Shaya AL RAQA, İpek ÖMEROĞLU, Doğan ERBAHAR, Mahmut DURMUŞ

A novel selective fluorescent chemosensor for $Fe^{3+}$ ions based on phthalonitrile dimer: synthesis, analysis, and theoretical studies

Phenyl-4,4-di(3,6-dibutoxyphthalonitrile) (3) was synthesized by the reaction of 1,4-phenylenebisboronic acid (1) and 4-bromo-3,6-dibutoxyphthalonitrile (2), using Suzuki cross-coupling reaction. The newly synthesized compound (3) was characterized by FT-IR, MALDI-MS, ESI-MS, $^1 H-NMR, ^{13}C-NMR$, and ^{13}C-DEPT-135-NMR. The fluorescence property of phenyl-4,4-di(3,6- dibutoxyphthalonitrile) (3) towards various metal ions was investigated by fluorescence spectroscopy, and it was observed thatthe compound (3) displayed a significantly ‘turn-off ’ response to Fe3+, which was referred to 1:2 complex formation between ligand (3) and $Fe^{3+}$. The compound was also studied via density functional theory calculations revealing the interaction mechanism of the molecule with $Fe^{3+}$ ions.

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