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Molecular and Ionic Solids02:54

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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.
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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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Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
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Ionic Association

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The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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Nonideal Two-Component Liquid Solutions01:29

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Nonideal liquid solutions, also known as real solutions, do not strictly follow Raoult's law. Raoult's law is a rule of thumb in physical chemistry. However, not all mixtures adhere to this law due to varying molecular interactions. For example, in an acetone/chloroform solution, the individual vapor pressures of the components are lower than expected, resulting in a total vapor pressure below that predicted by Raoult's law, causing a negative deviation.On the other hand, in an ethanol/water...
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
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Ionic clusters vs shear viscosity in aqueous amino acid ionic liquids.

Vitaly V Chaban1, Eudes Eterno Fileti

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Researchers explored amino acid ionic liquids (AAILs) in water using simulations. They found correlations between AAIL cluster composition and viscosity, aiding in predicting properties for designing new AAILs.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Biochemistry

Background:

  • Aqueous solutions of amino acid ionic liquids (AAILs) are crucial for protein synthesis, solubilization, and enzymatic reactions.
  • Understanding the behavior of AAILs in water is essential for optimizing their applications.

Purpose of the Study:

  • To investigate the shear viscosity and cluster compositions of three 1-ethyl-3-methylimidazolium (emim) amino acid salts in aqueous solutions.
  • To establish correlations between cluster composition and viscosity for these AAILs.
  • To provide insights for the design and application of AAILs.

Main Methods:

  • Molecular dynamics simulations were performed using a custom force field.
  • The study examined [emim][ala], [emim][met], and [emim][trp] solutions at various concentrations (2, 5, 10, 20, and 30 mol %) in water.
  • Simulations were conducted at a constant temperature of 310 K.

Main Results:

  • The study established novel correlations between the cluster composition and shear viscosity of the investigated AAIL solutions.
  • Numerical observations and qualitative correlations were analyzed in relation to the chemical structures of the amino acid anions.
  • The findings suggest that knowledge of either cluster composition or viscosity can be used to infer the other property.

Conclusions:

  • The established correlations offer a pathway to predict AAIL properties, facilitating efficient design and application development.
  • This research enhances the understanding of structure-property relationships in amino acid ionic liquid solutions.
  • The results are valuable for advancing the use of AAILs in diverse scientific and industrial fields.