Probing the alkyl ligands on silylated mesoporous MCM-41 using hyperpolarized 129Xe NMR spectroscopy.
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.
Huang
Shing-Jong
SJ
Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 106, Taiwan.
Huang
Chin-Hui
CH
Chen
Wen-Hua
WH
Sun
Xianping
X
Zeng
Xizhi
X
Lee
Huang-Kuei
HK
Ripmeester
John A
JA
Mou
Chuan-Yuan
CY
Liu
Shang-Bin
SB