Synthesis and characterization of amphiphilic phenylene ethynylene oligomers and their Langmuir-Blodgett films.
Langmuir
; 22(21): 8813-20, 2006 Oct 10.
Article
em En
| MEDLINE
| ID: mdl-17014122
ABSTRACT
We report the synthesis of a series of amphiphilic molecular building blocks that can be self-assembled at the air-water interface to form two- and three-dimensional nanostructures with tunable optoelectronic properties. Compression of these molecular building blocks using the Langmuir-Blodgett method gives rise to monolayer and multilayer thin films with different packing densities and electronic properties that are tunable due to varying pi-pi (hydrophobic) interactions. Depending on the noncovalent interaction between chromophores, we observe a transition toward denser packing with increasing number of phenylene ethynylene repeat units. Additionally, we use quantum-chemical simulations to help determine the excited-state electronic structure, intermolecular interactions, and packing trends. Our results demonstrate that the interplay between dipole-dipole and pi-pi interactions dominates the formation of thin films with various packing densities and determines the associated optical properties.
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2006
Tipo de documento:
Article