Canceled: Spring Chem501 Seminar
UT Host: Dr. Ziling(Ben) Xue
Speaker: Dr. Martin Kirk
Distinguished University Professor
University of New Mexico
Title: “Donor-Acceptor Systems Provide Insight into Charge Separation, Charge Transport, and Excited State Processes”
Abstract: Excited state interactions in spin-containing Donor-Acceptor and Donor-Bridge-Acceptor systems are important for understanding the impact of electronic coupling (Hab) to molecular electronics and how magnetic exchange interactions affect excited state processes. Our efforts have focused on determining excited state contributions to molecular bridge mediated electronic coupling, understanding how open-shell excited state singlet configurations promote long-range electron correlation, and developing new platforms for spin control of excited state dynamics in photoexcited donor-acceptor molecules. Using novel Donor-Bridge-Acceptor biradical and related complexes, we have been able to test recent theoretical hypotheses in molecular electronics as they relate to coherent superexchange in electron transfer/transport conduits, spin-polarized electron transport, and the control of quantum interference effects. Radical elaborated transition metal complexes represent ideal platforms for exploring the relationship between photoinduced charge separation and long-range spin correlation, impacting the solar energy, organic lighting, and molecular spintronics fields. These systems are also relevant to the emerging molecular quantum information science (QIS) field, allowing for the optical generation and manipulation of spin qubits. Here we will show how a combined spectroscopic approach, augmented by detailed bonding calculations, has provided keen insight into the electronic structure of these novel transition metal – radical complexes to further our understanding of molecular electronic systems at the nanoscale.
Bio: Martin L. Kirk is Distinguished University Professor of Chemistry at The University of New Mexico. His research program focuses on (1) spectroscopic, synthetic, biochemical, and computational studies of pyranopterin molybdenum enzymes and models, and (2) detailed magnetic, spectroscopic and theoretical studies of spin containing molecular systems in the context of molecular electronics. He was a research fellow (7/03-1/04) at the Glenn T. Seaborg Institute Los Alamos National Laboratories during a sabbatical leave. He was a National Science Foundation Postdoctoral Fellow (1990-1993, Stanford University) with E. I. Solomon, completed his Ph.D. in 1990 at The University of North Carolina at Chapel Hill with W. E. Hatfield, and obtained his B.S. in 1985 at West Virginia University performing undergraduate research with Naresh Dalal. Most recently, he was a Guest Editor (with Prof. D. A. Shultz) for Molecular Spintronics: a web themed issue in Chemical Communications (2014), and co-edited a three volume book series for the Royal Society of Chemistry entitled Molybdenum and Tungsten Enzymes (2017). Prof. Kirk has served on the Editorial Board for Inorganic Chemistry, was a prior ACS Inorganic Division Chair of the Bioinorganic Subdivision, and a Chair of the Gordon Research Conference on Molybdenum and Tungsten Enzymes. He is an Associated Faculty of the UNM Nanoscience and Microsystems Graduate Program, a Member of the UNM Center for High Technology Materials, and currently serves on the Advisory Boards of the NM Tech Department of Chemistry and the UNM Center for High Technology Materials.
Thursday, April 2, 2020 at 3:45pm to 5:00pm
Buehler Hall, 555
1420 Circle Drive, Knoxville, TN 37996