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Related Concept Videos

Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Acid-Catalyzed Hydration of Alkenes02:45

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Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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Understanding ionic mesophase stabilization by hydration: a solid-state NMR study.

Debashis Majhi1, Jing Dai1, Andrei V Komolkin2

  • 1Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden. sergeid@kth.se.

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Summary
This summary is machine-generated.

Water enhances ionic liquid crystal stability by strengthening hydrogen bonds, despite reducing molecular order. This hydration effect increases ion diffusion anisotropy, crucial for layered structures.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Supramolecular Chemistry

Background:

  • Ionic liquid crystals (ILCs) exhibit unique mesophases influenced by ion interactions and molecular ordering.
  • Understanding the role of hydration in ILCs is crucial for tailoring their properties and applications.
  • Previous studies have explored ILC structure-property relationships, but the specific impact of water on hydrogen bonding and dynamics remains less understood.

Purpose of the Study:

  • To investigate the correlation between water's hydrogen bonding contribution, mesophase order, and ion diffusion in layered ILCs.
  • To elucidate the effects of hydration on hydrogen bonding, molecular dynamics, and orientational order in imidazolium-based ILCs.
  • To determine the influence of water on the stability and properties of the smectic mesophase.

Main Methods:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy to monitor changes in hydrogen bonding, conformational dynamics, and translational diffusion.
  • Density Functional Theory (DFT) analysis to complement experimental findings and provide insights into molecular interactions.
  • Investigation of monohydrated and anhydrous imidazolium-based ionic liquids across varying temperatures.

Main Results:

  • Monohydrated ILCs exhibited enhanced smectic mesophase stability over a wider temperature range compared to anhydrous counterparts.
  • Hydration counterintuitively decreased the orientational order of organic cations, reducing the contribution of cation alignment and dispersion forces to mesophase stability.
  • Increased anisotropy in translational diffusion was observed in hydrated samples, supporting a layer-stabilizing effect of water, outweighing the decrease in molecular order.

Conclusions:

  • Water plays a critical role in stabilizing layered ionic liquid crystalline phases through hydrogen bonding, even with reduced molecular order.
  • The increased interaction energy from water's hydrogen bonding within the ionic sublayer is the dominant factor in mesophase stabilization.
  • Hydration significantly influences the delicate balance between molecular order, hydrogen bonding, and ion dynamics in ILCs.