relatively complex [20][21][22].…”

Spectroscopic and electrochemical studies of two distal diethyl ester azocalix[4]arene derivatives

“…By converting molecular recognition into optical or chemical signal, one can easily and analytically detect various kinds of chemical species. Azophenol derivatized chromophores were reported to give a color change upon specific metal ion complexation [6][7][8][9][10]. These color changes as signals for chemical species can be detected by ''naked eye" with inexpensive equipment or no equipment at all.…”

“…Most studies on azocalixarene derivatives involve the functionalization of the lower rim with metal-chelating groups, such as carboxylic acid, ester and crown groups [6,7,16,17]. The aims of these calix [4]arene functionalizations are to control their conformations, to increase their solubility and to enhance the selectivity and efficiency of their complexation properties [18].…”