Journal
SENSORS
Volume 15, Issue 4, Pages 9097-9111Publisher
MDPI AG
DOI: 10.3390/s150409097
Keywords
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Funding
- Ministry of Human Resource Development (MHRD), New Delhi, India
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A series of rhodamine derivatives L1-L3 have been prepared and characterized by IR, H-1-NMR, C-13-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 L1-L3 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).
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