Abstract
The 29Si n.m.r. chemical shifts of 16 sodalites of the general composition M 6+x [SiAlO 4] 6A x·nH 2O (M = alkali metal cation, A = OH −, anion) cover a range of more than 20 ppm and show linear correlations with the SiOAl bond angles and the lattice constants. As a result of the different steric and coordination requirements of the various nonframework constituents, bond-angle variations between 126 and 160° occur, and these can be calculated directly from the chemical shift data. The 29Si chemical shifts and the average SiOAl bond angles of Si(4Al) environments in several other zeolites also fit the same type of correlation that has been established here for the sodalites.
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