Tuning the Reactivity of Cofacial Porphyrin Prisms for Oxygen Reduction Using Modular Building BlocksClick to copy article linkArticle link copied!
- Matthew R. CrawleyMatthew R. CrawleyDepartment of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United StatesMore by Matthew R. Crawley
- Daoyang ZhangDaoyang ZhangDepartment of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United StatesMore by Daoyang Zhang
- Amanda N. OldacreAmanda N. OldacreDepartment of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United StatesMore by Amanda N. Oldacre
- Christine M. BeaversChristine M. BeaversAdvanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United StatesMore by Christine M. Beavers
- Alan E. FriedmanAlan E. FriedmanDepartment of Materials, Design, and Innovation, University at Buffalo, The State University of New York, Buffalo, New York 14260, United StatesMore by Alan E. Friedman
- Timothy R. Cook*Timothy R. Cook*(T.R.C.) Email: [email protected]Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United StatesMore by Timothy R. Cook
Abstract

We assembled eight cofacial porphyrin prisms using MTPyP (M = Co(II) or Zn(II), TPyP = 4-tetrapyridylporphyrin) and functionalized ruthenium-based “molecular clips” using coordination-driven self-assembly. Our approach allows for the rapid synthesis of these architectures in isolated yields as high as 98% for the assembly step. Structural and reactivity studies provided a deeper understanding of the role of the building blocks on the oxygen reduction reaction (ORR). Catalytic efficacy was probed by using cyclic and hydrodynamic voltammetry on heterogeneous catalyst inks in aqueous media. The reported prisms showed outstanding selectivity (>98%) for the kinetically hindered 4e–/4H+ reduction of O2 to H2O over the kinetically more accessible 2e–/2H+ reduction to H2O2. Furthermore, we have demonstrated significant cofacial enhancement in the observed catalytic rate constant ks (∼5 orders of magnitude) over the mononuclear analogue. We conclude that the steric bulk of the clip plays an important role in the structural dynamics of these prisms, which in turn modulates the ORR reactivity with respect to selectivity and kinetics.
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