Hydrogen atom abstraction as a synthetic route to a square planar Co^II complex with a redox-active tetradentate PNNP ligand.

ABSTRACT: Redox-active ligands improve the reactivity of transition metal complexes by facilitating redox processes independent of the transition metal center. A tetradentate square planar (PNCH₂CH₂NP)Co^II (1) complex was synthesized and the ethylene backbone was dehydrogenated through hydrogen atom abstraction to afford (PNCHCHNP)Co^II (2), which now contains a redox-active ligand. The ligand backbone of 2 can be readily hydrogenated with H₂ to regenerate 1. Reduction of 1 and 2 with KC₈ in the presence of 18-crown-6 results in cobalt-based reductions to afford [(PNCH₂CH₂NP)Co^I][K(18-crown-6)] (3) and [(PNCHCHNP)Co^I][K(18-crown-6)] (4), respectively. Cyclic voltammetry revealed two reversibl

SUBMITTER: Miller JD 

PROVIDER: S-EPMC11362828 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature