Studies on DNA binding properties of new Schiff base ligands using spectroscopic, electrochemical and computational methods: Influence of substitutions on DNA-binding
Résumé
In this work, five new Schiff base ligands were synthesized and characterized by 1 H NMR, 13 C NMR, FT-IR, UV-Vis and elemental analysis (CHN). L 1 , L 2 and L 3 , were derived from condensation of 2-Hydroxy-5-bromobenzaldehyde with 4-aminobenzoic acid, 3aminobenzoic acid and 3-amino-4-methylbenzoic acid with 1:1 M ratio, respectively. While, L 4 and L 5 were prepared from condensation of 4-aminobenzoate with 3-ethoxy-2hydroxybenzaldehyde and 3-methoxy-2-hydroxybenzaldehyd with 1:1 M ratio, respectively. Furthermore, the crystal structure of L 4 and L 5 were determined by single crystal X-ray analysis. The interaction of Schiff base ligands with fish sperm DNA (FS-DNA) was investigated under physiological conditions using fluorescence quenching, UV-Vis spectroscopy, molecular docking and molecular dynamics (MD) simulation methods. The estimated binding constants (kb) for the DNA-Ligands complexes were 8.
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