Seth N. Brown

Seth N. Brown

Inorganic and Organic Reaction Mechanisms

Biography

2012-present
Professor, University of Notre Dame
2002-2012
Associate Professor, University of Notre Dame
1996-2002
Assistant Professor, University of Notre Dame
1994-1996
Postdoctoral Fellow, California Institute of Technology
1994
Ph.D. in Inorganic Chemistry, University of Washington
1988
B.S. in Chemistry, B.S. in Humanities and Science, Massachusetts Institute of Technology

Selected Awards

2016
ACS Division of Inorganic Chemistry Award for Undergraduate Research Mentor
2011
Fellow, American Chemical Society
2009
Rev. Edmund P. Joyce, C.S.C. Award for Excellence in Undergraduate Teaching
2008
Shilts/Leonard Award for Outstanding Teaching in the College of Science
2003, 2006
John Kaneb Award for Undergraduate Teaching
2005
University of Notre Dame Presidential Award
2004
Thomas P. Madden Award for Outstanding Teaching in the First-Year Program
1998-2002
NSF Career Award
1998-2001
Dupont Young Professor Award
1996
Camille and Henry Dreyfus Foundation New Faculty Award
1995
NIH NRSA Postdoctoral Fellowship

Research Interests

Developing Catalysis for Energy and the Environment

Enhancing our understanding of the mechanisms of chemical reactions is critical to improve processes that interconvert between chemical and electrical energy or to make chemical products in a selective and environmentally benign way.  The Brown group is addressing this general problem by making new inorganic or organometallic complexes with the aim of achieving reactivity through novel mechanisms.

Traditionally, oxidation-reduction reactions mediated by metal-containing compounds involve changes in both the oxidation state and bonding that directly involve those metal centers.  We are exploring an alternative mode of redox reactivity, what we term "nonclassical" redox reactions, where bond-making or bond-breaking events occur at a metal center but oxidations or reductions occur not at the metal center but at redox-active ligands attached to the metal.  These processes generate novel species with unusual electronic structure, which may be capable of unusual reactivity.  Furthermore, separating the locus of electron transfer from that of changes in bonding mimics the heterogeneous catalysis involved in fuel cells, suggesting that nonclassical homogeneous reactions may lead to conceptual insights or practical advances in systems for interconverting electrical and chemical energy.

In some cases, we have observed reactions where both the oxidation state changes and the bonding changes take place at the ligand rather than the metal. This has allowed us to observe reactions at coordinatively saturated or even encapsulated metal centers that would normally be considered poor choices as catalysts because of the unavailability of open sites at the metal. We are currently engaged in elucidating the effect of the metal-ligand bonding on this ligand-centered reactivity and using that information to design new catalysts with enhanced reactivity, selectivity, or durability.

Recent Papers

  • Yao, K.; Herr, J. E.; Brown, S. N.; Parkhill, J. "Intrinsic Bond Energies from a Bonds-in-Molecules Neural Network." Journal of Physical Chemistry Letters 2017, 8, 2689-2694.
  • Hoffman, J. M.; Oliver, A. G.; Brown, S. N. "The Metal or the Ligand? The Preferred Locus for Redox Changes in Oxygen Atom Transfer Reactions of Rhenium Amidodiphenoxides." J. Am. Chem. Soc. 2017, 139, 4521-4531.
  • Marshall-Roth, T.; Brown, S. N. "Redox activity and pi bonding in a tripodal seven-coordinate molybdenum(VI) tris(amidophenolate)." Dalton Transactions 2015, 44, 677-685.
  • Shekar, S.; Brown, S. N. "Mechanism and Selectivity of Methyl and Phenyl Migrations in Hypervalent Silylated lminoquinones." J. Org. Chem. 2014, 79, 12047-12055.
  • Ranis, L. G.; Werellapatha, K.; Pietrini, N. J.; Bunker, B. A.; Brown, S. N. "Metal and Ligand Effects on Bonding in Group 6 Complexes of Redox-Active Amidodiphenoxides." Inorg. Chem. 2014, 53, 10203-10216.
  • Cipressi, J.; Brown, S. N. "Octahedral to trigonal prismatic distortion driven by subjacent orbital pi antibonding interactions and modulated by ligand redox noninnocence." Chemical Communications 2014, 50, 7956-7959.

Contact Information

  • Professor
  • Office: 269 Stepan Chemistry
  • Phone: 574-631-4659
  • Send an email

Primary Research Areas

Research Specialties