固态209Bi NMR的应用,用于对含有斯木的材料进行结构性特征
Hiyam Hamaed1, Michael W Laschuk, Victor V Terskikh
1Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4.
Journal of the American Chemical Society
|May 26, 2009
概括
这项研究引入了对斯木-209 (209Bi) 的超宽线固态NMR (SSNMR),使斯木材料的详细表征成为可能. 高磁场显著改善了光谱采集和分析,揭示了结构洞察力.
科学领域:
- 固态NMR光谱学 固态NMR光谱学
- 材料的表征材料的表征.
- 无机化学 无机化学 无机化学
背景情况:
- 毕苏-209 (209Bi) 固态核磁共振 (SSNMR) 具有挑战性,因为它具有广泛的光谱图案.
- 了解石环境需要先进的光谱技术.
研究的目的:
- 报告第一个详细研究 (209) Bi SSNMR用于广泛的中央过渡粉末模式.
- 为了研究超宽线SSNMR的实用性,以表征各种含有石的材料.
- 使用计算方法将NMR参数与分子结构相关联.
主要方法:
- 在9.4T和21.1T采用频率分级技术获取 (209) Bi超宽线SSNMR光谱.
- 分析模拟以提取四极合常量 (CQ) 和化学转移 (CS) 张量参数.
- 电场梯度 (EFG) 和CS张量器的第一原理计算 (CASTEP,Gaussian 03)
主要成果:
- (209) 在9.4 T的Bi SSNMR光谱显示了0.9到14.6 MHz的粉末图案,产生78-256 MHz的CQ值.
- 在21.1 T的实验减少了光谱宽度和获取时间,允许观察化学转移异性质.
- 提取的EFG和CS张量参数与木位分子结构的相关性很好.
结论:
- 在超高场的超宽线 (209) Bi SSNMR 提供了快速获取和高灵敏度.
- 核磁共振参数对珠环境敏感,有助于表征.
- (209) BiSSNMR是分析各种含有Bi的材料的宝贵工具.
相关概念视频
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