Metal to metal multiple bonds in ordered assemblies.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 17299047.
- Also identified by PMC identifier 1815223.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
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 M(2)delta bridge pi interactions. Class III behavior or complete delocalization is observed to M(2) to M(2) distances of up to 14 A. When the M(2) unit is attached to oligothiophenes via a carboxylate tether, the photophysical properties of the thienyl units are greatly modified due to M(2)delta-thienyl pi conjugation and spin-orbit coupling. This leads to long-lived emissive states and electroluminescence in solid-state devices.