title: The Magic-Size Nanocluster (CdSe)34as a Low-Temperature Nucleant for Cadmium Selenide Nanocrystals; Room-Temperature Growth of Crystalline Quantum Platelets.
abstract: Reaction of Cd(OAc)2·2H2O and selenourea in primary-amine/secondary-amine cosolvent mixtures affords crystalline CdSe quantum platelets at room temperature. Their crystallinity is established by X-ray diffraction analysis (XRD), high-resolution transmission electron microscopy (TEM), and their sharp extinction and photoluminescence spectra. Reaction monitoring establishes the magic-size nanocluster (CdSe)34to be a key intermediate in the growth process, which converts to CdSe quantum platelets by first-order kinetics with no induction period. The results are interpreted to indicate that the critical crystal-nucleus size for CdSe under these conditions is in the range of (CdSe)34to (CdSe)68. The nanocluster is obtained in isolated form as [(CdSe)34(n-octylamine)16(di-n-pentylamine)2], which is proposed to function as crystal nuclei that may be stored in a bottle.
authors.affiliation: Department of Chemistry, Washington University , St. Louis, Missouri 63130-4899, United States.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Washington University , St. Louis, Missouri 63130-4899, United States.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Washington University , St. Louis, Missouri 63130-4899, United States.
authors.forename: Fudong
authors.initials: F
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Washington University , St. Louis, Missouri 63130-4899, United States.
authors.forename: Daryl E
authors.initials: DE
authors.lastname: Giblin
authors.affiliation: Department of Chemistry, Washington University , St. Louis, Missouri 63130-4899, United States.
authors.forename: Jessica
authors.initials: J
authors.lastname: Hoy
authors.affiliation: Department of Chemistry, Washington University , St. Louis, Missouri 63130-4899, United States.
authors.forename: Henry W
authors.initials: HW
authors.lastname: Rohrs
authors.affiliation: Department of Chemistry, Washington University , St. Louis, Missouri 63130-4899, United States.
authors.forename: Richard A
authors.initials: RA
authors.lastname: Loomis
authors.affiliation: Department of Chemistry, Washington University , St. Louis, Missouri 63130-4899, United States.
authors.forename: William E
authors.initials: WE
authors.lastname: Buhro