Journal of the American Chemical Society, volume 137, issue 5, pages 1862-1874

Atomistic Description of Thiostannate-Capped CdSe Nanocrystals: Retention of Four-Coordinate SnS4 Motif and Preservation of Cd-Rich Stoichiometry

Loredana Protesescu 1, 2
Maarten Nachtegaal 3
Olga Borovinskaya 1
Lyndon Emsley 5
D. Günther 1
Edward H Sargent 4
4
 
Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario M5S 3G4, Canada
5
 
Centre de RMN à Trés Hauts Champs, Institut de Sciences Analytiques (CNRS/ENS Lyon/UCB Lyon 1), Université de Lyon, 69100 Villeurbanne, France
Publication typeJournal Article
Publication date2015-01-29
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor15
ISSN00027863, 15205126
General Chemistry
Catalysis
Biochemistry
Colloid and Surface Chemistry
Abstract
Colloidal semiconductor nanocrystals (NCs) are widely studied as building blocks for novel solid-state materials. Inorganic surface functionalization, used to displace native organic capping ligands from NC surfaces, has been a major enabler of electronic solid-state devices based on colloidal NCs. At the same time, very little is known about the atomistic details of the organic-to-inorganic ligand exchange and binding motifs at the NC surface, severely limiting further progress in designing all-inorganic NCs and NC solids. Taking thiostannates (K4SnS4, K4Sn2S6, K6Sn2S7) as typical examples of chalcogenidometallate ligands and oleate-capped CdSe NCs as a model NC system, in this study we address these questions through the combined application of solution (1)H NMR spectroscopy, solution and solid-state (119)Sn NMR spectroscopy, far-infrared and X-ray absorption spectroscopies, elemental analysis, and by DFT modeling. We show that through the X-type oleate-to-thiostannate ligand exchange, CdSe NCs retain their Cd-rich stoichiometry, with a stoichiometric CdSe core and surface Cd adatoms serving as binding sites for terminal S atoms of the thiostannates ligands, leading to all-inorganic (CdSe)core[Cdm(Sn2S7)yK(6y-2m)]shell (taking Sn2S7(6-) ligand as an example). Thiostannates SnS4(4-) and Sn2S7(6-) retain (distorted) tetrahedral SnS4 geometry upon binding to NC surface. At the same time, experiments and simulations point to lower stability of Sn2S6(4-) (and SnS3(2-)) in most solvents and its lower adaptability to the NC surface caused by rigid Sn2S2 rings.

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Protesescu L. et al. Atomistic Description of Thiostannate-Capped CdSe Nanocrystals: Retention of Four-Coordinate SnS4 Motif and Preservation of Cd-Rich Stoichiometry // Journal of the American Chemical Society. 2015. Vol. 137. No. 5. pp. 1862-1874.
GOST all authors (up to 50) Copy
Protesescu L., Nachtegaal M., Voznyy O., Borovinskaya O., Rossini A. J., Emsley L., Copéret C., Günther D., Sargent E. H., Kovalenko M. V. Atomistic Description of Thiostannate-Capped CdSe Nanocrystals: Retention of Four-Coordinate SnS4 Motif and Preservation of Cd-Rich Stoichiometry // Journal of the American Chemical Society. 2015. Vol. 137. No. 5. pp. 1862-1874.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1021/ja510862c
UR - https://doi.org/10.1021/ja510862c
TI - Atomistic Description of Thiostannate-Capped CdSe Nanocrystals: Retention of Four-Coordinate SnS4 Motif and Preservation of Cd-Rich Stoichiometry
T2 - Journal of the American Chemical Society
AU - Borovinskaya, Olga
AU - Protesescu, Loredana
AU - Nachtegaal, Maarten
AU - Voznyy, Oleksandr
AU - Rossini, Aaron J.
AU - Emsley, Lyndon
AU - Copéret, Christophe
AU - Günther, D.
AU - Sargent, Edward H
AU - Kovalenko, Maksym V.
PY - 2015
DA - 2015/01/29 00:00:00
PB - American Chemical Society (ACS)
SP - 1862-1874
IS - 5
VL - 137
SN - 0002-7863
SN - 1520-5126
ER -
BibTex |
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BibTex Copy
@article{2015_Protesescu,
author = {Olga Borovinskaya and Loredana Protesescu and Maarten Nachtegaal and Oleksandr Voznyy and Aaron J. Rossini and Lyndon Emsley and Christophe Copéret and D. Günther and Edward H Sargent and Maksym V. Kovalenko},
title = {Atomistic Description of Thiostannate-Capped CdSe Nanocrystals: Retention of Four-Coordinate SnS4 Motif and Preservation of Cd-Rich Stoichiometry},
journal = {Journal of the American Chemical Society},
year = {2015},
volume = {137},
publisher = {American Chemical Society (ACS)},
month = {jan},
url = {https://doi.org/10.1021/ja510862c},
number = {5},
pages = {1862--1874},
doi = {10.1021/ja510862c}
}
MLA
Cite this
MLA Copy
Protesescu, Loredana, et al. “Atomistic Description of Thiostannate-Capped CdSe Nanocrystals: Retention of Four-Coordinate SnS4 Motif and Preservation of Cd-Rich Stoichiometry.” Journal of the American Chemical Society, vol. 137, no. 5, Jan. 2015, pp. 1862-1874. https://doi.org/10.1021/ja510862c.
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