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SUMMARY:The Chemistry and Electronic Structure of Some U(II-VI) Amido and I
 mido Complexes
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20192101T000000
UID:2026-04-28-23-33-22@natsci.colostate.edu
DTSTAMP:20260428T233322
Description:About the Seminar\n\nIn this talk\, I will present our work on 
 uranium mono- and bis-imido complexes in various oxidation states and what
  we have learned about the role of covalency in stabilizing the U=N intera
 ction. The synthesis of high oxidation state\, U(V-VI)\, complexes from lo
 wer oxidation state\, U(III-IV) starting materials is driven by the format
 ion and stability of the trans-bis(imido)U(V-VI) functionality. Studies of
  these oxidation reactions show that the lability of the uranium-ligand bo
 nd is extremely important\, making uranium unique. The bis(imido)U(VI) com
 plexes are good starting materials for the synthesis of a unique class of 
 molecules that have diamagnetic ground states\, but low-lying triplet exci
 ted states that give rise to temperature independent paramagnetism (TIP). 
 I will also discuss our very recent syntheses of lower oxidation state\, U
 (II-III)\, amido complexes (1\, 2) that are stabilized by the combination 
 of extremely bulky terphenyl substituents and 6-arene interactions betw
 een the ligand scaffold and the uranium atom. The use of this chelate stra
 tegy to stabilize novel uranium-unsaturated hydrocarbon interactions will 
 also be discussed.\n\n&nbsp\;\n\nAbout that Speaker:\n\nJames M. Boncella 
 received a B.A. in chemistry in 1980 from the College of Wooster\, Wooster
 \, OH\, and a Ph.D. in inorganic chemistry in 1984 from the University of 
 California\, Berkeley. His dissertation work involved the synthesis of org
 anolanthanide complexes under the direction of Prof. R. A. Andersen. Bonce
 lla was a postdoctoral fellow at the University of Oxford with Malcolm L. 
 H. Green from 1984-86 before joining the faculty as an assistant professor
  in the chemistry department at the University of Florida in 1986. While a
 t Florida\, he pursued research in organotransition metal chemistry\, cata
 lysis of polymerization reactions\, and fabrication of LEDs. He moved to L
 os Alamos in 2003 where he became a Technical Staff Member in the Nuclear 
 Materials Technology Division. He is currently the Deputy Group Leader of 
 the Inorganic Isotope and Actinide chemistry group in the Chemistry Divisi
 on of the Laboratory. His research interests encompass the synthesis of un
 usual f-element complexes and the development of transition metal catalyst
 s for the decomposition of formic acid. He has authored over 140 publicati
 ons and patents and was named an ACS Fellow in 2017 and a LANL Fellow in 2
 018. 4:00 pm
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