The cis‐Diammineplatinum(II) Complex of Curcumin: A Dual Action DNA Crosslinking and Photochemotherapeutic Agent

[Pt(cur)(NH₃)₂](NO₃) ( 1 ), a curcumin‐bound cis‐diammineplatinum(II) complex, nicknamed Platicur, as a novel photoactivated chemotherapeutic agent releases photoactive curcumin and an active platinum(II) species upon irradiation with visible light. The hydrolytic instability of free curcumin reduces upon binding to platinum(II). Interactions of 1 with 5′‐GMP and ct‐DNA indicated formation of platinum‐bound DNA adducts upon exposure to visible light (λ=400–700 nm). It showed apoptotic photocytotoxicity in cancer cells (IC₅₀≈15 μM ), thus forming ^?OH, while remaining passive in the darkness (IC₅₀>200 μM ). A comet assay and platinum estimation suggest Pt–DNA crosslink formation. The fluorescence microscopic images showed cytosolic localization of curcumin, thus implying possibility of dual action as a chemo‐ and phototherapeutic agent.