Hydrogen Bonding in Amorphous Alkaline Earth Carbonates
Sebastian Leukel1,2, Mihail Mondeshki1, Wolfgang Tremel1
1Institut für Anorganische Chemie und Analytische Chemie , Johannes Gutenberg-Universität , Duesbergweg 10-14 , D-55128 Mainz , Germany.
Amorphous alkaline earth carbonates contain water and exhibit varying hydrogen bond strengths. Magnesium carbonate uniquely includes hydroxide ions, influencing its bonding network.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Spectroscopy
Background:
- Amorphous intermediates are key in alkaline earth carbonate crystallization.
- Understanding their structure and bonding is crucial for controlling crystallization.
Purpose of the Study:
- To investigate the hydrogen bonding and water environments in amorphous magnesium, calcium, strontium, and barium carbonates.
- To correlate cation properties with hydrogen bond strength and water dynamics.
Main Methods:
- Synthesis of amorphous carbonates from methanolic solutions.
- Fourier transform IR spectroscopy and 1H NMR spectroscopy for local environment analysis.
- Heteronuclear correlation and temperature-dependent spin-lattice relaxation experiments for water motion and hydrogen bonding.
Main Results:
- Pearson hardness of the cation correlates with hydrogen bond strength.
- Amorphous magnesium carbonate contains hydroxide ions, acting as strong hydrogen-bond acceptors.
- Amorphous calcium carbonate displays the weakest hydrogen bonds among the studied carbonates.
Conclusions:
- A comprehensive understanding of hydrogen bonding in transient amorphous carbonates was achieved.
- Cation properties significantly influence the hydrogen-bonding network and water interactions.
- This research deepens the understanding of carbonate crystallization processes.
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