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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
Published on: December 5, 2015
Uniquely strong electronic communication between [Mo2] units linked by dioxolene dianions.
F Albert Cotton1, Carlos A Murillo, Dino Villagrán
1Department of Chemistry and Laboratory for Molecular Structure and Bonding, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA. cotton@tamu.edu
Strong electronic communication was observed in dimolybdenum compounds linked by dioxolene anions. This interaction facilitates significant charge delocalization in mixed-valence species, confirmed by structural and spectroscopic analyses.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Supramolecular Chemistry
Background:
- Quadruply bonded dimolybdenum (Mo2) units are known for unique electronic properties.
- Dioxolene anions can act as bridging ligands, influencing metal-metal interactions.
- Understanding electronic communication in polynuclear metal complexes is crucial for designing novel materials.
Purpose of the Study:
- To synthesize and characterize novel dimolybdenum compounds featuring dioxolene linkers.
- To investigate the electronic communication and charge delocalization between Mo2 units mediated by dioxolene bridges.
- To explore the impact of linker substituents on the electronic properties of the resulting complexes.
Main Methods:
- Synthesis of neutral and oxidized dimolybdenum complexes.
- X-ray crystallography for structural determination.
- Spectroscopic characterization (UV-vis, NIR, EPR).
- Density Functional Theory (DFT) calculations.
Main Results:
- Successful synthesis of neutral compounds [Mo2(DAniF)3]2(C6X2O4) and singly oxidized products.
- Unusually short Mo-O bond distances indicating strong interaction between Mo2 units and dioxolene linkers.
- Extensive charge delocalization in mixed-valence species, evidenced by large deltaE(1/2) values.
- Spectroscopic and computational data confirm strong electronic coupling.
Conclusions:
- Dioxolene linkers mediate unprecedentedly strong electronic communication between dimolybdenum units.
- The observed charge delocalization is a key feature of these novel supramolecular systems.
- These findings open avenues for designing advanced materials with tunable electronic properties.
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