Chromo- and Fluoroionophores Based on Diaza-Crown Ethers for Alkaline Earth Metal Ions

Highly silver ion selective fluorescence ionophore: Fluorescent properties of polythiazaalkane derivatives bearing 8-(7-hydroxy-4-methyl)coumarinyl moiety in aqueous solution and in liquid–liquid extraction systems

“…where AgL(HL) m-1 is a 1 : m complex of Ag + : extractant. When [Ag + ] [ [AgL(HL) m-1 ] in the aqueous phase, the logarithmic form of eqn ( 9) can be rewritten by the substitution of eqn (10) as follows:…”

“…The absorption and fluorescence spectra of such chromoionophores are much less subject to the influence of water in the surrounding solution. [8][9][10] We have studied cyclic and acyclic polythiazaalkane derivatives as ionophores for some metal ions. Cyclic and acyclic N-phenyltetrathiazaalkane derivatives especially exhibited Ag + selectivity in the liquid-liquid extraction of some heavy metal ions.…”

New Fluorescent Chemosensors for Heavy Metal Ions Based on Functionalized Pendant Arm Derivatives of 7-Anthracenylmethyl-1,4,10-trioxa-7,13-diazacyclopentadecane

“…1,4,10-trioxa-7,13-diazacyclopentadecane ( L 1 ) is commercially available, and because of its marked tendency to bind different metal ions (alkali and alkaline earths, transition metals and lanthanides) − it has already been used as a receptor unit in redox and fluorescent conjugated chemosensors. − Normally, fluorescent conjugated chemosensors based on polyaza or aza−oxa macrocyclic receptors such as L 1 feature, for obvious synthetic reasons, all of the nitrogen donor atoms belonging to the macrocyclic framework functionalized with the same type of signaling fluorogenic unit ( L 2 in Figure reported by Martínez-Máñez and co-workers, which features two anthracenylmethyl units attached to the secondary nitrogen atoms of L 1 ; the emission intensity of L 2 is selectively enhanced in the presence of Hg II at basic pH in 1,4-dioxane/H 2 O, 70:30 v/v). − Martínez-Máñez and co-workers have also reported difunctionalized polyaza or aza−oxa macrocyclic receptors that contain more than one type of signaling unit; these systems can be considered as multiple-sensing chemosensors capable of displaying two or more macroscopic observable events upon the addition of a certain analyte …”