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Title: Synergistic Porosity and Charge Effects in a Supramolecular Porphyrin Cage Promote Efficient Photocatalytic CO2 Reduction**

Abstract

Abstract We present a supramolecular approach to catalyzing photochemical CO 2 reduction through second‐sphere porosity and charge effects. An iron porphyrin box ( PB ) bearing 24 cationic groups, FePB‐2(P) , was made via post‐synthetic modification of an alkyne‐functionalized supramolecular synthon. FePB‐2(P) promotes the photochemical CO 2 reduction reaction (CO 2 RR) with 97 % selectivity for CO product, achieving turnover numbers (TON) exceeding 7000 and initial turnover frequencies (TOF max ) reaching 1400 min −1 . The cooperativity between porosity and charge results in a 41‐fold increase in activity relative to the parent Fe tetraphenylporphyrin ( FeTPP ) catalyst, which is far greater than analogs that augment catalysis through porosity ( FePB‐3(N ), 4‐fold increase) or charge (Fe p ‐tetramethylanilinium porphyrin ( Fe‐ p ‐TMA ), 6‐fold increase) alone. This work establishes that synergistic pendants in the secondary coordination sphere can be leveraged as a design element to augment catalysis at primary active sites within confined spaces.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); National Institutes of Health (NIH)
OSTI Identifier:
2246868
Alternate Identifier(s):
OSTI ID: 1905941
Grant/Contract Number:  
AC02-05CH11231; S10OD024998
Resource Type:
Accepted Manuscript
Journal Name:
Angewandte Chemie (International Edition)
Additional Journal Information:
Journal Name: Angewandte Chemie (International Edition); Journal Volume: 62; Journal Issue: 5; Journal ID: ISSN 1433-7851
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Carbon Dioxide Reduction; Electrocatalysis; Photocatalysis; Porous Cage; Second-Sphere

Citation Formats

An, Lun, De La Torre, Patricia, Smith, Peter T., Narouz, Mina R., and Chang, Christopher J. Synergistic Porosity and Charge Effects in a Supramolecular Porphyrin Cage Promote Efficient Photocatalytic CO2 Reduction**. United States: N. p., 2022. Web. doi:10.1002/anie.202209396.
An, Lun, De La Torre, Patricia, Smith, Peter T., Narouz, Mina R., & Chang, Christopher J. Synergistic Porosity and Charge Effects in a Supramolecular Porphyrin Cage Promote Efficient Photocatalytic CO2 Reduction**. United States. https://doi.org/10.1002/anie.202209396
An, Lun, De La Torre, Patricia, Smith, Peter T., Narouz, Mina R., and Chang, Christopher J. Tue . "Synergistic Porosity and Charge Effects in a Supramolecular Porphyrin Cage Promote Efficient Photocatalytic CO2 Reduction**". United States. https://doi.org/10.1002/anie.202209396. https://www.osti.gov/servlets/purl/2246868.
@article{osti_2246868,
title = {Synergistic Porosity and Charge Effects in a Supramolecular Porphyrin Cage Promote Efficient Photocatalytic CO2 Reduction**},
author = {An, Lun and De La Torre, Patricia and Smith, Peter T. and Narouz, Mina R. and Chang, Christopher J.},
abstractNote = {Abstract We present a supramolecular approach to catalyzing photochemical CO 2 reduction through second‐sphere porosity and charge effects. An iron porphyrin box ( PB ) bearing 24 cationic groups, FePB‐2(P) , was made via post‐synthetic modification of an alkyne‐functionalized supramolecular synthon. FePB‐2(P) promotes the photochemical CO 2 reduction reaction (CO 2 RR) with 97 % selectivity for CO product, achieving turnover numbers (TON) exceeding 7000 and initial turnover frequencies (TOF max ) reaching 1400 min −1 . The cooperativity between porosity and charge results in a 41‐fold increase in activity relative to the parent Fe tetraphenylporphyrin ( FeTPP ) catalyst, which is far greater than analogs that augment catalysis through porosity ( FePB‐3(N ), 4‐fold increase) or charge (Fe p ‐tetramethylanilinium porphyrin ( Fe‐ p ‐TMA ), 6‐fold increase) alone. This work establishes that synergistic pendants in the secondary coordination sphere can be leveraged as a design element to augment catalysis at primary active sites within confined spaces.},
doi = {10.1002/anie.202209396},
journal = {Angewandte Chemie (International Edition)},
number = 5,
volume = 62,
place = {United States},
year = {Tue Dec 20 00:00:00 EST 2022},
month = {Tue Dec 20 00:00:00 EST 2022}
}

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CO 2 Reduction: From Homogeneous to Heterogeneous Electrocatalysis
journal, December 2019


Iron Porphyrins Embedded into a Supramolecular Porous Organic Cage for Electrochemical CO 2 Reduction in Water
journal, July 2018

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Synergistic electroreduction of carbon dioxide to carbon monoxide on bimetallic layered conjugated metal-organic frameworks
journal, March 2020


A Local Proton Source Enhances CO 2 Electroreduction to CO by a Molecular Fe Catalyst
journal, October 2012


Metal–Ligand Cooperativity via Exchange Coupling Promotes Iron- Catalyzed Electrochemical CO 2 Reduction at Low Overpotentials
journal, November 2020

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Templating Bicarbonate in the Second Coordination Sphere Enhances Electrochemical CO 2 Reduction Catalyzed by Iron Porphyrins
journal, June 2022

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Urea-Based Multipoint Hydrogen-Bond Donor Additive Promotes Electrochemical CO 2 Reduction Catalyzed by Nickel Cyclam
journal, July 2018


Positional effects of second-sphere amide pendants on electrochemical CO 2 reduction catalyzed by iron porphyrins
journal, January 2018

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journal, September 2021

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Maximizing Electroactive Sites in a Three‐Dimensional Covalent Organic Framework for Significantly Improved Carbon Dioxide Reduction Electrocatalysis
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Porphyrin Boxes: Rationally Designed Porous Organic Cages
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A Stepwise Huisgen Cycloaddition Process: Copper(I)-Catalyzed Regioselective “Ligation” of Azides and Terminal Alkynes
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