Two novel silicate anions, a singly-substituted cubic octamer (double four-ring cage with a pendant orthosilicate group) and its dimeric counterpart (two octameric cages linked by a single siloxane bridge), are detected by 29Si NMR spectroscopy in concentrated tetraalkylammonium silicate solutions at the low alkalinity and high SiO2 concentration typical of zeolite synthesis slurries.
S. D. Kinrade, J. C. H. Donovan, A. S. Schach and C. T. G. Knight, J. Chem. Soc., Dalton Trans., 2002, 1250 DOI: 10.1039/B107758A
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