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Träfflista för sökning "WFRF:(Eden Y) srt2:(2007-2009)"

Sökning: WFRF:(Eden Y) > (2007-2009)

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  • Aski, Sahar Nikkhou, et al. (författare)
  • Studies of Inclusion Complexes of Dichloromethane in Cryptophanes by Exchange Kinetics and 13C NMR in Solution and the Solid State
  • 2008
  • Ingår i: Journal of Physical Chemistry C. ; 112, s. 13873-13881
  • Tidskriftsartikel (refereegranskat)abstract
    • Cryptophanes are molecular hosts having high binding affinities for small, neutral molecules in weakly polar solvents. We have previously studied dichloromethane as a guest inside the cavity of cryptophane-E (cryptophane-333), in solution as well as in the solid state. Here, we present a solution 13C relaxation study of dichloromethane as the guest molecule complexed in the cavity of two smaller hosts: cryptophane-A (cryptophane-222) and cryptophane-223. Carbon-13 relaxation measurements were performed for both guest and host molecules. Exchange kinetics have to be explicitly taken into consideration in order to derive 13C relaxation properties of the bound guest. Rate coefficients were measured using proton 1D-exchange experiments. We have also investigated dichloromethane complexed in the cavity of cryptophane-233 in the solid state, by estimating the motionally averaged 13C-1H dipolar interactions from recoupling experiments under magic angle spinning (MAS) conditions. The measurements for the three cryptophanes provide a consistent set of results for the extent of rotational freedom of the guest inside the host cavities.
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4.
  • Lo, Andy Y. H., et al. (författare)
  • Efficient symmetry-based homonuclear dipolar recoupling of quadrupolar spins : double-quantum NMR correlations in amorphous solids
  • 2008
  • Ingår i: Physical Chemistry, Chemical Physics - PCCP. - : Royal Society of Chemistry (RSC). - 1463-9076 .- 1463-9084. ; 10:44, s. 6635-6644
  • Tidskriftsartikel (refereegranskat)abstract
    • We report novel symmetry-based pulse sequences for exciting double-quantum (2Q) coherences between the central transitions of half-integer spin quadrupolar nuclei in the NMR of rotating solids. Compared to previous 2Q-recoupling techniques, numerical simulations and Na-23 and Al-27 NMR experiments on Na2SO4 and the open-framework aluminophosphate AlPO-CJ19 verify that the new dipolar recoupling schemes display higher robustness to both radio-frequency field inhomogeneity and to spreads in resonance frequencies. These advances allowed for the first demonstration of 2Q-recoupling in an amorphous solid for revealing its intermediate-range structural features, in the context of mapping Al-27-Al-27 connectivities between the aluminium polyhedra (AlO4, AlO5 and AlO6) of a lanthanum aluminate glass (La0.18Al0.82O1.5).
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