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DTSTAMP:20260928T135332
DTSTART;TZID=America/Detroit:20261008T160000
DTEND;TZID=America/Detroit:20261008T173000
SUMMARY:Workshop / Seminar:From Spontaneous to Stimulated Emission: Quantum Optical Probes for Supramolecular Organization
DESCRIPTION:Quantum statistical properties of fluorescence emitted spontaneously in random directions underpin a variety of experimental methods for determining molecular interactions in both test tubes and biological cells. I will begin this talk with a brief overview of a method developed in my lab\, dubbed Fluorescence Intensity Fluctuation (FIF) Spectrometry\, which probes spatial fluctuations in fluorescence intensities from fluorescently labeled proteins to determine the number of subunits comprising a complex. I will then present Förster Resonance Energy Transfer (FRET) Spectrometry and its application to determination of the relative distances between and orientation of fluorescent molecules within a complex via energy transfer between their transition dipoles. In the third part of the talk\, I will introduce a mathematical framework for quantization of electromagnetic fields emitted by single dipole radiators\, which predicts both the directionality of photon emission probability and light-stimulated electromagnetic wave collapse. I will conclude by presenting preliminary experimental results testing these effects. These quantum phenomena could lead to new methods for directly determining protein orientation within complexes\, complementing the spontaneous emission-based methods.
UID:151811-21912212@events.umich.edu
URL:https://events.umich.edu/event/151811
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Chemistry,Physical Chemistry
LOCATION:Chemistry Dow Lab - CHEM 1640
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260928T140226
DTSTART;TZID=America/Detroit:20261015T160000
DTEND;TZID=America/Detroit:20261015T173000
SUMMARY:Workshop / Seminar:Catalyst Discovery for Metal-free\, Photoredox CO2 Reduction
DESCRIPTION:Our goal is to identify sustainable\, light-driven routes for CO2 utilization. Prior experiments show that upon excitation by light and subsequent reduction\, a simple organic chromophore\, p-terphenyl\, can reduce and transform CO2 into valuable molecules such as amino acids. These photoredox reactions are attractive because organic chromophores are metal-free and can access highly reactive states upon excitation and quenching that are otherwise energy-intensive. However\, the steps of the photoredox cycle and the reasons for the low turnover numbers of these catalysts are poorly understood. We use state-of-the-art quantum chemistry methods and automated workflows to delineate mechanisms of steps constituting the catalytic cycle\, develop design principles\, and leverage these insights to drive the discovery of viable chromophores. The driving force for the desired electron transfer (ET) step to reduce CO2 cannot be increased without simultaneously increasing that for competing deactivation via carboxylation\; this indicates the existence of fundamental relationships that limit catalyst performance. Deactivation can also occur via Birch reduction of the catalyst by the radical cation form of the sacrificial electron donor. These steps are highly sensitive to the choice of solvent\, as is the quenching of the excited-state catalyst. I will describe our work establishing a protocol for calculating and characterizing excited-state complexes (exciplexes) that are the result of incomplete quenching. I will also share our recent efforts towards applying structural causal frameworks to photoredox chemistry.
UID:151929-21912474@events.umich.edu
URL:https://events.umich.edu/event/151929
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Chemistry,Physical Chemistry
LOCATION:Chemistry Dow Lab - CHEM 1640
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260928T140450
DTSTART;TZID=America/Detroit:20261022T160000
DTEND;TZID=America/Detroit:20261022T171500
SUMMARY:Workshop / Seminar:Amber Krummel Seminar
DESCRIPTION:TBD
UID:151931-21912477@events.umich.edu
URL:https://events.umich.edu/event/151931
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Chemistry,Physical Chemistry
LOCATION:Chemistry Dow Lab - CHEM 1640
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260928T141412
DTSTART;TZID=America/Detroit:20270204T160000
DTEND;TZID=America/Detroit:20270204T173000
SUMMARY:Workshop / Seminar:Mikael Backlund Seminar
DESCRIPTION:TBD
UID:152374-21913604@events.umich.edu
URL:https://events.umich.edu/event/152374
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Chemistry,Physical Chemistry
LOCATION:Chemistry Dow Lab - CHEM 1640
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260928T143639
DTSTART;TZID=America/Detroit:20270318T160000
DTEND;TZID=America/Detroit:20270318T173000
SUMMARY:Workshop / Seminar:Dvira Segal Seminar
DESCRIPTION:TBD
UID:152389-21913625@events.umich.edu
URL:https://events.umich.edu/event/152389
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Chemistry,Physical Chemistry
LOCATION:Chemistry Dow Lab - CHEM 1640
CONTACT:
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