Secondary coordination sphere plays a key role in correlation between the structure and function of a metal complex. One of the important noncovalent interactions in secondary coordination sphere is hydrogen bonding that also has been observed in the active site of some metalloenzymes. Fine tuning of hydrogen bonding interaction via a smart design of a ligand framework is an approach that inorganic chemists apply to regulate target properties and reactivity.<br/>In this study, we explore the structure and spectroscopic properties of a family of copper, nickel and palladium complexes bearing bidentate redox-active ligands that contain H-bonding donor and H-bonding acceptor groups. Single crystal X-ray crystallography shows intramolecular H-bonding interactions between the two ligand scaffolds can be finely tuned by different factors including metal center, ligand substitution, solvent of crystallization as well as counterion of the metal complex. Interestingly, the ability to control the intramolecular H-bonding interaction forces the complexes to adopt a certain geometry which can eventually permit to control the reactivity and catalytic performance of these complexes.

Coordination chemistry of copper, nickel and palladium complexes bearing bidentate redox-active ligands with tunable H-bonding donors and acceptors

ACS Spring Meeting 2021

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