β‐Cyclodextrin Pseudopolyrotaxanes with π‐Conjugated Polymer Axles

Abstract

Summary: β‐Cyclodextrin (β‐CD) pseudopolyrotaxanes containing poly(thiophene‐2,5‐diyl), PTh, or poly(3‐methylthiophene‐2,5‐diyl)s, P3MeThs, as an axle were prepared. Structures of the pseudopolyrotaxanes and their inclusion behavior with β‐CD were investigated. The UV‐vis measurements revealed that inclusion of P3MeThs by β‐CD depended on the flexibility of the main chain and their molecular weight.Formation of the inclusion complex of β‐CD and PTh.imageFormation of the inclusion complex of β‐CD and PTh.

Electrically insulated molecular wires

“…Conducting pseudorotaxanes were also obtained by including polythiophene or poly(3-methyl)thiophene in the cavity of β-CD [45].…”

Polyrotaxanes

“…Tables 6 and 7 summarize previous reports about polypseudorotaxanes with π-conjugated polymers (oligomers) such as poly(p-phenylene) (69-71), poly(fluorene) (71), poly(4,4 -diphenylenevinylene) (71), poly(phenylenevinylene) (72,73), polythiophene (PT) (74)(75)(76)(77)(78)(79), and polyaniline (80)(81)(82)(83)(84)(85)(86)(87). The inclusion complex between Hydroxypropyl (HP)-β-CD and 2thiophene (2T) gives polypseudorotaxane with PT, which can be prepared by electropolymerization in aqueous solutions (77).…”

“…Stirring the reaction mixture for a prolonged period causes further threading of β-CD onto the water-soluble polypseudorotaxanes to give water-insoluble polypseudorotaxanes. UV-vis measurements reveal that the inclusion of poly(3-methylthiophene-2,5-diyl)s by β-CD depends on the flexibility of the main chain and the molecular weight (78).…”

Isolierte molekulare Drähte

“…Yamaguchi und Mitarbeiter haben gezeigt, dass Polythiophen mit wässrigen b-CD-Lösungen langsam Einschlusskomplexe bildet. [82] Ein wasserlösliches Pseudopolyrotaxan entsteht nach dreiwöchigem Rühren von Polythiophen mit b-CD in Wasser. Beim Auffädeln weiterer Cyclodextrine fällt ein Pseudopolyrotaxan mit nur etwa 0.1 Abbildung 10.…”