Volatile and Thermally Stable Polymeric Tin Trifluoroacetates.

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ID: 84349
2020
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Abstract
Tin trifluoroacetates are effective vapor phase single-source precursors for F-doped SnO, but their structures have been poorly understood for decades. Here we undertook a comprehensive structural analysis of these compounds in both the solid and gas phases through a combined single-crystal X-ray crystallography, gas phase electron diffraction, and density functional theory investigation. Tin(II) bis(trifluoroacetate) () thermally decomposes into a 1:1 mixture of and ditin(II) μ-oxybis(μ-trifluoroacetate) () during sublimation, which then polymerize into hexatin(II)-di-μ-oxyoctakis(μ-trifluoroacetate) () upon solidification. Reversible depolymerization occurred readily upon heating, making a useful vapor phase precursor itself. Tin(IV) tetrakis(trifluoroacetate) () was also found to be polymeric in the solid state, but it evaporated as a monomer over 130 °C lower than . This counterintuitive improvement in volatility by polymerization was possibly due to the large entropy change during sublimation, which offers a strategic new design feature for vapor phase deposition precursors.
Reference Key
bai2020volatileinorganic Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Bačić, Goran;Rankine, Conor D;Masuda, Jason D;Wann, Derek A;Barry, Seán T;
Journal Inorganic chemistry
Year 2020
DOI
10.1021/acs.inorgchem.9b01308
URL
Keywords
accelerated ageing clay minerals long-term leachability metal immobilization probability-based approach

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