Water-proton relaxivity of hyperbranched polymers carrying TEMPO radicals

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

研究成果: Contribution to journalArticle査読

13 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)201-204
ページ数4
ジャーナルMagnetic Resonance in Chemistry
47
3
DOI
出版ステータス出版済み - 3 1 2009

All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 材料科学(全般)

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