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Title: In situ spectroscopic characterization of a solution-phase X-type ligand exchange at colloidal lead sulphide quantum dot surfaces

Here, we employed quantitative NMR spectroscopy and spectrophotometric absorbance titration to study a quantum dot X-type ligand exchange reaction. We find that the exchange is highly cooperative, where at low extents of exchange the change in free energy of the reaction, Δ G XC, is ~11 kJ mol –1 while at higher extents of exchange Δ G XC saturates to ~–4 kJ mol –1. A modified Fowler binding isotherm is developed to describe the reaction.
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [2]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Report Number(s):
NREL/JA-5900-67253
Journal ID: ISSN 1359-7345; CHCOFS
Grant/Contract Number:
AC36-08GO28308
Type:
Accepted Manuscript
Journal Name:
ChemComm
Additional Journal Information:
Journal Volume: 52; Journal Issue: 96; Journal ID: ISSN 1359-7345
Publisher:
Royal Society of Chemistry
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; QD surface chemistry; PbS QDs; ligand exchange
OSTI Identifier:
1334589

Kroupa, Daniel M., Anderson, Nicholas C., Castaneda, Chloe V., Nozik, Arthur J., and Beard, Matt C.. In situ spectroscopic characterization of a solution-phase X-type ligand exchange at colloidal lead sulphide quantum dot surfaces. United States: N. p., Web. doi:10.1039/C6CC08114B.
Kroupa, Daniel M., Anderson, Nicholas C., Castaneda, Chloe V., Nozik, Arthur J., & Beard, Matt C.. In situ spectroscopic characterization of a solution-phase X-type ligand exchange at colloidal lead sulphide quantum dot surfaces. United States. doi:10.1039/C6CC08114B.
Kroupa, Daniel M., Anderson, Nicholas C., Castaneda, Chloe V., Nozik, Arthur J., and Beard, Matt C.. 2016. "In situ spectroscopic characterization of a solution-phase X-type ligand exchange at colloidal lead sulphide quantum dot surfaces". United States. doi:10.1039/C6CC08114B. https://www.osti.gov/servlets/purl/1334589.
@article{osti_1334589,
title = {In situ spectroscopic characterization of a solution-phase X-type ligand exchange at colloidal lead sulphide quantum dot surfaces},
author = {Kroupa, Daniel M. and Anderson, Nicholas C. and Castaneda, Chloe V. and Nozik, Arthur J. and Beard, Matt C.},
abstractNote = {Here, we employed quantitative NMR spectroscopy and spectrophotometric absorbance titration to study a quantum dot X-type ligand exchange reaction. We find that the exchange is highly cooperative, where at low extents of exchange the change in free energy of the reaction, ΔGXC, is ~11 kJ mol–1 while at higher extents of exchange ΔGXC saturates to ~–4 kJ mol–1. A modified Fowler binding isotherm is developed to describe the reaction.},
doi = {10.1039/C6CC08114B},
journal = {ChemComm},
number = 96,
volume = 52,
place = {United States},
year = {2016},
month = {11}
}