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Monomeric and dimeric amidinate complexes of magnesium.
A R Sadique1, M J Heeg, C H Winter
1Department of Chemistry, Wayne State University, Detroit, MI 48202, USA.
Inorganic Chemistry
|November 27, 2001
Summary
New magnesium amidinato complexes were synthesized and characterized. These novel compounds show potential for chemical vapor deposition of magnesium-doped semiconductor films.
Area of Science:
- Organometallic Chemistry
- Materials Science
- Inorganic Chemistry
Background:
- Amidinato ligands are versatile ligands in organometallic chemistry.
- Magnesium complexes are of interest for their potential applications in catalysis and materials science.
Purpose of the Study:
- To synthesize and characterize novel magnesium amidinato complexes.
- To investigate the structural and thermodynamic properties of these complexes.
- To explore their potential application in chemical vapor deposition (CVD).
Main Methods:
- Reaction of anhydrous magnesium bromide with various lithium amidinate precursors.
- Characterization using spectral (NMR, IR) and analytical data.
- Single-crystal X-ray crystallography for structural determination.
- Thermodynamic analysis of monomer-dimer equilibrium using van't Hoff plots.
Main Results:
- Synthesis of four new magnesium bis(amidinato) complexes with high yields.
- Structural elucidation of three complexes, revealing unique ligand coordination modes (e.g., mu,eta(2):eta(1)-amidinato).
- Observation of a monomer-dimer equilibrium for one complex in solution, with detailed thermodynamic parameters determined.
- Discussion of potential applications in CVD for magnesium-doped Group 13 semiconductors.
Conclusions:
- Novel magnesium amidinato complexes can be efficiently synthesized.
- These complexes exhibit diverse structural features and solution behavior.
- The compounds hold promise as precursors for the CVD of functional semiconductor materials.