Thorium amidates function as single-source molecular precursors for thorium dioxide

We report the synthesis of four homoleptic thorium( iv ) amidate complexes as single-source molecular precursors for thorium dioxide. Each can be sublimed at atmospheric pressure, with the substituents on the amidate ligands significantly impacting their volatility and thermal stability. These compl...

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Bibliographic Details
Published in:Chemical communications (Cambridge, England) England), 2021-05, Vol.57 (4), p.4954-4957
Main Authors: Straub, Mark D, Ouellette, Erik T, Boreen, Michael A, Branson, Jacob A, Ditter, Alex, Kilcoyne, A. L. David, Lohrey, Trevor D, Marcus, Matthew A, Paley, Maria, Ramirez, José, Shuh, David K, Minasian, Stefan G, Arnold, John
Format: Article
Language:English
Subjects:
Crystallography
Dioxides
Precursors
Pyrolysis
Thermal stability
Thorium
Thorium dioxide
Thorium oxides
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Summary:We report the synthesis of four homoleptic thorium( iv ) amidate complexes as single-source molecular precursors for thorium dioxide. Each can be sublimed at atmospheric pressure, with the substituents on the amidate ligands significantly impacting their volatility and thermal stability. These complexes decompose via alkene elimination to give ThO 2 without need for a secondary oxygen source. ThO 2 samples formed from pyrolysis of C -alkyl amidates were found to have higher purity and crystallinity than ThO 2 samples formed from C -aryl amidates. Volatile thorium amidates can be converted to ThO 2 in the absence of an external oxygen source, and the thermal properties of these precursors can be readily tuned by modifying the ligand substituents.
ISSN:1359-7345
1364-548X
1364-548X
DOI:10.1039/d1cc00867f