Köksoy, Baybars2026-02-082026-02-0820222149-0120https://hdl.handle.net/20.500.12885/4297In this study, five novel mono rare earth metallo phthalocyanine derivatives (1a-e) were synthesized by cyclotetramerization of 4-iodophthalonitrile and corresponding metal salts. These novel compounds were characterized by IR, elemental analyses, UV–vis, and MALDI-TOF spectral data. Moreover, the ability of singlet oxygen generation and aggregation behaviour of these phthaloyanines were investigated in dimethyl sulfoxide using UV-Vis spectroscopy. Gadolinium metallo phthalocyanine has the best singlet oxygen quantum yield and it can be a potential candidate for the photodynamic therapy (PDT) of cancer.eninfo:eu-repo/semantics/openAccessInorganic Chemistryİnorganik KimyaArticle937417502-s2.0-85134180927N/A1116435