Metal to metal multiple bonds in ordered assemblies
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Contributed by Malcolm H. Chisholm, December 5, 2006 (received for review October 20, 2006)
Abstract
The synthesis and properties of metal–metal (MM) quadruply bonded compounds of molybdenum and tungsten in liquid crystalline phases are described. Covalently linked MM quadruply bonded complexes, dimers of dimers, are shown to give rise to mixed valence complexes upon oxidation and the degree of electron delocalization is shown to be correlated with the M2δ bridge π interactions. Class III behavior or complete delocalization is observed to M2 to M2 distances of up to 14 Å. When the M2 unit is attached to oligothiophenes via a carboxylate tether, the photophysical properties of the thienyl units are greatly modified due to M2δ–thienyl π conjugation and spin–orbit coupling. This leads to long-lived emissive states and electroluminescence in solid-state devices.
Footnotes
- †E-mail: chisholm{at}chemistry.ohio-state.edu
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This contribution is part of the special series of Inaugural Articles by members of the National Academy of Sciences elected on May 3, 2005.
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Author contributions: M.H.C. designed research and wrote the paper.
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The author declares no conflict of interest.
- Abbreviation:
- MM,
- metal–metal.
- © 2007 by The National Academy of Sciences of the USA
