Enhanced Visible Light Absorption and Photophysical Features of Novel Isomeric Magnesium Phthalocyaninates with Cyanophenoxy Substitution

Novel metal-free and Mg(II) [3/4-(3,4-dicyanophenoxy)phenoxy]-substituted phthalocyanines were obtained characterized using NMR, IR, UV-vis spectroscopy, mass spectrometry. This substitution provided compounds with good solubility in organic media, thus their spectroscopic fluorescent properties studied. The formation of the investigated phthalocyanine complexes central magnesium ions led to stabilization macrocyclic molecules solution, preventing aggregation through specific universal solvation. From meta-substitution para-substitution, insignificant changes observed. exhibited higher values molar light absorption coefficients fluorescence quantum yields (up 55%) compared ligands. efficiency both fluorescence-quenching singlet oxygen generation processes case [3/4-(3,4-dicyanophenoxy)phenoxy]phthalocyaninates was found exceed that unsubstituted zinc phthalocyaninate, which suggests potential applicability these as PDT sensitizers.