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DTSTART;TZID=America/Los_Angeles:20210929T160000
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DTSTAMP:20260617T051200
CREATED:20210816T212938Z
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UID:13518-1632931200-1632931200@www.chemistry.ucla.edu
SUMMARY:Chem 278: Dr. Jesse Peltier
DESCRIPTION:“Cyclic (alkyl)(amino)carbenes: from Replacing Metals to Metal Replacement” \nAbstract: Stable singlet carbenes are flourishing with a diversity of applications: from ligands in catalysis to the stabilization of otherwise unisolable chemical species. Here\, I will showcase the diverse and rich chemistry of cyclic (alkyl)(amino)carbenes (CAACs)\, a class of stable singlet carbenes known for their high ambiphilic character. Deviating from typical carbene-organocatalysis\, which is still dominated by Lewis basic carbenes\, I will demonstrate that CAACs allow for the catalytic valorization of carbon monoxide\, a small molecule known for its inertness. I will explain how the intrinsic properties of CAACs\, carbenes known to mimic the electronic properties of transition metals\, enable this traditionally transition metal catalyzed process. Afterward\, I will discuss a methodology to achieve the absolute templating of coinage metal clusters by means of galvanic metal replacement. Interestingly\, clusters\, as opposed to larger nanomaterials\, have broadly displayed the opposite process\, anti-galvanic exchange (AGR). This can be attributed to a lack of stable active metal clusters and a lack of strong M0 character in existing ones. To access low-valent active metal clusters\, I will illustrate how CAACs’ ambiphilicity can be exploited to stabilize these highly reactive species and achieve the complete galvanic exchange in metal clusters. Going a step further\, I will discuss how these molecular models allowed us to better understand the reactivity of M(111) surfaces further delineating the intermediacy of clusters between homogenous and heterogeneous processes.
URL:https://www.chemistry.ucla.edu/seminars/chem-278-dr-jesse-peltier/
CATEGORIES:Inorganic Chemistry,Seminars
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