Coordination modes: Flexidentate pyridine‐substituted ligand designs allow facile and modular assembly of dinuclear coordination compounds scaffolded with redox‐active formazanate bridging ligands. A series of dinuclear complexes of platinum and iridium are described, with a variety of ligand binding modes observed (see figure).
The utility of flexidentate pyridyl‐substituted formazanate ligands for assembling dinuclear coordination complexes with iridium(III) and/or platinum(II) building blocks is demonstrated herein. The dinuclear complexes are prepared either via a stepwise strategy, adding one metal unit at a time, or via one‐pot self‐assembly. Eight of the new complexes, including both mononuclear precursors and dinuclear products, are structurally characterized by single‐crystal X‐ray diffraction and NMR spectroscopy, revealing several distinct binding modes of the formazanates. All complexes are characterized by UV/Vis absorption spectroscopy and cyclic voltammetry. The frontier orbitals are primarily localized on the formazanate ligand, and a characteristic, intense formazanate‐centered π→π* absorption band is observed in the absorption spectra.
Wiley: Chemistry – A European Journal: Table of Contents
Authors: Ge Mu, Chenggang Jiang, Thomas S. Teets