Issue 42, 2013
From the journal:

Dalton Transactions

CHEF induced highly selective and sensitive turn-on fluorogenic and colorimetric sensor for Fe3+†

Shyamaprosad Goswami,*a   Sangita Das,a   Krishnendu Aich,a   Deblina Sarkar,b   Tapan Kumar Mondal,b   Ching Kheng Quahc  and  Hoong-Kun Funcd  

* Corresponding authors

a Department of Chemistry, Bengal Engg. and Science University, Shibpur, Howrah-711 103, India
E-mail: spgoswamical@yahoo.com
Fax: +91 33 2668 2916
Tel: +91 33 2668 2961-3

b Department of Chemistry, Jadavpur University, Kolkata-700032, India
E-mail: tkmondal@chemistry.jdvu.ac.in

c X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia

d Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
E-mail: hfun.c@ksu.edu.sa
Fax: (+966) 146-76220
Tel: (+966) 146-77335

Abstract

A new fluorescent probe was synthesized from rhodamine-6G and 6-(hydroxymethyl) picolinohydrazide for the sensing of Fe3+ in an aqueous environment. The structure of the sensor was confirmed through its single crystal X-ray study. It exhibits a high specificity and sensitivity towards Fe3+ over other interfering heavy and transition metal ions (HTM). The turn-on greenish-yellow fluorescence and a colorimetric change from colourless to pink were observed upon addition of Fe3+ which evokes almost 116- and 23-fold enhancement in absorbance and emission intensity respectively in an acetonitrile–water (1 : 1, v/v, 25 °C) solution at a neutral pH (pH = 7.2). The Fe3+ promoted ring opening of the spirolactam framework to the open chain amide platform of the sensor is responsible for its visible colour change and turn-on fluorescence activity. It also exhibits an excellent performance in the “dip stick” method. Moreover the limit of detection of the probe is in the 10−8 M range.

Graphical abstract: CHEF induced highly selective and sensitive turn-on fluorogenic and colorimetric sensor for Fe3+

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Article information

DOI
https://doi.org/10.1039/C3DT51974K
Article type
Paper
Submitted
20 Jul 2013
Accepted
12 Aug 2013
First published
13 Aug 2013

Dalton Trans., 2013,42, 15113-15119

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CHEF induced highly selective and sensitive turn-on fluorogenic and colorimetric sensor for Fe3+

S. Goswami, S. Das, K. Aich, D. Sarkar, T. K. Mondal, C. K. Quah and H. Fun, Dalton Trans., 2013, 42, 15113 DOI: 10.1039/C3DT51974K

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