Quadrupolar coupling selective cross-polarization in solid state NMR |
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Authors: | Edén Mattias |
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Affiliation: | Physical Chemistry Division, Arrhenius Laboratory, Stockholm University, SE-106 91, Stockholm, Sweden. mattias@physc.su.se |
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Abstract: | A new strategy is presented for achieving selective heteronuclear polarization transfers from half-integer quadrupolar spins in magic-angle spinning (MAS) NMR. By combining cross-polarization with a recently introduced RAPT pulse sequence that selectively excites the signal of a half-integer quadrupolar nucleus based on its quadrupolar coupling constant magnitude, we demonstrate that hetero-nuclei in its close proximity may be selectively excited. Selective 23Na --> 1H polarization transfers are demonstrated in Na2MoO4 x 2 H2O, Na2HPO4 x 2 H2O and a mixture of NaHCO3 and Na2HPO4 x 2 H2O. |
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