Accurate quantitative and maximum cross polarization via multiple ramped contacts

作者：Liu, Huawei; Zhou, Xiaoyue; Chen, Qun^*; Zhang, Shanmin^*

来源：Chemical Physics Letters, 2017, 679: 233-236.

DOI：10.1016/j.cplett.2017.05.009

• Maximum cross polarization
• Bidirectional polarization transfer
• Quantitative C-13 spectrum
• Multi-stage ramped cross polarization

In this study, a multiple ramped CP (RAMPnCP) method is proposed. A maximum polarization transfer is achieved on the glycine using RAMPnCP. A theoretical solution is also derived based on the reciprocity relation indicating CP is bidirectional. The experimental results match well with the theoretical model. Under the T-1 rho compensation, all the polarizations of the (CH)-C-13, (CH2)-C-13, (CH3)-C-13, and (COOH)-C-13 groups become similar, which can be used in the quantitative measurement of the C-13 spectrum. It is quite promising to become a best member in quantitative study in the future.

• 出版日期2017-7-1
• 单位华东师范大学