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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique
Published on: November 28, 2016
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Alkyltin Keggin Clusters Templated by Sodium.
Sumit Saha1,2, Deok-Hie Park1,2, Danielle C Hutchison1,2
1Center for Sustainable Materials Chemistry (CSMC), Oregon State University, USA.
Angewandte Chemie (International Ed. in English)
|June 7, 2017
Summary
Researchers discovered a new neutral tin-oxo cluster topology, β-NaSn13, using n-butyltin compounds. This unique cluster is a model for studying the transformation of clusters into nanopatterns for EUV lithography.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Nanotechnology
Background:
- Dodecameric (Sn12) and hexameric topologies are common in monoalkyltin-oxo cluster chemistry.
- Alkyltin-oxo clusters have shown promise in extreme ultraviolet (EUV) lithography due to their patterning performance.
Purpose of the Study:
- To characterize a new cluster topology crystallized from industrial n-butyltin hydroxyde (n-BuSnOOH).
- To investigate the role of sodium (Na) as a template in alkyltin Keggin cluster formation.
- To establish a neutral cluster model for studying cluster-to-film transformations.
Main Methods:
- Single-crystal X-ray analysis to determine cluster structure.
- Small-angle X-ray scattering (SAXS), Nuclear Magnetic Resonance (NMR), and Electrospray Ionization Mass Spectrometry (ESI MS) for cluster differentiation and characterization.
Main Results:
- Identification and crystallization of a novel β-Keggin cluster, formulated as [NaO4(BuSn)12(OH)3(O)9(OCH3)12(Sn(H2O)2)] (β-NaSn13).
- Demonstration that β-NaSn13 is a neutral cluster, unlike previously studied cationic alkyltin clusters.
- Distinction of β-NaSn13 from other co-existing Sn12 and various clusters in crude n-BuSnOOH, highlighting Na's templating role.
Conclusions:
- The discovery of the neutral β-NaSn13 cluster provides a unique, counterion-free model system.
- This model system is ideal for fundamental studies on the transformation of clusters into thin films and nanopatterns.
- The findings advance the understanding of alkyltin-oxo cluster chemistry and its potential applications in advanced lithography.
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