Hydrogen bonding induced distortion of CO3 units and kinetic stabilization of amorphous calcium carbonate: results from 2D (13)C NMR spectroscopy.
Hydrogen bonding induced distortion of CO3 units and kinetic stabilization of amorphous calcium carbonate: results from 2D (13)C NMR spectroscopy.
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氢键引起 CO3 单元变形和无定形碳酸钙的动力学稳定性:2D (13)C NMR 光谱的结果。
DOI:
10.1039/c6cp02729f
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
S. Clark
中科院分区:
文献类型:
--
作者:
S. Sen;D. Kaseman;B. Colas;Dorrit E Jacob;S. Clark
Systematic correlation in alkaline-earth carbonate compounds between the deviation of the CO3 units from the perfect D3h symmetry and their (13)C nuclear magnetic resonance (NMR) chemical shift anisotropy (CSA) parameters is established. The (13)C NMR CSA parameters of amorphous calcium carbonate (ACC) are measured using two-dimensional (13)C phase adjusted spinning sidebands (PASS) NMR spectroscopy and are analyzed on the basis of this correlation. The results indicate a distortion of the CO3 units in ACC in the form of an in-plane displacement of the C atom away from the centroid of the O3 triangle, resulting from hydrogen bonding with the surrounding H2O molecules, without significant out-of-plane displacement. Similar distortion for all C atoms in the structure of ACC suggests a uniform spatial disposition of H2O molecules around the CO3 units forming a hydrogen-bonded amorphous network. This amorphous network is stabilized against crystallization by steric frustration, while additives such as Mg presumably provide further stabilization by increasing the energy of dehydration.
影响因子:
1.4
作者:
Günther, C;Becker, A;Epple, M
通讯作者:
Epple, M
影响因子:
8.6
作者:
Goodwin, Andrew L.;Michel, F. Marc;Reeder, Richard J.
通讯作者:
Reeder, Richard J.
影响因子:
4.6
作者:
Nebel, Holger;Neumann, Markus;Epple, Matthias
通讯作者:
Epple, Matthias