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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.
Takemoto, Yusa; Yamamoto, Takayuki; Ikuma, Naohiko; Uchida, Yoshiaki; Suzuki, Katsuaki; Shimono, Satoshi; Takahashi, Hiroki; Sato, Nobuhiro; Oba, Yojiro; Inoue, Rintaro; Sugiyama, Masaaki; Tsue, Hirohito; Kato, Tatsuhisa; Yamauchi, Jun; Tamura, Rui.
Affiliation
  • Takemoto Y; Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan. tamura.rui.8c@kyoto-u.ac.jp.
Soft Matter ; 11(27): 5563-70, 2015 Jul 21.
Article in En | MEDLINE | ID: mdl-26073537
An optically active amphiphilic nitroxide radical compound [(S,S,R)-], 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.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Hydrogels / Nitrogen Oxides Language: En Journal: Soft Matter Year: 2015 Document type: Article Affiliation country: Japón Country of publication: Reino Unido

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Hydrogels / Nitrogen Oxides Language: En Journal: Soft Matter Year: 2015 Document type: Article Affiliation country: Japón Country of publication: Reino Unido