3 Synthetic details of 7 and 8. 4 Job's Plot of 4 with Fe 3+ ions. 5 Fluorescence spectra of 7 in response to the presence of Fe 3+ ions. 6 Reversibility of Fe 3+ coordination to 4 by TBACl. 7 Job's Plot of 5 with Hg 2+ ions. 8 Fluorescence spectra of 8 in response to the presence of Hg 2+ ions. 9 Reversibility of Hg 2+ coordination to 5 by TBAI. 10 Fluorescent response of sensor 4 to Fe 3+ over other selected metal ions. 11 Fluorescent response of sensor 5 to Hg 2+ over other selected metal

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... s. 12 Fluorescence spectra of 4 (1 X 10 -5 M) in response to the presence of K + ions. 13 Fluorescence spectra of 5 (1 X 10 -5 M) in response to the presence of K + ions. 14 Fluorescence emission spectra of 4 on addition of K + ions and further addition of Fe 3+ ions . 15 Fluorescence emission spectra of 5 on addition of K + ions and further addition of Hg 2+ ions. 16 UV-vis spectra of 4 in response to the presence of Fe 3+ ions.