The upper panel shows microscopic photographs of the MCF-7 cancer cells in the absence (C) and presence of different concentrations of the Ni(II) complex (indicated by the number inside each photo).

The upper panel shows microscopic photographs of the MCF-7 cancer cells in the absence (C) and presence of different concentrations of the Ni(II) complex (indicated by the number inside each photo). The lower graph shows the cytotoxic effect of the dppt ligand and the Ni(II) complex against the MCF-7 cancer cells in a concentration-dependent manner.