Characterization of silanol groups in protonated magadiite by 1H and 2H solid-state nuclear magnetic resonance

Yoshihiko Komori, Masaki Miyoshi, Shigenobu Hayashi, Yoshiyuki Sugahara, Kazuyuki Kuroda

研究成果: Article査読

12 被引用数 (Scopus)

抄録

Silanol groups in protonated magadiite (H-magadiite) were characterized by 1H and 2H solid-state nuclear magnetic resonance (NMR). H-magadiite and deuterated (D) magadiite were synthesized by the treatment of Na-rich magadiite with 0.2 N HCl and 0.2 N DCl, respectively. In the 1H NMR spectrum measured at room temperature, silanol groups of H-magadiite showed two signals at 3.75 and 5.70 ppm, indicating that two types of silanol groups were present. The ratio of silanol groups associated with strong hydrogen bonding (5.70 ppm) to those with weaker hydrogen bonding (3.75 ppm) was 2 to 1. The 2H NMR spectra of deuterated magadiite were measured in the temperature range from 150 to 440 K. In the spectra measured at temperatures below 294 K, silanol groups showed Pake doublet patterns. These patterns were composed of two components corresponding to the two types of silanol groups shown in the 1H NMR analysis. Both silanol groups produced wobbling motions with increasing temperature. Above 294 K, the profile of the Pake doublet pattern was transformed gradually to a near triangular pattern, indicating that the silanol groups underwent other motions also, such as a two-site jump.

本文言語English
ページ(範囲)632-637
ページ数6
ジャーナルClays and Clay Minerals
48
6
DOI
出版ステータスPublished - 2000

ASJC Scopus subject areas

  • 水の科学と技術
  • 土壌科学
  • 地球化学および岩石学
  • 地球惑星科学(その他)

フィンガープリント

「Characterization of silanol groups in protonated magadiite by 1H and 2H solid-state nuclear magnetic resonance」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル