Abstract
AbstractHerein, we report the application of a meso‐substituted porphyrin dyad entangled with carboxyl functionalized benzimidazolium moieties (CPDCFBM) as a heterogeneous photocatalyst for C−H activation of various electron‐donating and withdrawing aromatic compounds with highly inactivated aryl fluoride, chlorides, and other aryl bromides. A simple methodology adopted to synthesize the corresponding product has received an outstanding yield from (69–88 %) under 5 W illumination using a homemade photoreactor assembly. CPDCFBM tolerated various functional groups with recyclability up to five runs without much decline in photocatalytic activity. Photogenerated excitons vitality in the reaction was analyzed using K2S2O8 and KI. CPDCFBM was shown a Hammett acidity value of 0.77. The reaction conditions were optimized as; time (18 h), catalyst (15 mg), and light illumination (5 W) from an LED source using ethanol as an eco‐friendly solvent. The products obtained were crystalline and therefore need no further purification. The electroanalytical study revealed HOMO and LUMO energy of −5.841 and −4.066 respectively accounting for an energy gap of, 1.7 eV.
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