Pyrrole Based Schiff Base as a Highly Sensitive Fluorescent Sensor for Fe3+ and Sn2+ Ions

Condensation product of o-aminophenol and pyrrole-2-carboxylaldehyde behaves as a fluorescent sensor for Fe3+ and Sn2+ ions in aqueous medium over the other metal ions like Na+, K+, Mg2+, Zn2+, Cd2+, Hg2+, Mn2+ and Cr3+. In aqueous solution, Fe3+ and Sn2+ ions coordinate to the receptor through a NON binding site which induces a strong fluorescence enhancement. Receptor can be applied as fluorescence enhanced probes for transition metal ions due to the inhibition of photo induced electron transfer (PET) mechanism

Naphthalene thiourea derivative based colorimetric and fluorescent dual chemosensor for F⁻ and Cu²⁺/Hg²⁺ ions

<div><p>A structurally simple (<i>Z</i>)-2-(naphthalen-2-ylmethylene)-<i>N</i>-phenylhydrazinecarbothioamide (R<b>1</b>) was used as a colorimetric and fluorescent sensor for both F⁻ and Cu²⁺/Hg²⁺ ions. R<b>1</b> selectively recognised F⁻ ions as indicated by colour change from colourless to green. Fluorescence spectral data reveal that R<b>1</b> is an excellent fluorescence chemosensor for Cu²⁺ ions. Finally, R<b>1</b> was successfully applied to the bioimaging of Cu²⁺ ions in RAW 264.7 macrophage cells.</p></div