BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//ZContent.net//ZapCalLib 1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
SUMMARY:Nucleation Kinetics and Molecular Mechanism of {[(1,5-COD)IrI•HPO
 4]2}2– as a Bimetallic Precursor to Ir(0)~125 Nanoparticles
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20192201T000000
UID:2026-05-17-08-21-02@natsci.colostate.edu
DTSTAMP:20260517T082102
Description:Research Seminar Abstract\n\nThe kinetics and molecular mechani
 sm of nucleation are investigated in molecular detail starting from [(1\,5
 -COD)IrI(NCCH3)2][BF4]\, 1\, which upon addition of HPO42– to 1 forms a 
 neutral\, phosphate-bridged species\, {[(1\,5-COD)IrI(NCCH3)]2•HPO4}0\, 
 2\, en route to {[(1\,5-COD)IrI•HPO4]2[Bu4N]2}\, 3. 1H NMR solution spec
 iation and Signer apparatus solution molecular weight studies establish th
 at in situ prepared {[(1\,5-COD)IrI•HPO4]2}2–\, 3\, exists predominant
 ly in its indicated\, dimeric form. The NMR studies also identify {[(1\,5-
 COD)IrI(NCCH3)]2•HPO4}0\, 2\, as an important\, meta-stable species with
  one less HPO42–\, formed in a dissociative equilibrium of 3 to 2 plus H
 PO42–. Kinetic studies reveal a first-order dependence of nucleation on 
 the concentration of 3\, and\, hence\, rule out the higher-order dependenc
 e implied by Classical Nucleation Theory. Additional kinetic studies revea
 l a telling\, inverse\, quadratic dependence on added HPO42–\, results t
 hat unveil the previously unavailable insights that a simple bimetallic\, 
 Ir2 precursor is sufficient to enable low molecularity nucleation via {[(1
 \,5-COD)IrI(NCCH3)]2•HPO4}0\, 2\, as a kinetically competent intermediat
 e—a unique example of a nucleation mechanism in molecular detail from a 
 precisely defined molecular precursor that also includes spectroscopic det
 ection of a kinetically competent intermediate. The state-of-the-art nucle
 ation results presented provide insights that promise to help the drive to
 wards a deeper understanding of nucleation not just in transition-metal na
 noparticle formation\, but hopefully more broadly across nature. 4:00 pm
END:VEVENT
END:VCALENDAR