2007年11月
High-pressure delta-AI(OH)(3) and delta-A1OOH phases and isostructural hydroxides/oxyhydroxides: New structural insights from high-resolution H-1 and Al-27 NMR
JOURNAL OF PHYSICAL CHEMISTRY B
- ,
- 巻
- 111
- 号
- 46
- 開始ページ
- 13156
- 終了ページ
- 13166
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1021/jp073968r
- 出版者・発行元
- AMER CHEMICAL SOC
In order to shed light on the proton distributions and order/disorder in high-pressure delta-Al(OH)(3) and delta-AlOOH phases, two-dimensional, high-resolution H-1 CRAMPS (FSLG)-MAS NMR and Al-27 3QMAS NMR spectra have been obtained. For delta-Al(OH)(3), the H-1 CRAMPS-MAS NMR revealed two peaks with an intensity ratio close to 2:1. The Al-27 MAS and 3QMAS NMR suggest a single Al site with a well-defined local structure. For delta-AlOOH, the H-1 and Al-27 NMR indicate the presence of a single H and Al site each. These results are consistent with crystal structures refined from X-ray diffraction. For comparison, 1H MAS and CRAMPS-MAS NMR spectra were also obtained for several other hydroxides/oxyhydroxides, including In(OH)(3) and InOOH that have similar structures to delta-Al(OH)(3) and delta-AlOOH, respectively. These data not only provide additional insights into the proton distributions in these important crystal structure classes but also together provide a better defined quantitative correlation between 1H chemical shift and hydrogen-bonding O center dot center dot center dot O distance.
- リンク情報
- ID情報
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- DOI : 10.1021/jp073968r
- ISSN : 1520-6106
- eISSN : 1520-5207
- Web of Science ID : WOS:000250967900004