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Inorg Chem. 2008 Sep 1;47(17):7874-9. doi: 10.1021/ic8007409. Epub 2008 Jul 30.

On the structure of amorphous calcium carbonate--a detailed study by solid-state NMR spectroscopy.

Author information

1
Inorganic Chemistry, University of Duisburg-Essen, Universitaetsstr. 5-7, 45117 Essen, Germany.

Abstract

The calcium carbonate phases calcite, aragonite, vaterite, monohydrocalcite (calcium carbonate monohydrate), and ikaite (calcium carbonate hexahydrate) were studied by solid-state NMR spectroscopy ( (1)H and (13)C). Further model compounds were sodium hydrogencarbonate, potassium hydrogencarbonate, and calcium hydroxide. With the help of these data, the structure of synthetically prepared additive-free amorphous calcium carbonate (ACC) was analyzed. ACC contains molecular water (as H 2O), a small amount of mobile hydroxide, and no hydrogencarbonate. This supports the concept of ACC as a transient precursor in the formation of calcium carbonate biominerals.

PMID:
18665585
DOI:
10.1021/ic8007409
[Indexed for MEDLINE]

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