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Silicon‐29 nuclear magnetic resonance studies of aqueous silicate solutions. 8 spin–lattice relaxation times and mechanisms
Author(s) -
Knight Christopher T. G.,
Harris Robin K.
Publication year - 1986
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260241005
Subject(s) - chemistry , silicate , silicon , relaxation (psychology) , aqueous solution , dipole , spin–lattice relaxation , nuclear magnetic resonance , analytical chemistry (journal) , nuclear quadrupole resonance , physics , psychology , social psychology , organic chemistry , chromatography
The 29 Si spin–lattice relaxation times, T 1 ( 29 Si), of the various silicate anions present in high‐purity alkaline silicate solutions are reported. Regular silicate cages display the longest T 1 ( 29 Si) values and, in the case of the cubic octameric cage, an unexpectedly large nuclear Overhauser enhancement, indicating that, unlike the smaller silicate oligomers, the cubic octamer relaxes primarily via the ( 29 Si, 1 H) dipole‐dipole interaction. This phenomenon provides, inter alia , a simple diagnostic test for such cages.