Synthesis and characterization of amphiphilic phenylene ethynylene oligomers and their Langmuir-Blodgett films

Zhexiong Tang, Raea K. Hicks, Rudolph J. Magyar, Sergei Tretiak, Yuan Gao, Hsing Lin Wang

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

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 π-π (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 π-π interactions dominates the formation of thin films with various packing densities and determines the associated optical properties.

Original languageEnglish
Pages (from-to)8813-8820
Number of pages8
JournalLangmuir
Volume22
Issue number21
DOIs
Publication statusPublished - 10 Oct 2006
Externally publishedYes

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