Unusual Oxidation States

Nature uses high oxidation state metal centers to perform a variety of important transformations, including C-H bond activation and O-O bond formation.  Additionally, transition metal ions in the 4+ oxidation state are often cited as intermediates in numerous catalytic transformations, such as water oxidation.  However, isolation of these intermediates has proven difficult due to their reactive, and often highly oxidizing, nature. The Hayton group has been exploring the ability of the ketimide ligand, [N=CR2]-, to stabilize transition metal complexes in the 4+ oxidation state, and have successfully isolated a novel series of M(IV) tetra(ketimide) complexes, M(N=CtBu2)4 (M = Mn, Fe, Co).  We employ a number of characterization methods to explore the properties of these materials, including NMR, IR, EPR, and UV/vis-NIR spectroscopies, SQUID magnetometry, and cyclic voltammetry.  We are currently exploring the reactivity of these complexes in an effort to better understand the properties of high oxidation state metal ions.

Publications

Researchers

Trevor W. Hayton

Our research involves the synthesis and characterization of new inorganic and organometallic complexes and materials. One goal of this work is to improve our understanding of the structure and bonding in transition metal, lanthanide, and actinide systems, as well as nanoclusters. We are also trying to discover new organic transformations mediated by metal centers.

Peter Damon

Peter is currently working on expanding our understanding of the ketimide (N=CR2)- ligand by characterizing new transition metal ketimide complexes.

Sheila Kulkarni

Sheila is working on the synthesis of homoleptic uranium(V) pnictogenides and chalcogenides for spectroscopic analysis.

Daniel Najera

Daniel is working on the synthesis and characterization of Pd and Pt ketimide complexes.

 

Richard Neal

Richard is exploring the ability of new ketimide ligands to stabilize high oxidation states in the lanthanides.