NDLI: Solid-state NMR study of locations and dynamics of interlayer cationsand water in kanemite

Content Provider	Royal Society of Chemistry (RSC)
Author	Hayashi, Shigenobu
Copyright Year	1997
Abstract	The locations and dynamics of interlayer sodium (Na) cations and water in kanemite have been studied by means of solid-state 1 H, 29 Si and 23 Na NMR. In addition to one-dimensional (1D) spectra, 1 H– 29 Si two-dimensional (2D) cross-polarization (CP) correlation, 23 Na 2D nutation and 23 Na 2D triple-quantum spectra were also measured. Hydroxy groups have a large 1 H chemical shift (15 ppm from tetramethylsilane), forming strong hydrogen bonds of the Si–O–HO - –Si type between the layers. When the amount of water is large, the water molecules are mobile in the interlayer space. With a decrease in the water content, the motion of the water is restricted. There is only one type of Si site in undried kanemite. The decrease in the water content affects the layer structure, which is indicated by a new 29 Si peak. The site of Na + species has an isotropic chemical shift of 2.9 ppm from 1 mol dm -3 NaCl aqueous solution, a quadrupole coupling constant of 2.05 MHz and an asymmetry factor of 0.63. The Na + species do not rotate isotropically, but have a fixed orientation. Water molecules do not coordinate to the Na ions directly.
Starting Page	1043
Ending Page	1048
Page Count	6
File Format	PDF
ISSN	09599428
Volume Number	7
Issue Number	6
Journal	Journal of Materials Chemistry
DOI	10.1039/a607528b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Sodium Nuclear magnetic resonance Nutation Chemical shift Tetramethylsilane Hydrogen bond Isotropy Quadrupole J-coupling
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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