Skip directly to content

Minimize RSR Award Detail

Research Spending & Results

Award Detail

Doing Business As Name:Iowa State University
  • Arthur Winter
  • (515) 294-5225
Award Date:04/28/2021
Estimated Total Award Amount: $ 460,000
Funds Obligated to Date: $ 460,000
  • FY 2021=$460,000
Start Date:05/01/2021
End Date:04/30/2024
Transaction Type:Grant
Awarding Agency Code:4900
Funding Agency Code:4900
CFDA Number:47.049
Primary Program Source:040100 NSF RESEARCH & RELATED ACTIVIT
Award Title or Description:Theoretical and Experimental Investigations of Photoheterolysis Reactions
Federal Award ID Number:2055335
DUNS ID:005309844
Parent DUNS ID:005309844
Program:Chem Struct,Dynmcs&Mechansms B
Program Officer:
  • Richard Johnson
  • (703) 292-8840

Awardee Location

Street:1138 Pearson
Awardee Cong. District:04

Primary Place of Performance

Organization Name:Iowa State University
Cong. District:04

Abstract at Time of Award

With this award, the Chemical Structure Dynamics and Mechanisms-B program is supporting fundamental research in the field of photochemistry, carried out by Arthur Winter at Iowa State University. The absorption of light by molecules can lead to cleavage of chemical bonds but it is often difficult to understand why or how specific bonds break. Dr. Winter and his students seek to understand the structure-reactivity principles for one general type of bond cleavage, specifically photochemical heterolysis of bonds between carbon and a leaving group. Heterolysis represents one of the possible ways in which a chemical bond can break, with both of the two electrons in the bond being given to one of the departing groups. Photoheterolysis reactions are important in biology, materials science and environmental chemistry. The long-term goal in this project is to create a predictive theoretical framework, which can relate chemical structure to excited state reactivity, thereby providing new guiding mechanistic principles that direct photochemical reactions. Among broader impacts activities, Professor Winter will also be involved with a Freshman Research Initiative that involves first year college students in an early multidisciplinary research experience. He will also continue to recruit undergraduates and students from underrepresented groups into his lab. To study these photoheterolysis reactions, the PI will employ a combined theoretical/experimental approach. High-level computational methods will be used to map excited state transition states and surface crossing topologies in model systems. Experimentally, spectroscopy will determine the effect of structure on the rates and mechanisms of photorelease in model systems. In particular, ultrafast femtosecond-resolved transient absorption spectroscopy will be used to determine the rates and mechanisms of photoheterolysis reactions on selected substrates, while high-level excited state calculations will be used to provide a mechanistic rationale. This research will provide a broad range of training for undergraduate and graduate students. This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

For specific questions or comments about this information including the NSF Project Outcomes Report, contact us.