A Mechanistic Dichotomy in Two‐Electron Reduction of Dioxygen Catalyzed by N, N'‐Dimethylated Porphyrin Isomers. Issue 46 (28th July 2020)

• Record Type: Journal Article
• Authors: Suzuki, Wataru; Kotani, Hiroaki; Ishizuka, Tomoya; Kojima, Takahiko
• Is Part Of: Chemistry. Volume 26:Issue 46(2020)
• Page Start: 10480
• Page End: 10486
• Publication Date: 2020-07-28
• Subjects: hydrogen bonding -- isophlorin -- non-planar porphyrin -- organocatalysts -- oxygen reduction reaction (ORR); Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202000942
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Selective two‐electron reduction of dioxygen (O2 ) to hydrogen peroxide (H2 O2 ) has been achieved by two saddle‐distorted N, N '‐dimethylated porphyrin isomers, an N 21, N '22‐dimethylated porphyrin ( anti ‐Me2 P ) and an N 21, N '23‐dimethylated porphyrin ( syn ‐Me2 P ) as catalysts and ferrocene derivatives as electron donors in the presence of protic acids in acetonitrile. The higher catalytic performance in an oxygen reduction reaction (ORR) was achieved by anti ‐Me2 P with higher turnover number (TON=250 for 30 min) than that by syn ‐Me2 P (TON=218 for 60 min). The reactive intermediates in the catalytic ORR were confirmed to be the corresponding isophlorins ( anti ‐Me2 Iph or syn ‐Me2 Iph ) by spectroscopic measurements. The rate‐determining step in the catalytic ORRs was concluded to be proton‐coupled electron‐transfer reduction of O2 with isophlorins based on kinetic analysis. The ORR rate by anti ‐Me2 Iph was accelerated by external protons, judging from the dependence of the observed initial rates on acid concentrations. In contrast, no acceleration of the ORR rate with syn ‐Me2 Iph by external protons was observed. The different mechanisms in the O2 reduction by the two isomers should be derived from that of the arrangement of hydrogen bonding of a O2 with inner N H protons of the isophlorins. Abstract : Selective two‐electron reduction of dioxygen to hydrogen peroxide has been achieved using two N, N '‐dimethylated porphyrin isomers as catalysts. Based on kinetic analysis, the different positions of pyrrolic protons in reduced porphyrinoids cause changes in the reaction mechanisms of dioxygen reduction with regard to the proton source of H2 O2, whether pyrrole N−H protons or external protons.