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Related Experiment Video

Updated: Jan 25, 2026

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Manganese-Mediated Formic Acid Dehydrogenation.

Nickolas H Anderson1, James Boncella1, Aaron M Tondreau1

  • 1Chemistry Division, Los Alamos National Laboratory, MS J514, Los Alamos, New Mexico, 87545, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 9, 2019
PubMed
Summary
This summary is machine-generated.

A new manganese catalyst supported by a hybrid ligand demonstrates robust and rapid formic acid dehydrogenation. This efficient system achieves high turnover frequencies, rivaling noble metal catalysts for hydrogen production.

Keywords:
PNNOPcatalysisdehydrogenationformic acidmanganese

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Hydrogen Storage

Background:

  • Developing efficient catalysts for formic acid dehydrogenation is crucial for hydrogen storage and clean energy applications.
  • Noble metal catalysts are effective but expensive and scarce.
  • Manganese-based catalysts offer a potentially more sustainable alternative.

Purpose of the Study:

  • To report a novel manganese catalyst supported by a hybrid backbone chelate ligand, tBu PNNOP.
  • To evaluate the catalytic performance of this manganese complex in formic acid dehydrogenation.
  • To compare its efficiency with related manganese complexes featuring parent chelates.

Main Methods:

  • Synthesis of manganese complexes using MnBrCO5 and the tBu PNNOP ligand.
  • Preparation of the neutral five-coordinate complex via dehydrohalogenation.
  • Catalytic testing of formic acid dehydrogenation using the synthesized manganese complexes.

Main Results:

  • The hybrid-ligand supported manganese catalyst [(tBu PNNOP)Mn(CO)2 ][Br] (2) and its derived complex (3) exhibit high efficiency in formic acid dehydrogenation.
  • Turnover frequencies (TOFs) exceeding 8500 h-1 were achieved, comparable to noble metal catalysts.
  • The catalyst with the hybrid ligand (2) demonstrated superior performance compared to those with parent chelates (4 and 5).

Conclusions:

  • The developed manganese catalyst featuring the tBu PNNOP hybrid ligand is a robust and highly active system for formic acid dehydrogenation.
  • This catalyst offers a promising, cost-effective alternative to noble metal catalysts for hydrogen generation.
  • The unique structure of the hybrid ligand plays a key role in the enhanced catalytic activity.