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Issue 11, 2020
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Mechanochemical insertion of cobalt into porphyrinoids using Co2(CO)8 as a cobalt source

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Abstract

Cobalt porphyrinoids find broad use as catalysts or electrode materials. Traditional solution state cobalt insertion reactions into a free base porphyrinoid to generate the corresponding cobalt complex generally require fairly harsh conditions, involving the heating of the reactants in high-boiling solvents for extended period of times. We report here an alternative method of cobalt insertion: A solvent-free (at least for the insertion step) mechanochemical method using a planetary ball mill with Co2(CO)8 as a cobalt source. The scope and limits of the reaction were investigated with respect to the porphyrinic substrate susceptible to the reaction conditions, the influences of different grinding aids, and bases added. While the mechanochemical method is, like other metal insertion methods into porphyrinoids, not universally suitable for all substrates tested, it is faster, milder, and greener for several others, when compared to established solution-based methods.

Graphical abstract: Mechanochemical insertion of cobalt into porphyrinoids using Co2(CO)8 as a cobalt source

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Supplementary files

Article information


Submitted
21 Mar 2020
Accepted
12 May 2020
First published
12 May 2020

Green Chem., 2020,22, 3643-3652
Article type
Paper

Mechanochemical insertion of cobalt into porphyrinoids using Co2(CO)8 as a cobalt source

D. Damunupola, N. Chaudhri, A. O. Atoyebi and C. Brückner, Green Chem., 2020, 22, 3643
DOI: 10.1039/D0GC01010C

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