PhenTAA: A Redox-Active N₄-Macrocyclic Ligand Featuring Donor and Acceptor Moieties.

ABSTRACT: Here, we present the development and characterization of the novel PhenTAA macrocycle as well as a series of [Ni(R₂PhenTAA)]ⁿ complexes featuring two sites for ligand-centered redox-activity. These differ in the substituent R (R = H, Me, or Ph) and overall charge of the complex n (n = -2, -1, 0, +1, or +2). Electrochemical and spectroscopic techniques (CV, UV/vis-SEC, X-band EPR) reveal that all redox events of the [Ni(R₂PhenTAA)] complexes are ligand-based, with accessible ligand charges of -2, -1, 0, +1, and +2. The o-phenylenediamide (OPD) group functions as the electron donor, while the imine moieties act as electron acceptors. The flanking o-aminobenzaldimine groups delocalize spin density in both the oxidized and reduced ligand states. T

SUBMITTER: Epping RFJ 

PROVIDER: S-EPMC10828995 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature