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Aldehydes and Ketones with Water: Hydrate Formation01:20

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An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
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Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
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An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
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Enthalpy changes are typically tabulated for reactions in which both the reactants and products are at the same conditions. A standard state is a commonly accepted set of conditions used as a reference point for the determination of properties under other different conditions. For chemists, the IUPAC standard state refers to materials under a pressure of 1 bar and solutions at 1 M and does not specify a temperature. Many thermochemical tables list values with a standard state of 1 atm. Because...
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Methane Hydrate Crystallization on Sessile Water Droplets
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CO2 Hydration Shell Structure and Transformation.

Samual R Zukowski1, Pavlin D Mitev2, Kersti Hermansson2

  • 1Department of Chemistry, Purdue University , West Lafayette, Indiana 47907, United States.

The Journal of Physical Chemistry Letters
|June 10, 2017
PubMed
Summary
This summary is machine-generated.

The hydration shell of carbon dioxide (CO2) exhibits a tetrahedral structure disrupted by water hydrogen bonds. This structure transforms to a disordered state near physiological temperatures, suggesting biological relevance.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Spectroscopy

Background:

  • Understanding the hydration shell of small molecules like carbon dioxide (CO2) is crucial for various chemical and biological processes.
  • Previous studies have suggested the presence of hydrogen bonding between CO2 and water, but direct characterization of the CO2 hydration shell structure has been challenging.

Purpose of the Study:

  • To characterize the structure of the hydration shell surrounding carbon dioxide (CO2) in water.
  • To investigate the role of hydrogen bonding between CO2 and water molecules.
  • To explore the temperature-dependent structural dynamics of the CO2 hydration shell.

Main Methods:

  • Raman multivariate curve resolution (Raman-MCR) spectroscopy was employed to analyze experimental data.
  • Ab initio molecular dynamics (AIMD) simulations were used to calculate vibrational density of states.
  • These methods were combined to validate the assignment of experimental spectroscopic features.

Main Results:

  • The hydration shell of CO2 was found to be predominantly tetrahedral.
  • Evidence of a weak hydrogen bond between CO2 and water was confirmed, occasionally disrupting the tetrahedral structure with entropically stabilized defects.
  • A temperature-dependent structural transformation was observed, leading to a more disordered (less tetrahedral) hydration shell at higher temperatures.

Conclusions:

  • The study confirms a weak CO2-water hydrogen bond and its influence on the hydration shell structure.
  • The observed temperature-dependent transformation of the CO2 hydration shell structure occurs near physiological temperatures, indicating potential biological significance.
  • The findings provide insights into the molecular interactions and dynamics of CO2 in aqueous environments.