使用超极化129Xe核磁共振光谱探测硅烷化介孔MCM-41上的烷基配体。

Probing the alkyl ligands on silylated mesoporous MCM-41 using hyperpolarized 129Xe NMR spectroscopy.

作者信息

Huang Shing-Jong, Huang Chin-Hui, Chen Wen-Hua, Sun Xianping, Zeng Xizhi, Lee Huang-Kuei, Ripmeester John A, Mou Chuan-Yuan, Liu Shang-Bin

机构信息

Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 106, Taiwan.

出版信息

J Phys Chem B. 2005 Jan 20;109(2):681-4. doi: 10.1021/jp044984g.

DOI:10.1021/jp044984g

PMID:16866426

Abstract

Variable-temperature hyperpolarized (HP) 129Xe NMR spectroscopy has been employed to characterize surface properties of mesoporous MCM-41 modified by silylation treatment. The characteristic chemical shifts responsible for Xe-surface interactions exhibit strong correlations with both the surface coverage and chain length of the grafted alkylsilanes. Consequently, the deshielding medium contribution due to individual alkyl ligand can be deduced based on the group contribution analysis revealing the potential use of HP 129Xe NMR for probing the surface properties of organic-functionalized porous materials.

摘要

变温超极化（HP）129Xe核磁共振光谱已被用于表征经硅烷化处理改性的介孔MCM-41的表面性质。负责Xe-表面相互作用的特征化学位移与接枝烷基硅烷的表面覆盖率和链长均表现出强烈的相关性。因此，基于基团贡献分析可以推断出单个烷基配体引起的去屏蔽介质贡献，这揭示了HP 129Xe NMR在探测有机功能化多孔材料表面性质方面的潜在用途。