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Sensors 2015, 15(4), 9097-9111; doi:10.3390/s150409097

Highly Sensitive and Selective Colorimetric and Off-On Fluorescent Reversible Chemosensors for Al3+ Based on the Rhodamine Fluorophore

Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India
Center for Environment and Water, The research Institute, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
Department of Applied Chemistry, University of Johannesburg, Johannesburg 17011, South Africa
Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 16 February 2015 / Revised: 13 April 2015 / Accepted: 14 April 2015 / Published: 17 April 2015
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [2048 KB, uploaded 20 April 2015]   |  


A series of rhodamine derivatives L1L3 have been prepared and characterized by IR, 1H-NMR, 13C-NMR and ESI-MS. These compounds exhibited selective and sensitive “turn-on” fluorescent and colorimetric responses to Al3+ in methanol. Upon the addition of Al(III), the spiro ring was opened and a metal-probe complex was formed in a 1:1 stoichiometry, as was further confirmed by ESI-MS spectroscopy. The chemo-dosimeters L1L3 exhibited good binding constants and low detection limits towards Al(III). We also successfully demonstrate the reversibility of the metal to ligand complexation (opened ring to spirolactam ring). View Full-Text
Keywords: chemosensor; rhodamine; colorimetric; fluorescence; naked-eye detection chemosensor; rhodamine; colorimetric; fluorescence; naked-eye detection

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mergu, N.; Singh, A.K.; Gupta, V.K. Highly Sensitive and Selective Colorimetric and Off-On Fluorescent Reversible Chemosensors for Al3+ Based on the Rhodamine Fluorophore. Sensors 2015, 15, 9097-9111.

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