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