Abstract
Two novel fluorescent rhodamine derivatives L1 and L2 have been synthesized and characterized by various analytical techniques. The sensors exhibited an extremely selective and sensitive “turn-ON” fluorescent and colorimetric response toward Cr3+ in methanol. Upon the addition of Cr3+, the spirolactam ring of probes was opened and a 1:1 metal–ligand complex was formed. The stoichiometry between Cr3+ and probe was further clarified by mass spectra. The chemodosimeter (L1 and L2) exhibited a good binding constant and lowest detection limit towards Cr(III), and also successfully examined the reversibility of complexation of metal to ligand (opened ring to spirolactam ring).
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