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DTSTART;VALUE=DATE:20220323
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SUMMARY:National Society of Black Engineers (NSBE) Convention
DESCRIPTION:Representatives from Northeastern University Graduate School of Engineering will be participating in this event.
URL:https://coe.northeastern.edu/event/national-society-of-black-engineers-nsbe-convention/
ORGANIZER;CN="Graduate School of Engineering":MAILTO:coe-gradadmissions@northeastern.edu
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SUMMARY:Open-Shell Molecules: A Radical Design for Organic Optoelectronic Materials
DESCRIPTION:ChE Seminar Series Presents: \nDr. Mark S. Chen \nAssistant Professor \nDepartment of Chemistry\, Lehigh University \nAbstract: \nOpen-shell molecules possess unpaired electron density (radical character)\, which makes them intriguing candidate materials for many optoelectronic applications. Air-stable structures have been reported\, but most require lengthy synthetic sequences with limited generality. Our lab has developed a concise strategy for rapidly accessing a variety of bisphenalenyls from commercial starting materials. We used this method to synthesize a neutral biradicaloid\, Ph2–s-IDPL\, and several novel heteroatom-substituted\, π-radical cations. One such molecule is O-substituted (Ph2-PCPL)(OTf)\, which displays electrostatically-enhanced\, intermolecular covalent-bonding interactions that impart remarkable charge transport properties. Specifically\, we have discovered that mixing soluble PCPL derivatives with polystyrenesulfonate (PSS) enables the formation of water-processable\, n-type conductive organic films that demonstrate high optical transparency (>94% transmission)\, electrical conductivity (σrt < 117 S/cm)\, and electron mobility (μe < 322 cm2 V-1 s-1). In these composites\, PSS not only serves as a counterion\, but also promotes n-doping and solution-phase aggregation\, which leads to molecular ordering in solid-state. We have also discovered a N-substituted\, red emissive\, π-radical cation [(Ph2-PQPL)(OTf)] that is structurally distinct from all other luminescent radicals\, and achieves rare antiambipolar charge transport in field-effect transistors. N-substituted bisphenalenyls also display self-sensitized and reversible reactivity with dioxygen that shows potential for use in colorimetric oxygen sensors and for on-demand singlet oxygen release. \nBio: \nMark Chen is an Assistant Professor in the Department of Chemistry at Lehigh University. He received his B.A. and Ph.D. in Chemistry from Harvard University with M.-Christina White developing catalytic C-H bond oxidation methodologies. As a Dreyfus postdoctoral fellow in the lab of Jean Fréchet at U. C. Berkeley\, he led a team developing polymeric and molecular materials for organic electronic devices. Since coming to Lehigh University\, the Chen Lab has investigated the synthesis of open-shell organic molecules and their application to optoelectronic materials and devices. Mark is the recipient of several awards\, including a Kaufman Foundation New Investigator Award (2015) and NSF CAREER Award (2021). \nPlease contact a.ramsey@northeastern.edu for the zoom link to attend remotely.
URL:https://coe.northeastern.edu/event/open-shell-molecules-a-radical-design-for-organic-optoelectronic-materials/
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