Spin-crossover physical gels

A quick thermoreversible response assisted by dynamic self-organization

Tsuyohiko Fujigaya, Dong Lin Jiang, Takuzo Aida

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

Iron(II) triazolate coordination polymers with lipophilic sulfonate counterions with alkyl chains of different lengths have been synthesized. In hydrocarbon solvents, these polymers formed a physical gel and showed a thermoreversible spin transition upon the sol-gel phase transition. The formation of a hydrogen-bonding network between the triazolate moieties and sulfonate ions, bridged by water molecules, was found to play an important role in the spin-crossover event. The spin-transition temperature was tuned over a wide range by adding a small amount of 1-octanol, a scavenger for hydrogen-bonding interactions. This additive was essential for the iron(II) species to adopt a low-spin state. Compared with nongelling references in aromatic solvents, the spin-crossover physical gels are characterized by their quick thermal response, which is due to a rapid restoration of the hydrogen-bonding network, possibly because of a dynamic structural ordering through an enhanced lipophilic interaction of the self-assembling components in hydrocarbon solvents.

Original languageEnglish
Pages (from-to)106-113
Number of pages8
JournalChemistry - An Asian Journal
Volume2
Issue number1
DOIs
Publication statusPublished - Jan 24 2007
Externally publishedYes

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Hydrogen Bonding
Hydrogen bonds
Gels
Hydrocarbons
Polymers
Iron
1-Octanol
Transition Temperature
Phase Transition
Structural dynamics
Restoration
Sol-gels
Hot Temperature
Phase transitions
Ions
Molecules
Water

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Spin-crossover physical gels : A quick thermoreversible response assisted by dynamic self-organization. / Fujigaya, Tsuyohiko; Jiang, Dong Lin; Aida, Takuzo.

In: Chemistry - An Asian Journal, Vol. 2, No. 1, 24.01.2007, p. 106-113.

Research output: Contribution to journalArticle

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