Issue 30, 2013

A highly sensitive and selective fluorescent sensor for Al3+ ions based on thiophene-2-carboxylic acid hydrazide Schiff base

Abstract

An efficient fluorescent receptor (E)-N-[(2-hydroxy-naphthalen-1-yl)methylene]thiophene-2-carbohydrazide (THN) for Al3+ ions was synthesized and characterized by physicochemical and spectroscopic tools along with single crystal X-ray crystallography. This is the first report showing the crystal structure of THN and its sensing property for Al3+ ions. THN selectively and sensitively detects Al3+ ions without any interference among various cations, Na+, K+, Ca2+, Cr3+, Mg2+, Mn2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+ and Hg2+ by a strong fluorescent change in ethanolwater medium (EtOHH2O, 1 : 4 v/v). The THN interacts with Al3+ in a tridentate mode to form a [AlCl2(THN)(H2O)]·H2O complex. The binding constant was determined to be 7.06 × 106 M−1 and the limit of detection (LOD) was calculated to be 1.35 × 10−9 M which is the second highest reported till date in the literature. The 1H NMR titration, ESI-MS and DFT studies have also been performed in support of the binding details of the THN–Al3+ complex.

Graphical abstract: A highly sensitive and selective fluorescent sensor for Al3+ ions based on thiophene-2-carboxylic acid hydrazide Schiff base

Supplementary files

Additions and corrections

Article information

Article type
Paper
Submitted
02 Apr 2013
Accepted
25 Apr 2013
First published
30 Apr 2013

RSC Adv., 2013,3, 12124-12132

A highly sensitive and selective fluorescent sensor for Al3+ ions based on thiophene-2-carboxylic acid hydrazide Schiff base

K. Tiwari, M. Mishra and V. P. Singh, RSC Adv., 2013, 3, 12124 DOI: 10.1039/C3RA41573B

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