Correction to Quantitative Identification of Metastable Magnesium Carbonate Minerals by Solid-State <sup>13</sup>C NMR Spectroscopy

Moore, Julia; Surface, J. Andrew; Brenner, Allison; Wang, Louis S.; Skemer, Philip; Conradi, Mark S.; Hayes, Sophia E.

doi:10.1021/acs.est.5b00368

Cited by 4 publications

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“…20 In this study, the 13 C chemical shift anisotropies of the carbonate ions in magnesite and Mg-ACC were expected to be similar. 22,23 The use of proton decoupling during the REDOR dephasing period alleviated the concerns of the variation in water content among the samples. Because the 25 Mg nuclei of the model compound and the samples have comparable quadrupolar interactions, the excitation efficiency of their central transitions are about the same.…”

Section: ■ Resultsmentioning

confidence: 99%

Structural Characterization of Mg-Stabilized Amorphous Calcium Carbonate by Mg-25 Solid-State NMR Spectroscopy

et al. 2015

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Biogenic amorphous calcium carbonates (ACCs) play a crucial role in the mineralization process of calcareous tissue. Most biogenic ACCs contain Mg ions, but the coordination environment of Mg, which may influence the kinetics of the phase transformation of an ACC, remains poorly understood. We demonstrate that Mg-25 solid-state NMR can be used to probe the coordination shells of Mg in synthetic ACCs. The variation in Mg-25 chemical shifts suggests that Mg−O bond lengths increase as Mg content increases. On the basis of the Van Vleck second moments obtained from the double-resonance NMR experiments, we infer that the average number of carbonates surrounding the central Mg ion is in the range of 4−4.5 and that there is at least one water molecule coordinated to each Mg ion for the synthetic Mg-ACC samples. We suggest that the stability of Mg-ACC is owing to the structural water bound to Mg ions, which increases considerably the activation energy associated with the dehydration of Mg-ACC.

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Section: ■ Resultsmentioning

confidence: 99%

Structural Characterization of Mg-Stabilized Amorphous Calcium Carbonate by Mg-25 Solid-State NMR Spectroscopy

et al. 2015

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“…24 For nesquehonite (MgCO 3 × 3 H 2 O), Moore and co-workers proposed a description as hydrogen carbonate (Mg(OH)-(HCO 3 ) × 3 H 2 O) to be more accurate. 77 We assume to have a comparable situation in AMC, even though the intensity ratios of the three signals (80% to 16% to 4%) show that hydrogen carbonate can only be a minority species.…”

Section: Inorganic Chemistrymentioning

confidence: 99%

Hydrogen Bonding in Amorphous Alkaline Earth Carbonates

2018

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Amorphous intermediates play a crucial role during the crystallization of alkaline earth carbonates. We synthesized amorphous carbonates of magnesium, calcium, strontium, and barium from methanolic solution. The local environment of water and the strength of hydrogen bonding in these hydrated modifications were probed with Fourier transform IR spectroscopy, H NMR spectroscopy, and heteronuclear correlation experiments. Temperature-dependent spin-lattice (T1) relaxation experiments provided information about the water motion in the amorphous materials. The Pearson hardness of the respective divalent metal cation predominantly determines the strength of the internal hydrogen-bonding network. Amorphous magnesium carbonate deviates from the remaining carbonates, as it contains additional hydroxide ions, which act as strong hydrogen-bond acceptors. Amorphous calcium carbonate exhibits the weakest hydrogen bonds of all alkaline earth carbonates. Our study provides a coherent picture of the hydrogen bonding situation in these transient species and thereby contributes to a deeper understanding of the crystallization process of carbonates.

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Stacking faults of the hydrous carbonate-containing brucite (HCB) phase in hydrated magnesium carbonate cements

Jansen,

German,

Ectors

et al. 2024

Cement and Concrete Research

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Correction to Quantitative Identification of Metastable Magnesium Carbonate Minerals by Solid-State ¹³C NMR Spectroscopy

Cited by 4 publications

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Structural Characterization of Mg-Stabilized Amorphous Calcium Carbonate by Mg-25 Solid-State NMR Spectroscopy

Structural Characterization of Mg-Stabilized Amorphous Calcium Carbonate by Mg-25 Solid-State NMR Spectroscopy

Hydrogen Bonding in Amorphous Alkaline Earth Carbonates

Stacking faults of the hydrous carbonate-containing brucite (HCB) phase in hydrated magnesium carbonate cements

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Correction to Quantitative Identification of Metastable Magnesium Carbonate Minerals by Solid-State 13C NMR Spectroscopy

Cited by 4 publications

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Structural Characterization of Mg-Stabilized Amorphous Calcium Carbonate by Mg-25 Solid-State NMR Spectroscopy

Structural Characterization of Mg-Stabilized Amorphous Calcium Carbonate by Mg-25 Solid-State NMR Spectroscopy

Hydrogen Bonding in Amorphous Alkaline Earth Carbonates

Stacking faults of the hydrous carbonate-containing brucite (HCB) phase in hydrated magnesium carbonate cements

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Correction to Quantitative Identification of Metastable Magnesium Carbonate Minerals by Solid-State ¹³C NMR Spectroscopy