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Synthesis and Volatility Characterization of Mo(II) and W(II) Compounds for Thin Films.
Da-Ae Park1, Ji Young Son1,2, Ji Min Seo1,3
1Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT),Daejeon 34114, Republic of Korea.
Inorganic Chemistry
|October 3, 2023
Summary
New molybdenum and tungsten compounds were synthesized and characterized for their volatility and thermal stability. The tungsten compound demonstrated excellent durability over five weeks, indicating potential applications in materials science.
Area of Science:
- Organometallic Chemistry
- Materials Science
Background:
- Molybdenum (Mo) and Tungsten (W) compounds are crucial in various catalytic and material applications.
- Understanding the thermal properties of these metal complexes is essential for their practical use.
Purpose of the Study:
- To synthesize and characterize novel Mo(II) and W(II) allyl compounds.
- To investigate the thermal stability, volatility, and sublimation properties of these synthesized compounds.
Main Methods:
- Synthesis of four Mo(II) and W(II) complexes with allyl and diamine ligands.
- Characterization using techniques including structural analysis and thermogravimetric analysis (TGA).
- Determination of sublimation temperatures, vapor pressures, and enthalpies of vaporization.
Main Results:
- Compounds Mo(η³-allyl)(CO)₂(Tri-MEDA)Br (1) and W(η³-allyl)(CO)₂(Tri-MEDA)Br (3) exhibited pseudo-octahedral geometries.
- TGA revealed high residue percentages for (1) and (3), suggesting thermal stability.
- Both compounds (1) and (3) were found to be volatile, with specific sublimation points and enthalpies of vaporization determined.
- The tungsten compound (3) showed remarkable durability for 5 weeks under thermal stress at 120 °C.
Conclusions:
- The synthesized Mo(II) and W(II) compounds possess favorable volatility and thermal stability.
- The tungsten compound (3) demonstrates significant potential for applications requiring high thermal durability.
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