Synthesis of a novel methylene-bridged biscarbazole derivative and evaluation of its DNA and nucleotide binding properties

The synthesis of a novel methylene-bridged biscarbazole derivative 1 was described and the possible mechanism for its unexpectedly synthesized intermediate, compound A, was postulated. The binding properties of 1 to both Ct-DNA and nucleotides were investigated via fluorescent and UV–Vis spectra. The spectral investigations illustrated that this binary carbazole exhibited higher binding abilities to both Ct-DNA and nucleotides than its monomeric form, owing to the structurally flexible nature of double carbazole moieties fine-tuned by this non rigid methylene-linkage.