Figure 3
UV-vis absorption (black curves) and FL emission spectra (recorded for progressively increasing excitation wavelengths in 20 nm increments) of 1S102H (a), 1S103H (b), 1S104H (c) and 1S101F (d) before (I) and after (II) the reduction by NaBH4
The concentration of all the four HS is 0.02 mg/mL. Insets are the photographs of the four HS solutions before and after the reduction of NaBH4 under a UV light of 365 nm.
