Absorption Spectra of Formylchlorins
The absorption spectra of the formylchlorins (in toluene at room temperature) are summarized in Table 2. Three classes are noted: zinc chlorins bearing a 10-mesityl group (ZnC-M10 series); zinc chlorins bearing a 5-p-tolyl group and a 10-mesityl group (ZnC-T5M10 series); and various free base chlorins (FbC series). Selected absorption spectra of the ZnC-M10 series are shown in Figure 1 (see Supporting Information for additional spectra).
The long-wavelength absorption band can now be tuned over the range of 606 – 667 nm.