Journal
PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
Volume 179, Issue 4-5, Pages 673-684Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10426500490426395
Keywords
conductivity; electrochemistry; heterocycle; magnetism; neutral radical; solid state structures; sulfur-nitrogen
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The use of neutral pi-radicals as building blocks for molecular conductors holds both appeal and challenge. Such systems obviate the need for counterions, as charge transfer is not required to generate charge carriers. Essentially an array of pi-radicals should function like atoms in an elemental metal, e.g., sodium, affording a half-filled energy band. Most radicals, however, tend to dimerize, and even when association can be suppressed the resulting low bandwidth W, coupled with a high on-site Coulomb repulsion U, leads to a Mott insulating state. We are pursuing the design and synthesis of stable heterocyclic thiazyl radicals, with a view to generating stable, crystalline materials with a high W/U ratio. The search for these new radicals, the molecular analogues of sodium, is the subject of this presentation.
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