Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/2364
Title: Carbonic acid: molecule, crystal and aqueous solution
Authors: Reddy, Sandeep K.
Balasubramanian, Sundaram
Keywords: Chemistry
C-13 Isotopic Forms
Set Model Chemistry
Astrophysical Relevance
Ocean Acidification
Calcium-Carbonate
Glassy Solutions
Ftir Spectra
Co2 Capture
Gas-Phase
H2Co3
Issue Date: 2014
Publisher: Royal Society of Chemistry
Citation: Reddy, SK; Balasubramanian, S, Carbonic acid: molecule, crystal and aqueous solution. Chemical Communications 2014, 50 (5) 503-514, http://dx.doi.org/10.1039/c3cc45174g
Chemical Communications
50
5
Abstract: Carbonic acid (CA) is a crucial species in the equilibrium between carbon dioxide, water and many minerals. Yet many of its properties have either not been studied at all, or have been misunderstood. Its short lifetime in the presence of moisture has been a major stumbling block in efforts to studying it. Over the last two decades, there has been a sustained, albeit slow progress in the detection, synthesis and investigations of CA in its various phases - as a molecule in gas phase, in its crystalline state, as an adsorbate on mineral surfaces and in aqueous solutions. For instance, ultrafast time resolved spectroscopic experiments as well as molecular dynamics based free energy calculations using Kohn-Sham density functional theory have shown the pK(a) of CA to be around 3.5 which makes its acidity comparable to that of formic acid. The composition of its gas phase in terms of its conformer and oligomer population have also been examined. Thin films of crystalline carbonic acid polymorphs have been synthesized and characterized using infrared and Raman spectra. Given the difficulties associated in the conduct of experiments to investigate CA, computational modelling has played a significant role. Using a multi-tiered modelling approach, we have been able to examine several model crystal structures possessing distinctive hydrogen bonding motifs. Their vibrational spectra were compared against those obtained from experiments. A model crystal consisting of hydrogen bonded molecules in a chain-like fashion fits the experimental vibrational spectra of beta-carbonic acid better than one in which the motif is two-dimensional (sheet-like). Under dry conditions, we predict such a crystal to be stable below 359 K at 1 atm. In this feature article, we provide a summary of our work on carbonic acid as well as review contributions from others.
Description: Restricted Access
URI: http://hdl.handle.net/10572/2364
ISSN: 1359-7345
Appears in Collections:Research Articles (Balasubramanian Sundaram)

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