A uranyl ion-sensitive chromoionophore based on calix[6]arene

Abstract

A new type of chromoionophore, mono(indoani1ine)-derived calix[6]arene 1, has been synthesized, which shows a selective U022+ ion-induced pronounced colour change (wavelength change ca. 60 nm) with increasing absorption intensity in 99% EtOH at 25 "C, making it of potential use as an optical sensor for U022+ detection.

Opto-Chemical and Opto-Immuno Sensors

“…of TLC plates for VOCs measurements [165] [159] Uranyl ion-sensitive chromoionophore in calix [6]arene [257] Lithium ion-selective optical fiber sensor by novel neutral ionophore [435] Ion-selective electrodes and ion optodes (review with 254 refs. ) [443] Synth, and charact.…”

Calixarene-Based Molecules for Cation Recognition

“…The pentahydroxycalix [6]arene acts as a pseudoplanar pentadentate ligand, for UO 2 2+ and with the indoaniline group introduced responds selectively with a bathochromic shift (59 nm) in the presence of a base [200]. …”

Characterization of Chromogenic Calix[4]arene Derivative Based Ion-Selective Optical Sensors

“…5 -7 Since the remarkable success with calix [4]aryl tetraesters in potentiometric membranes for the selective detection of sodium ions 8 , calixarene derivatives of different chemical structures have been used as a recognition element in chemical sensors and as a reagent for the optical detection of analytes of different nature. 9 It has been found that e.g., calix [4]arene tetraesters with anthracene moieties 10 , or with azophenol group 11 show an optical response to alkali metal cations, while mono indoaniline derived chromogenic calix [6]arene to uranyl ion 12 , and pyrene-functionalized calix [3]arene to ammonium ions. 13 The availability of chromogenic calixarene molecules which in solution phase experiments exhibited a variation in their absorption or fluorescent spectra due to interactions with metal cations, initiated research work to utilize this type of chromogenic ligands in optical sensors, too.…”