Synthesis and Study in Solution of a New Dansyl-Modified Azacryptand

Figure 2

Distribution diagram of the species (% abundance versus pH) obtained upon potentiometric titration of L1 in H₂O : MeOH 3 : 2 mixture (0.5 mM, 0.07 M NaNO₃, at 25°C). The corresponding protonation constants are shown in Table 1. Triangles: profiles of Mol Abs (×10⁻³, M⁻¹ cm⁻¹) at 288 nm (black) and 340 nm (white), respectively, obtained upon pH-spectrophotometric titration (right vertical axes, see Figure 1).