Lanthanide Recognition: Development of an Asymetric Gadolinium Microsensor Based on N-(2-pyridyl)-N′-(4-nitrophenyl)thiourea

Abstract

The first asymmetric potentiometric Gd(III) microsensor is reported here. N-(2-Pyridyl)-N 0 -(4-nitrophenyl)thiourea (PyTu 4 NO 2 ) was found to have a very selective and sensitive behavior toward Gd(III) ions, in comparison to other lanthanide ions as well as inner transition and representative metal ions and hence was used as a sensing material in the construction of a Gd(III) microelectrode. The Gd(III) sensor exhibits a Nernstian slope of 17.46 AE 0.3 mV per decade over the concentration range of 1.0 Â 10 À8 to 1.0 Â 10 À3 M and a detection limit of 3.0 Â 10 À9 M of Gd(III) ions. The potentiometric response of the sensor is independent of the solution pH in the range of 4.0-9.0. It manifests advantages of low detection limit and fast response time (10-15 s).

Development of a highly efficient gadolinium(III) potentiometric sensor using two aza-crown ether-based multiple diglycolamides (DGAs)

“…There are limited reports available on Gd 3+ potentiometric sensors in the literature. Among the reported results [6,17,[61][62][63][64][65], the present sensor membrane (M5, S.No.8) is found to be better suited to analyse Gd 3+ ion at lower concentrations than all the other reported membrane sensors except for that at S.No. 2 given in Table 4.…”

A lutetium pvc membrane sensor based on (2-oxo-1,2-diphenylethylidene)-n-phenylhydrazinecarbothioamide

“…Since there are some reports on lutetium sensors based on different ionophores [3][4][5][6] and also recent experience on the development of highly selective and sensitive PVC-membrane ISEs, [7][8][9][10][11][12][13][14][15][16][17][18][19][20] it was decided to assess the possibility of constructing a novel Lu 3+ sensor by testing (2-oxo-1,2-diphenylethylidene)-N--phenylhydrazinecarbothioamide (PHCT) (Fig. 1) as a neutral ion carrier.…”