Abstract
We have designed and synthesized known coumarin-rhodamine (CR1) derivative for sensing the Al3+ ion in the presence of aprotic (CH3CN/H2O) medium via TBET mechanism. The results of the photo physical studies revealed that the sensing mechanism involves Al3+ induced change from non-fluoroscent (spirolactam form) to fluorescent (ring opening form) in CR1 leading to the visible color change. The Job's plot indicated the formation of 2:1 complex between CR1 and Al3+ with limit of detection is 1.78 × 10−8 M. Various spectroscopy techniques and theoretical calculation have been employed to investigate the mechanism of the sensing property of CR1 with Al3+.
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Acknowledgments
This study was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (Grant no. 2014006660).