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The optical and biological properties of 2‐(4‐dimethylaminophenyl)benzothiazole cycloplatinated complexes featuring bioactive ligands ([{Pt(Me 2 N‐pbt)(C 6 F 5 )}L] [L=Me 2 N‐pbtH  1 ,  p ‐dpbH (4‐(diphenylphosphino)benzoic acid)  2 ,  o ‐dpbH (2‐(diphenylphosphino)benzoic acid)  3 ), [Pt(Me 2 N‐pbt)( o ‐dpb)]  4 , [{Pt(Me 2 N‐pbt)(C 6 F 5 )} 2 (μ‐PR  n  P)] [PR 4 P=O(CH 2 CH 2 OC(O)C 6 H 4 PPh 2 ) 2   5 , PR 12 P=O{(CH 2 CH 2 O) 3 C(O)C 6 H 4 PPh 2 } 2   6 ] are presented. Complexes  1 – 6  display  1 ILCT and metal‐perturbed  3 ILCT dual emissions. The ratio between both bands is excitation dependent, accomplishing warm‐white emissions for  2 ,  5  and  6 . The phosphorescent emission is lost in aerated solutions owing to photoinduced electron transfer to  3 O 2  and the formation of  1 O 2 , as confirmed in complexes  2  and  4 . They also exhibit photoinduced phosphorescence enhancement in non‐degassed DMSO due to local oxidation of DMSO by sensitized  1 O 2 , which causes a local degassing. Me 2 N‐pbtH and the complexes specifically accumulate in the Golgi apparatus, although only  2 ,  3  and  6  were active against A549 and HeLa cancer cell lines,  6  being highly selective in respect to nontumoral cells. The potential photodynamic property of these complexes was demonstrated with complex  4 .

Investigation on Optical and Biological Properties of 2‐(4‐Dimethylaminophenyl)benzothiazole Based Cycloplatinated Complexes