UV–vis absorption spectra of 1–6 in DMSO solution (5 × 10–5 M), normalized excitation and emission spectra of complexes 1–6, imidazolium salt, and A in DMSO solution at 298 K, flow cytometry diagram of complex 4 incubated with A549 cells at different concentrations, incubation of A549 with complex 4 in the presence and absence of Z-VAD-fmk, a caspase inhibitor, superposition of UV–vis absorption graphs of complex 1 (5 × 10–5 M DMSO/PBS, <0.5% DMSO) taken over a period of 24 h, and superposition of UV–vis absorption graphs of complex 4 (5 × 10–5 M DMSO/PBS, <0.5% DMSO) taken over a period of 24 h.

Peer reviewed