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DTSTART;TZID=America/Los_Angeles:20220203T120000
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DTSTAMP:20260614T203808
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LAST-MODIFIED:20220120T221322Z
UID:13595-1643889600-1643889600@www.chemistry.ucla.edu
SUMMARY:Physical Chemistry Seminar: Dr. Daniel Straus\, Princeton University
DESCRIPTION:Structural Surprises in Inorganic and Molecular Materials \nEven in some of the most heavily studied materials\, a careful structural analysis can solve stubborn mysteries. The first part of my talk focuses on cesium lead iodide (CsPbI3)\, an inorganic halide perovskite of interest for solar energy conversion that is unstable at room temperature. I use X-ray diffraction measurements to reveal that that the Cs atom rattles within its coordination polyhedron\, causing the material’s thermodynamic instability. Next\, I demonstrate the remarkable emergence of chirality in the self-assembled molecular material C60(SnI4)2\, despite the very high icosahedral and tetrahedral symmetry of its constituent molecules. These results demonstrate that almost any molecular\, nanocrystalline\, or engineered precursor can be considered when designing chiral assemblies\, allowing new classes of optical devices\, asymmetric catalysts\, and biological sensors to be imagined.
URL:https://www.chemistry.ucla.edu/seminars/physical-chemistry-seminar-dr-daniel-straus-princeton-university/
CATEGORIES:Physical Chemistry Seminar,Seminars
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DTSTART;TZID=America/Los_Angeles:20220203T160000
DTEND;TZID=America/Los_Angeles:20220203T160000
DTSTAMP:20260614T203808
CREATED:20210816T221633Z
LAST-MODIFIED:20210816T221633Z
UID:13532-1643904000-1643904000@www.chemistry.ucla.edu
SUMMARY:New Base-Promoted Reductive and Oxidative Coupling Reactions
DESCRIPTION:Abstract: Base-catalyzed reactions typically accomplish redox neutral transformations\, such as the addition of pronucleophiles to electrophiles. Our group is developing mechanistic platforms for base-promoted reductive and oxidative coupling reactions to expand the capabilities of basic chemistry. This talk will discuss the development and synthetic potential of these processes in the context of two methodologies. This includes the reductive defluorinative coupling of trifluoromethylarenes with electrophiles and the oxidative coupling of arenes with nucleophiles. Mechanistic studies will also be included to highlight the generality and future applications of these new base-promoted processes.
URL:https://www.chemistry.ucla.edu/seminars/tba-13/
CATEGORIES:Organic Colloquium,Seminars
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