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Issue 12, 2015
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A novel rhodamine-3,4-dihydro-2H-1,3-benzoxazine conjugate as a highly sensitive and selective chemosensor for Fe3+ ions with cytoplasmic cell imaging possibilities

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Abstract

A novel, highly sensitive and selective fluorescent chemosensor ‘rhodamine-3,4-dihydro-2H-1,3-benzoxazine’ [RH-BZN (1)] has been synthesized and characterized by single crystal X-ray diffraction and other physicochemical techniques. In 3 : 7 water : MeCN (v/v) at pH 7.2 (10 mM HEPES buffer, μ = 0.05 M LiCl) it selectively recognizes Fe3+ through 1 : 1 complex formation resulting in a 240-fold fluorescence enhancement and a binding constant (Kf) of 1.50 × 104 M−1. The otherwise non-fluorescent spirolactam form of the probe results in dual changes in absorbance and fluorescence arising out of opening of the spirolactam ring through coordination to Fe3+ ions. This probe could suitably be employed for cytoplasmic intracellular imaging of Fe3+ without notable cytotoxicity. The reversible binding of RH-BZN to Fe3+ was confirmed by reacting with tetra-n-butylammonium fluoride both in extra- and intra-cellular conditions.

Graphical abstract: A novel rhodamine-3,4-dihydro-2H-1,3-benzoxazine conjugate as a highly sensitive and selective chemosensor for Fe3+ ions with cytoplasmic cell imaging possibilities

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Publication details

The article was received on 21 Mar 2015, accepted on 08 May 2015 and first published on 11 May 2015


Article type: Paper
DOI: 10.1039/C5AY00754B
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Anal. Methods, 2015,7, 5149-5156

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    A novel rhodamine-3,4-dihydro-2H-1,3-benzoxazine conjugate as a highly sensitive and selective chemosensor for Fe3+ ions with cytoplasmic cell imaging possibilities

    H. A. Molla, R. Bhowmick, A. Katarkar, K. Chaudhuri, S. Gangopadhyay and M. Ali, Anal. Methods, 2015, 7, 5149
    DOI: 10.1039/C5AY00754B

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