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Water‐proton relaxivity of hyperbranched polymers carrying TEMPO radicals by Hiroyuki Hayashi; Satoru Karasawa; Akihiro Tanaka; Keisuke Odoi; Katsumi Chikama; Hideto Kuribayashi; Noboru Koga is a Chemistry article available to read on EtoBox.
What is Water‐proton relaxivity of hyperbranched polymers carrying TEMPO radicals about?
## 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, __r__~1~, 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 (__T__~1~)‐weighted images in phantom were also observed. Copyright © 2009 John Wiley & Sons, Ltd.
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- Author
- Hiroyuki Hayashi; Satoru Karasawa; Akihiro Tanaka; Keisuke Odoi; Katsumi Chikama; Hideto Kuribayashi; Noboru Koga
- Publisher
- John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; John Wiley and Sons Ltd; Wiley (ISSN 0749-1581)
- Published
- 2009
- Language
- EN
- Field
- Chemistry (Physical Sciences)