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Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
On the structure of β-molybdenum dichloride
Frederic Poineau1, Erik V Johnstone, Philippe F Weck
1Department of Chemistry, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA. poineauf@unlv.nevada.edu
Inorganic Chemistry
|April 14, 2012
Summary
Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy reveals distinct structural differences between technetium(II) chloride (TcCl2) and beta-molybdenum dichloride (β-MoCl2). Calculations indicate β-MoCl2
Area of Science:
- Solid-state chemistry
- Inorganic chemistry
- Materials science
Background:
- Understanding the structural nuances of transition metal halides is crucial for predicting their chemical properties.
- Technetium (Tc) and Molybdenum (Mo) chlorides exhibit diverse structural motifs.
- Previous studies suggest complex cluster formations in these compounds.
Purpose of the Study:
- To elucidate and compare the solid-state structures of TcCl2 and β-MoCl2.
- To investigate the bonding and structural units present in β-MoCl2.
- To assess the relative stability of different β-MoCl2 structural models.
Main Methods:
- Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy was employed to probe local atomic environments.
- First-principles calculations were utilized to model and compare structural stabilities.
Main Results:
- EXAFS analysis provided interatomic distances for Tc-Tc and Mo-Mo atoms in TcCl2 and β-MoCl2, respectively.
- The structure of β-MoCl2 was found to be consistent with [Mo4Cl12] units, comprising doubly bridged [Mo2Cl8] units with triple Mo-Mo bonds.
- Calculations showed that the TcCl2-type structure for β-MoCl2 is less stable than α-MoCl2 or edge-sharing [Mo4Cl12] clusters.
Conclusions:
- β-Molybdenum dichloride possesses a unique structure characterized by [Mo4Cl12] units, distinct from the TcCl2 structure type.
- The bonding in β-MoCl2 involves significant Mo-Mo multiple bonding.
- Computational results highlight the energetic preference for other structural arrangements of molybdenum dichloride over the TcCl2-type structure.
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