van Eck, E.R.H. and Smith, M.E. and Kohn, S.C. (1999) Observation of hydroxyl groups by O-17 solid-state multiple quantum MAS NMR in sol-gel-produced silica. Solid State Nuclear Magnetic Resonance, 15 (3). pp. 181-188. ISSN 0926-2040.
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O-17 NMR parameters (C-Q, eta, delta(iso) and T-1) are reported for both Si-O-Si and Si-OH fragments within a silica gel. The Si-OH units have a wide spread of parameters but are typically characterised by a very short T-1 (similar to 0.1 ms) and C-Q < 200 kHz. These observations have extremely important implications for the quantification of such units in these gels and related glassy materials by O-17 NMR. In light of these observations, the O-17 NMR experiments have been optimised and a distinct resonance from the OH group is observed in 1D static and magic angle spinning (MAS) NMR measurements as well in the multiple quantum (MQ) experiment.
|Uncontrolled keywords:||17-O solid-state NMR; Hydroxyls; Silica gel; Multiple quantum|
|Subjects:||Q Science > QD Chemistry
Q Science > QC Physics
|Divisions:||Faculties > Science Technology and Medical Studies > School of Physical Sciences|
|Depositing User:||F.D. Zabet|
|Date Deposited:||19 Mar 2009 18:42|
|Last Modified:||25 Mar 2009 17:15|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/16703 (The current URI for this page, for reference purposes)|
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