Fig. 4. (a) Phosphorescence spectral traces of SiO2-1@mSiO2-2 (1 mg ml–1) in PBS buffer (pH = 7.4) at 298 K in the presence of 0–50 μM NaClO. (b) Plots of I 598 nm/I 500 nm as a function of ClO– concentration. (c) Selective ratiometric response of SiO2-1@mSiO2-2 (1 mg ml–1) toward ClO– (50 μM) over other ROS and RNS (200 μM) in PBS buffer at 298 K. (d) Photographs of SiO2-1@mSiO2-2 in PBS solution and complex 2 in MeOH under excitation at 365 nm.
