The synthesis and coordination chemistry of colloidal semiconductor quantum dotsAbstract: I will describe our studies of nanocrystal nucleation and growth and surface coordination chemistry. First, I will present a library of derivatized thiourea and selenourea precursors whose wide range of reactivity adjusts the metal chalcogenide formation kinetics. Using this library we observe a well-defined relationship between solute supply and the concentration of nanocrystals allowing a desired nanocrystal size to be obtained in quantitative yield. Second, I will describe the important relationship between nanocrystal coordination chemistry and electronic structure. Using liquid NMR spectroscopy we have discovered a novel ligand exchange mechanism where the surface layer of excess metal cations on metal chalcogenide nanocrystals is displaced in the presence of neutral donor ligands. The importance of this behavior to luminescence quantum yield and nanocrystal synthesis will be discussed.

Tuesday, April 26, 2016Cram Conference Room, 3440 Mol Sci

3:30 pm Please contact imai@chem.ucla.edu (x54208) for additional information. For an updated listing of UCLA Chemistry and Biochemistry seminars, please visit: http://www.chemistry.ucla.edu/seminars

SPECIAL INORGANIC CHEMISTRY SEMINAR

Professor Jonathan S. Owen Department of Chemistry

Columbia University