Benzotriazole Functionalized N-Heterocyclic Carbene–Silver(I) Complexes: Synthesis, Cytotoxicity, Antimicrobial, DNA Binding, and Molecular Docking Studies

Abstract

In this study, six [Ag(NHC)<inf>2</inf>]+[AgCl<inf>2</inf>]− type silver complexes were synthesized by the reaction of corresponding carbene precursor and Ag<inf>2</inf>O. One [Ag(NHC)<inf>2</inf>]+NO<inf>3</inf>− type complex was synthesized by the anion exchange reaction of corresponding silver–NHC and NaNO<inf>3</inf>. The synthesized complexes were characterized by 1H NMR, 13C NMR and IR spectroscopic methods, and elemental analysis. X-ray crystal structure of 5a was also reported. Cytotoxicities of all compounds were evaluated against human breast (MCF-7) and colorectal (Caco-2) cancer cell lines and non-cancer mouse fibroblast (L-929) cell lines. All complexes performed stronger activity against both cancer cell lines than standard compound cisplatin while complex 3b performed nearly equal cytotoxicity to cisplatin against non-cancer L-929. Antimicrobial effects of all compounds were evaluated against Escherichia coli, Bacillus subtilis and Candida albicans and good activities were observed. The docking results indicated that complex 3b might be classified as druggable molecule in drug design. DNA binding study also demonstrates that 3b complex has an interaction ability to DNA. Combination of experimental and molecular docking results revealed that reported complexes are promising structures and deserve further research as anticancer drugs. © 2018 Elsevier Ltd