Abstract:
Rhodium(i) complexes bearing N-heterocyclic carbene (NHC) ligands have been widely used in catalytic chemistry, but there are very few reports of biological properties of these types of complexes. A series of benzimidazolium salts and their [RhCl(NHC)(COD)] complexes were synthesized. The obtained complexes were synthesized and characterized by elemental analysis, FT-IR,1H and13C NMR. All compounds were screened forin vitrocytotoxic activities against a panel of human cancer cells (HT-29 colon, Ishikawa endometrial, and U-87 glioblastoma) using the MTT assay for 48 h of incubation time. Mouse fibroblast cells (L-929) were used as healthy cells. Complexes had exhibited significantly higher cytotoxic activity towards cancer cells than their ligands and complex2bshowed the most selective cytotoxic activity against HT-29 cancer cells (SI;7.05) and Ishikawa cancer cells (SI; more than 9.8). The complexes showed strongin vitrocytotoxic activity against cancer cells, with IC50values of lower than 10 μM (except2aagainst HT-29 (12.8 μM) and2bagainst U-87 (11.1 μM)). All complexes (2a-d) showed the highestin vitrocytotoxic activity against Ishikawa endometrial cancer cells with IC50values of 2.93 ± 0.06, <1, 2.60 ± 0.05, and 2.85 ± 0.06 μM, respectively. Complexes were found to be highly cytotoxic against HT-29, Ishikawa, and U-87 cancer cells compared to the anticancer agents, cisplatin and 5-FU. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2021.