Issue 2, 2017

Cobalt complexes of pyrrolecarboxamide ligands as catalysts in nitro reduction reactions: influence of electronic substituents on catalysis and mechanistic insights

Abstract

This work presents two square-planar Co(III) complexes within a N4 coordination sphere created by two related pyrrolecarboxamide ligands. Both complexes functioned as catalysts for the hydrazine-mediated reduction of aromatic, heterocyclic, as well as aliphatic nitro substrates. Binding studies provided evidence that the square-planar Co(III) complexes bind two equivalents of a substrate whereas mechanistic studies established the involvement of a Co3+–Co2+ based redox cycle in the catalysis. The Co(III) complex having electron-withdrawing –Cl substituents on the ligand was noted to be a much better catalyst than the one with electron-donating –CH3 substituents.

Graphical abstract: Cobalt complexes of pyrrolecarboxamide ligands as catalysts in nitro reduction reactions: influence of electronic substituents on catalysis and mechanistic insights

Supplementary files

Article information

Article type
Research Article
Submitted
20 Sep 2016
Accepted
09 Dec 2016
First published
09 Dec 2016

Inorg. Chem. Front., 2017,4, 324-335

Cobalt complexes of pyrrolecarboxamide ligands as catalysts in nitro reduction reactions: influence of electronic substituents on catalysis and mechanistic insights

S. Yadav, S. Kumar and R. Gupta, Inorg. Chem. Front., 2017, 4, 324 DOI: 10.1039/C6QI00389C

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