Abstract
A new rhodamine-based Schiff base (L) has been synthesized and characterized by physicochemical and spectroscopic tools. This organic molecule selectively reacts with \(\hbox {Cu}^{2+}\) ions with a remarkably significant optical change, which supports the development of a chemosensor for \(\hbox {Cu}^{2+}\) ions as low as nanomolar level in aqueous medium. On the basis of the experimental work, the ‘turn-on’ colorimetric/fluorimetric spectroscopic change is due to \(\hbox {Cu}^{2+}\) ion-assisted hydrolysis followed by spirolactam ring opening of the probe (L) in 20 mM HEPES buffer [pH 7.4; water/acetonitrile (9:1 v/v)]. The competitive ions do not affect the selectivity and specificity of the probe (L) in the detection of \(\hbox {Cu}^{2+}\) ions. The cell imaging study using fluorescence microscope showed that this non-cytotoxic probe is useful to detect the distribution of \(\hbox {Cu}^{2+}\) ions in AGS cells lines.
Graphical abstract
A new turn-on non-cytotoxic rhodamine hydrazone derivative (L) senses \(\hbox {Cu}^{2+}\) ion in nano molar region selectively in 20 mM HEPES buffer [pH 7.4; water/acetonitrile (9:1 v/v)] and is an efficient biomarker to detect \(\hbox {Cu}^{2+}\) ions in living cells.
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Acknowledgements
The financial assistance from Department of Science and Technology, Govt. of West Bengal (DST, GoWB, vide Project No. 698 (Sanc.)/ST/P/S & T/15-G/2015) is gratefully acknowledged. S. Lohar is thankful to UGC, New Delhi, India for a fellowship. The authors are indebted to Dr. Abhishek Mukherjee, Indian Institute of Chemical Biology, Kolkata for cell imaging and cell viability study.
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Maji, A., Lohar, S., Pal, S. et al. A new rhodamine based ‘turn-on’ \(\hbox {Cu}^{2+}\) ion selective chemosensor in aqueous system applicable in bioimaging. J Chem Sci 129, 1423–1430 (2017). https://doi.org/10.1007/s12039-017-1349-4
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DOI: https://doi.org/10.1007/s12039-017-1349-4