Ultrasensitive Optical Chemosensor for Cu(II) Detection

Figure 3

(a) Absorption spectral alterations of chemosensor BDC upon gradual addition of (0–2 equiv.) Cu(II); (b) the linear relationship of the absorbance ratio at 351 and 241 nm (A₂₄₁/A₃₅₁) versus [Cu(II)].

(a)

(b)