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Supramolecular Assemblies of Polyaniline Through Cooperative Bundling by a Palladium-Complex-Appended Synthetic Cross-Linker

Supramolecular Assemblies of Polyaniline Through Cooperative Bundling by a Palladium-Complex-Appended Synthetic Cross-Linker

Takahiro Kaseyama, Shinji Takebayashi, Rie Wakabayashi, Seiji Shinkai, Kenji Kaneko, Masayuki Takeuchi

Chemistry. 2009 Nov 23;15(46):12627-35.

PMID: 19885895

Abstract:

A synthetic cross-linker (1) bearing two binding sites for imine moieties in polyaniline has been used to organize polyaniline emeraldine base (EB) or polyaniline emeraldine salt (ES) into aligned assemblies. Complex 1 exhibited highly cooperative binding toward mEB (a repeating unit analogue of EB), for which the association constants K(1) and K(2) were evaluated to be 2.2x10(4) and 9.4x10(5) M(-1), respectively. (1)H NMR studies revealed that the diimine moieties in mEB are recognized cooperatively in anti-conformation by 1. The ordered structures organized from 1 and EB or ES were efficiently formed through supramolecular bundling. These ordered assemblies have a periodicity of 2.5 nm that was confirmed by means of transmittance electron microscopy (TEM) and high-resolution TEM (HRTEM). The cooperative binding would be important for the bundling and alignment of the polymers, as evidenced by the fact that neither reference compounds 2 nor 3 were capable of producing similar assemblies. The electric conductivity of the samples was measured and the results were discussed.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP25233301	Polyaniline (emeraldine base)		25233-30-1	Price

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