Recoupling dipolar interactions with multiple I=1 quadrupolar nuclei: A 11B{6Li} and 31P{6Li} rotational echo double resonance study of lithium borophosphate glasses.
作者： Lena Marie Funke , Henrik Bradtmüller , Hellmut Eckert
DOI: 10.1016/J.SSNMR.2017.02.004
关键词: Nutation 、 Coupling constant 、 Dipole 、 Nuclear magnetic resonance 、 Chemistry 、 Parameter space 、 Lithium 、 Magnetic dipole–dipole interaction 、 Boron 、 Resonance 、 Molecular physics
摘要: The case of rotational echo double resonance (REDOR) experiments on the observe nuclei 11B and 31P interacting with multiple I=1 quadrupolar is analyzed in detail by SIMPSON simulations experimental studies. define region within parameter space spanned nutation frequency, coupling constant spinning frequency where parabolic analysis initial REDOR curve terms dipolar second moments has validity. predictions are tested studies crystalline model compounds lithium diborate pyrophosphate, which subsequently extended to measure M2(11B{6Li}) M2(31P{6Li}) three borophosphate glasses. data indicate that cations interact significantly more strongly phosphate than borate species, despite formally anionic character four-coordinate boron neutral ultraphosphate (P(3)) units they linked.
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