Abstract
Abstract A new Schiff-base sensor containing fluorene was synthesized and investigated for determination of metal ions in dimethylsulfoxide solutions. Fluorescence was quenched upon coordination, showing selectivity for Cu(II) over Mn(II), Fe(III), Ni(II), Pd(II), Zn(II), Ca(II), Hg(II), Na(I) and K(I) in a concentration range of 1.00 to 10.0 × 10 ‐7 mol L ‐1 . Good results were observed for sensor 1 derived from 2‐formylpiridine. Benesi‐Hilderbrand formalism indicates that the most abundant species formed have 2:1 (metal/ligand) ratio with a calculated biding constant of 1.74 × 10 12 L 2 mol −2 in good agreement with the Stern‐Volmer constant K SV at 2.26 × 10 12 L 2 mol −2 . The limit of detection ( LOD ) for Cu(II) was found to be 0.037 μmol L −1 with a relative standard deviation ( RSD ) of 3.19% in the copper(II) concentration range of 3.00 to 7.00 × 10 −7 mol L ‐1 .
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