Abstract
2H MAS NMR spectroscopy was applied to investigate the local structure of deuterated paramagnetic Ni2+-containing layered double hydroxides (LDHs) for the first time. Due to significantly smaller electronic dipole interaction, 2H NMR spectra of NiAl-LDHs show much better resolution than 1H NMR spectra, and different hydrogen species, including Ni3OD, Ni2AlOD and interlayer water, can be resolved in 2H NMR spectra. Quantitative analysis of the NMR spectra of LDHs with different Al percentages confirms the ordering of Al3+ ions in the hydroxide sheets (Al-O-Al avoidance). 2H MAS NMR spectroscopy gives new insight into different hydrogen species in paramagnetic NiAl-LDH and this approach can be extended to study the detailed structural information and properties of other paramagnetic LDHs.
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