From Static to Dynamic: Electron Density of HOMO at Biaryl Linkage Controls the Mechanism of Hole Delocalization.
J Am Chem Soc
; 140(14): 4765-4769, 2018 04 11.
Article
en En
| MEDLINE
| ID: mdl-29595254
ABSTRACT
In order to extend the physical length of hole delocalization in a molecular wire, chromophores of increasing size are often desired. However, the effect of size on the efficacy and mechanism of hole delocalization remains elusive. Here, we employ a model set of biaryls to show that with increasing chromophore size, the mechanism of steady-state hole distribution switches from static delocalization in biaryls with smaller chromophores to dynamic hopping, as exemplified in the largest system, tBuHBC2 (i.e., "superbiphenyl"), which displays a vanishingly small electronic coupling. This important finding is analyzed with the aid of Hückel molecular orbital and Marcus-Hush theories. Our findings will enable the rational design of the novel molecular wires with length-invariant redox/optical properties suitable for long-range charge transfer.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Teoría Cuántica
/
Compuestos de Bifenilo
/
Electrones
Tipo de estudio:
Prognostic_studies
Idioma:
En
Año:
2018
Tipo del documento:
Article