Novel symmetrical and unsymmetrical fluorine-containing metallophthalocyanines: synthesis, characterization and investigation of their biological properties

Dalton Trans. 2021 May 5. doi: 10.1039/d1dt00991e. Online ahead of print.


In this study, a new fluorinated phthalonitrile compound namely 5-bis[4-(trifluoromethoxy)-thiophenyl] phthalonitrile was synthesized. In addition, peripherally substituted symmetric metallated phthalocyanine derivatives [M = Co (2) and M = Zn (3)] and unsymmetrically substituted zinc phthalocyanine (ZnPc) complex (4) were synthesized by cyclotetramerization of this phthalonitrile compound. Characterization of all new compounds was carried out using FT-IR, NMR, UV-Vis, and mass spectroscopy. Additionally, antioxidant activity, DNA cleavage activity, antimicrobial activity, biofilm inhibition activity, and bacterial viability inhibition test of the compounds (1-4) were investigated. The antioxidant activities of the new phthalocyanine complexes were studied by performing two different methods. The results indicated that the highest DPPH (1,1-diphenyl-2-picrylhydrazyl) free radical scavenging activity was determined to be 67.85% for 2 and also 3 showed the highest activity with 31.65% for chelating activity at 200 mg L-1 concentration. Phthalocyanine compounds demonstrated effective DNA cleavage and antimicrobial activities. The highest percentage of cell vitality inhibition was found for compound 4, 56.92%. Also, test compounds exhibited good biofilm inhibition activity.