Substituent effects on complexation and extraction of alkali metals with chromogenic crown ethers

Lipophilic thiacrown ether derivatives as neutral silver-ion selective carriers

“…Synthesis of 3-Dodecyl-1,15,11 -trioxa-8,14-dithiacyclohexadecane or Dodecyl-dithia-16-crown-5 (2).-NaOH (0.2 g, 5 mmol) was added to ethanol (200 ml) and the mixture was refluxed. A solution of 5-dodecyl-3,7-dioxanonane-I ,9-diyI ditosylate (1 g, 1.56 mmol) and 2,2'-oxydiethanethiol (0.216 g, 1.56 mmol) in ethanol (50 ml) was added dropwise to the refluxing solution over 4 h; the mixture was then refluxed for a further 7 h. After this, the solvent was removed under reduced pressure, and the residue diluted with water (50 ml) and extracted with CHCl, (50 ml x 3).…”

Substituted Position Effect on Twisted intramolecular Charge Transfer of 1- and 2-anthracene aromatic Carboxamides as Chemosensors Based on Linear Polyether

“…13,14 For such ligands, selective metal-ion recognition by a crown ether framework is coupled with a color change upon proton dissociation of the chromophore group. Monoprotic chromoionophores with a picrylamine moiety in the sidearm have been studied by Takagi et al 9,[15][16][17][18] and Pacey et al [19][20][21][22] as colorimetric reagents for the selective recognition of alkali metal ions in solvent extraction systems.…”

Hydroxyphenoxyethyl Ether Dye: Synthesis, Complexation, and Alkali Metal Transport

“…[1] These compounds are used as phasetransfer catalysts in organic synthesis; however, their analytical applications are very limited. [5] Considerable attention has been focussed on crown ether dyes, and chromogenic crown ethers with a chromophore such as picryl amine, azo-types, and others. [5] Considerable attention has been focussed on crown ether dyes, and chromogenic crown ethers with a chromophore such as picryl amine, azo-types, and others.…”