Water-proton relaxivity of hyperbranched polymers carrying TEMPO radicals

Hiroyuki Hayashi, Satoru Karasawa, Akihiro Tanaka, Keisuke Odoi, Katsumi Chikama, Hideto Kuribayashi, Noboru Koga

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Abstract

High water-soluble hyperbranched poly(styrene) (HPS) polymers carrying stable 2,2,6,6-tetramethylpiperidine-1 -oxyl (TEMPO) radicals, HPS-N-TEMPO, HPS-Im-TEMPO, and HPS-Im-(TEMPO)2, were prepared in ca. 60% introducing yield. HPS-N-TEMPO and HPS-Im-TEMPO were determined to be nearly spherical shapes of the diameter of 2.4 ± 0.6 and 2.2 ± 0.6 nm, respectively, by transmission electron microscope (TEM) images. The values of water-proton relaxivity, r1, at 25 MHz, 0.59 T, and 25°C were 6.0, 5.2, and 14 mM-1 sec-1 for HPS-N-TEMPO, HPS-Im-TEMPO, and HPS-Im-(TEMPO)2, respectively. The spin-lattice relaxation time (T1)-weighted images in phantom were also observed.

Original languageEnglish
Pages (from-to)201-204
Number of pages4
JournalMagnetic Resonance in Chemistry
Volume47
Issue number3
DOIs
Publication statusPublished - Mar 1 2009

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Protons
Polymers
Spin-lattice relaxation
Water
Relaxation time
Styrene
Electron microscopes
TEMPO

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

Hayashi, H., Karasawa, S., Tanaka, A., Odoi, K., Chikama, K., Kuribayashi, H., & Koga, N. (2009). Water-proton relaxivity of hyperbranched polymers carrying TEMPO radicals. Magnetic Resonance in Chemistry, 47(3), 201-204. https://doi.org/10.1002/mrc.2384

Water-proton relaxivity of hyperbranched polymers carrying TEMPO radicals. / Hayashi, Hiroyuki; Karasawa, Satoru; Tanaka, Akihiro; Odoi, Keisuke; Chikama, Katsumi; Kuribayashi, Hideto; Koga, Noboru.

In: Magnetic Resonance in Chemistry, Vol. 47, No. 3, 01.03.2009, p. 201-204.

Research output: Contribution to journalArticle

Hayashi, H, Karasawa, S, Tanaka, A, Odoi, K, Chikama, K, Kuribayashi, H & Koga, N 2009, 'Water-proton relaxivity of hyperbranched polymers carrying TEMPO radicals', Magnetic Resonance in Chemistry, vol. 47, no. 3, pp. 201-204. https://doi.org/10.1002/mrc.2384
Hayashi H, Karasawa S, Tanaka A, Odoi K, Chikama K, Kuribayashi H et al. Water-proton relaxivity of hyperbranched polymers carrying TEMPO radicals. Magnetic Resonance in Chemistry. 2009 Mar 1;47(3):201-204. https://doi.org/10.1002/mrc.2384
Hayashi, Hiroyuki ; Karasawa, Satoru ; Tanaka, Akihiro ; Odoi, Keisuke ; Chikama, Katsumi ; Kuribayashi, Hideto ; Koga, Noboru. / Water-proton relaxivity of hyperbranched polymers carrying TEMPO radicals. In: Magnetic Resonance in Chemistry. 2009 ; Vol. 47, No. 3. pp. 201-204.
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