Abdulkadir KOÇAK, Hakan KANDEMİR, Süreyya Oğuz TÜMAY, Bünyemin ÇOŞUT, Yunus ZORLU, İbrahim Fazil ŞENGÜL

Experimental and theoretical studies of carbazole-based Schiff base as a fluorescent $Fe^{3+}$ probe

Synthesis of a new (E)-N1-((9-ethyl-9H-carbazol-3-yl)methylene)-5-nitrobenzene-1,2-diamine as a fluorescent chemosensor for selective detection of $Fe^{3+}$ion over a number of other metal ions is described. The method for the synthesis of the carbazole Schiff base was based on the condensation of carbazole-3-carbaldehyde with 4-nitro-ophenyldiamine in dimethylformamide in a moderate yield. The structure of the final compound was characterized by $^{1} H NMR, {13}$ C NMR, IR, mass spectrometry, and single crystal X-ray diffraction. The final compound exhibited exceptional selective and sensitive turn-on fluorescence response to the $Fe^{3+}$cation. The fluorescent intensity of the final compound was increased 20-fold and the stoichiometry ratio of the final compound to $Fe^{3+}$was 1:1. The association constant and detection limit for $Fe^{3+}$ion were predicted from fluorescence titrations as (1.36 ± 0.09).$10^{4} M ^{−1}$ and 1.0 to 6.0 µM, respectively. The photophysical behavior of the compound was further explored by DFT methods. The predicted UV-Vis spectrum by TDDFT calculations was compared to the observed absorption spectrum of the targeted compound.

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