Spectral Luminescence Properties and Stability of Zinc(II) Dipyrromethenates with Different Structures in Proton-Donor Media in the Ground and Excited Electronic States

The spectral luminescent properties of a series of zinc dipyrromethenate [Zn(dpm)2] with alkyl-, phenyl-, meso-aza-, and halogen substituents in the ligand are studied in solutions in ethanol (neutral and acidified with hydrochloric acid). The stability of the complexes in proton-donor solvents in the ground and excited states is investigated, and quantum yields of laser-induced phototransformations are measured. In a number of cases, a relationship between the photochemical stability of the investigated dipyrromethenates and their properties in proton-donor media is found and discussed.