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

Figure 4

UV-Vis spectra taken upon pH-spectrophotometric titration of L1 (0.5 mM), in the presence of 2 eqv. Cu(CF₃SO₃)₂ (in H₂O : MeOH 3 : 2, 0.07 M NaNO₃, at 25°C). Long dash line: initial spectrum at pH 2.4; short dash line: spectrum at pH 6.4, corresponding to the maximum of the [Cu₂L1]⁴⁺ species; solid line: pH 11, spectrum corresponding to the hydroxide complex [Cu₂L1(OH)]³⁺.