Investigation of photocatalytic properties of cobalt phthalocyanines on benzyl alcohol photoxidation
Halise Yalazan, Çağla Akkol, Ece Tuğba Saka, Halıt Kantekın
Abstract
Photocatalysis is a fast and economically attractive option for oxidation reactions. Herein, 4‐(5‐iodopyridin‐2‐yloxy)phthalocyaninato cobalt(II) ( P‐CoPc ) and 4‐(4‐methylquinolin‐2‐yloxy)phthalocyaninato cobalt(II) ( Q‐CoPc ) were synthesized and characterized with spectroscopic data (FT‐IR, UV‐Vis, and mass spectra). The parameters affecting the photocatalytic activity such as substrate amount, oxidant type, substitution group, and solvent effect were studied. Both catalysts show high benzaldehyde selectivity with high TON and TOF values (470 and 1880 for P‐CoPc and 375 and 1500 for Q‐CoPc , respectively). The best photoxidation conditions were determined that 1/1500/500 (cat/subs./ox. ratio) in DMSO and in the presence of light. Aggregation and photodegradation studies of P‐CoPc and Q‐CoPc have also carried out in this work.