title: 1H, 29Si and 1H, 23Na heteronuclear shift correlation in octosilicate via cross-polarisation.
abstract: Solid-state magic-angle spinning was used to study octosilicate, a layered sodium polysilicate hydrate. Conventional one-dimensional NMR spectra detect two distinct proton and silicon sites and a single sodium species. Heteronuclear shift correlation experiments have shown that only one type of proton is involved in efficient cross-polarisation to all the silicon and sodium sites. Such selectivity could be caused by a favourable position for, and suitable rigidity of, this strongly hydrogen-bonded proton. The latter requirement can be used to propose a simple model of the interlayer space in octosilicate.
authors.affiliation: Department of Chemistry, University of Durham, UK.
authors.forename: G G
authors.initials: GG
authors.lastname: Almond
authors.forename: R K
authors.initials: RK
authors.lastname: Harris
authors.forename: K R
authors.initials: KR
authors.lastname: Franklin
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D006859:Hydrogen; D006860:Hydrogen Bonding; D007554:Isotopes; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D011522:Protons; D017640:Silicates / Q000737:chemistry*; D012825:Silicon; D012975:Sodium Isotopes; D013057:Spectrum Analysis
chemical_list: D007554:Isotopes; D011522:Protons; D017640:Silicates; D012975:Sodium Isotopes; C101566:octosilicate; D006859:Hydrogen; D012825:Silicon