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Issue 27, 2015
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Preparation, characterization and magnetic behavior of a spin-labelled physical hydrogel containing a chiral cyclic nitroxide radical unit fixed inside the gelator molecule

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Abstract

An optically active amphiphilic nitroxide radical compound [(S,S,R)-5a], which contains a paramagnetic (2S,5S)-2,5-dimethyl-2,5-diphenylpyrrolidine-N-oxyl radical group fixed in the inner position together with a hydrophobic long alkyl chain and a hydrophilic (R)-alanine residue in the opposite terminal positions, was found to serve as a low-molecular-weight gelator in H2O to give rise to a spin-labelled physical hydrogel. Characterization of the hydrogel was performed by microscopic (SEM, TEM and AFM) techniques, XRD and SAXS measurements, and IR, UV and CD spectroscopies. The gel–sol transition temperature was determined by EPR spectral line-width (ΔHpp) analysis. Measurement of the temperature dependence of relative paramagnetic susceptibility (χrel) for the hydrogel and sol phases was achieved by means of the double-integration of VT-EPR spectra.

Graphical abstract: Preparation, characterization and magnetic behavior of a spin-labelled physical hydrogel containing a chiral cyclic nitroxide radical unit fixed inside the gelator molecule

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Publication details

The article was received on 20 May 2015, accepted on 04 Jun 2015 and first published on 05 Jun 2015


Article type: Paper
DOI: 10.1039/C5SM01216C
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Citation: Soft Matter, 2015,11, 5563-5570
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    Preparation, characterization and magnetic behavior of a spin-labelled physical hydrogel containing a chiral cyclic nitroxide radical unit fixed inside the gelator molecule

    Y. Takemoto, T. Yamamoto, N. Ikuma, Y. Uchida, K. Suzuki, S. Shimono, H. Takahashi, N. Sato, Y. Oba, R. Inoue, M. Sugiyama, H. Tsue, T. Kato, J. Yamauchi and R. Tamura, Soft Matter, 2015, 11, 5563
    DOI: 10.1039/C5SM01216C

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