A BTT-Based Colorimetric Dual Sensor for Hg(II) and Selected Anions with Molecular Logic Operations

Figure 4

Changes in UV-vis absorption spectra of 2 (1 × 10⁻⁵ M) upon the addition of (a) 0.3 equiv. Hg²⁺ and (b) 4 equiv. Zn²⁺, all in DMSO at 25°C.

(a)

(b)