Table 4.

Comparison of (Photo)toxicities of Complexes 3 and 5 Toward SK-MEL-28 Cancer Cells.

Complex	Dark	Vis lighta		Red lightc
	EC50 / μM	EC50 / μM	PIb	EC50 / μM	PId
3	67.0±0.91	0.27±0.01	248	58.9±0.69	1
5	> 300	0.69±0.01	> 435	136±5.73	> 2

^a16 hours drug-to-light interval followed by 100 J·cm⁻² broadband visible light irradiation,

^bPI = phototherapeutic index (ratio of dark EC₅₀ to visible-light EC₅₀),

^c16 hours drug-to-light interval followed by 100 J·cm⁻² light irradiation with 625-nm LEDs,

^dPI = phototherapeutic index (ratio of dark EC₅₀ to red-light EC₅₀).