Figure 7.
(a) Plot of the change in the absorption spectrum, between 550 and 750 nm, as 0.6, 1.2, 1.7, 2.3, 2.8, and 3.8 equiv of CuCl was added to Co(II)-TTP-2D. (b) Plot of the change in the absorption spectrum, between 550 and 750 nm, as 0.6, 1.2, 1.7, 2.3, 2.8, and 3.8 equiv of ZnCl2 was added to Co(II)-TTP-2D. (c) Plot of the absorption spectrum at 650 nm as a function of either added Cu(I) or Zn(II). Titrations were performed with 16.5 μM Apo-TTP-2D in 200 mM HEPES, 100 mM NaCl, at pH 7.5.