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SUMMARY:Metal-Mediated Ring Fusions in Scalable Syntheses of Conjugated Nan
 ocarbons
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20241025T160000
UID:2026-04-16-10-40-20@natsci.colostate.edu
DTSTAMP:20260416T104020
Description:About the Seminar: \n\nGraphene and its properties have motiva
 ted research on large polycyclic aromatic hydrocarbons (PAHs)\, which are 
 basic building blocks of graphene and other carbon-rich nanostructures. Va
 rious PAHs are of interest as molecular models\, synthetic precursors\, an
 d components in electronic  devices\, due to unique properties that resul
 t from their extended conjugation and rigidity. A central goal in this are
 a is the synthetic manipulation of electronic properties for nanocarbon ma
 terials\, by generation of well-defined dimensionalities and functionaliza
 tions. We have employed selective metal-mediated cycloadditions for extens
 ion of π systems and introduction of multiple fused rings in the synthesi
 s of π-conjugated oligomers\,  polymers\, and macrocycles\, mainly via 
 the reductive coupling of alkynes with a low-valent zirconocene reagent. I
 n addition to the zirconocene coupling of alkynes\, high-yielding and chem
 oselective [2+2+2] cycloadditions of alkynes (with an iridium catalyst) an
 d/or [2+2+n] cycloadditions of nitriles (with titanocene) have been develo
 ped as complimentary synthetic tools for access to and elaboration of nano
 carbon structures. An additional aspect to zirconocene alkyne coupling che
 mistry involves reversible processes that allow \"Dynamic Covalent Chemist
 ry\" assembly of large structures including macrocycles and cages.\n\nAbou
 t the Speaker:\n\nT. Don Tilley is the PMP Tech Chancellor\\'s Chair in Ch
 emistry in the College of Chemistry at UC Berkeley\, and is a Faculty Seni
 or Scientist in the Catalysis Program at the Lawrence Berkeley National La
 boratory (LBNL). He received his BS degree in Chemistry from UT Austin\, a
 nd a PhD from Berkeley working with Richard Andersen on organolanthanide c
 hemistry. His postdoctoral studies were conducted in the labs of Bob Grubb
 s and John Bercaw at Caltech\, and Luigi Venanzi and Piero Pino at ETH Zü
 rich\, in a US-Swiss exchange program. In 1983 he began his independent ca
 reer at the University of California\, San Diego\, where he was eventually
  promoted to Professor in 1990\, and then in 1994 he accepted appointments
  at UC Berkeley and LBNL. He is a fellow of the American Chemical Society\
 , the American Association for the Advancement of Science\, the American A
 cademy of Arts and Sciences\, and the NAS. He has received national awards
  from the American Chemical Society for organometallic chemistry\, silicon
  chemistry\, and distinguished service to inorganic chemistry. Internation
 al recognitions have come from Japan (JSPS Fellowship)\, Germany (Humboldt
 \; Wacker Silicon Award)\, France (visiting Professorships)\, and the UK (
 Centenary Medal).\n\nDr. Tilley\\'s research addresses fundamental aspects
  of organometallic chemistry and catalysis. In an important aspect of this
  work\, synthetic and mechanistic transition metal-silicon chemistry is in
 vestigated in pusuit of more efficient and sustainable transformations of 
 silicon compounds\, and the formation of silicon-containing polymers. Addi
 tional research in organic materials chemistry focuses on synthetic routes
  to conducting\, semi-conducting and optically active systems with extende
 d conjugation\, and targets molecular cut-outs of important nanocarbon mat
 erials such as graphene and nanotubes. As a Faculty Senior Scientist at LB
 NL\, he developed a program based on the molecular design and synthesis of
  advanced materials including complex oxides produced from tailored precur
 sor molecules and heterogeneous\, single-site catalysts. Currently\, a maj
 or part of Tilley\\'s research program focuses on solar energy conversion\
 , and molecular\, nanostructured\, and surface-attached catalysts in appli
 cations for solar–fuels technologies. Reactions of interest are water ox
 idation\, hydrogen generation\, and carbon dioxide reduction\, and primary
  activities involve mechanistic studies of multielectron chemical transfor
 mations promoted by multimetallic assemblies. 4:00 pm
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