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Figure S1. Perspective view of the cation in [Pt(Thpy)PPh3(CH3CN)]ClO4 (2) (30% probability ellipsoids).

Figure S2. Perspective view of the cation in [Pt(Thpy)PPh3(py)]ClO4 (3) (30% probability ellipsoids).

Figure S3. Perspective view of the cation in [Pt(Thpy)(HThpy)py]ClO4 (5) (30% probability ellipsoids).

Figure S4. A plot of 1O2 emission intensity against absorption with excitation wavelength of 355 nm using sensitizers (1, 4, and 7) in CD2Cl2 compared to that of C60 as a reference.

Figure S5. Emission spectral traces of 5ex = 400 nm, concentration = 1 × 10−5 M) at different equivalents of calf thymus DNA (from 0 with addition of 3 equivalents per interval up to 18 equivalents) in Tris buffer solution at 298 K.

Figure S6. Emission spectral traces of 5ex = 400 nm, concentration = 1 × 10−5 M) at different equivalents of BSA (from 0 with addition of 0.1 equivalent per interval up to 0.6 equivalent) in PBS solution at 298 K.

Figure S7. Plot of percent viability of HeLa cancer cells as a function of concentration of 3 in the dark (black line) and upon irradiated with visible light (red line).

Figure S8. (a) Fluorescence microscopic and (b) brightfield images of HeLa cells incubated with 5 (5 μM) at 37 °C for 1 h. (c) Overlay of luminescence images of (a) and (b).

Table S1. Photophysical data

Table S2. Crystal Data

Table S3. Selected Bond Lengths (Å) and Angles (deg).

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