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Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Sodium Diisopropylamide: Aggregation, Solvation, and Stability.

Russell F Algera1, Yun Ma1, David B Collum1

  • 1Baker Laboratory, Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14853-1301, United States.

Journal of the American Chemical Society
|May 31, 2017
PubMed
Summary
This summary is machine-generated.

Sodium diisopropylamide (NaDA) forms stable dimers in coordinating solvents like DMEA. Solvent choice dictates dimer structure, influencing reactivity and stability, with THF forming cyclic dimers and DME forming chelated dimers.

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Area of Science:

  • Organometallic chemistry
  • Solution-state chemistry
  • Spectroscopy

Background:

  • Sodium diisopropylamide (NaDA) is a widely used strong base in organic synthesis.
  • Understanding its behavior in solution is crucial for controlling reactivity.
  • Coordinating solvents significantly influence the aggregation state and properties of alkali metal amides.

Purpose of the Study:

  • To elucidate the solution structures, stabilities, and reactivities of NaDA.
  • To investigate the impact of various coordinating solvents on NaDA aggregation.
  • To determine the mechanisms of solvent decomposition by NaDA.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy (e.g., 1H, 13C, 7Li, 23Na).
  • Computational studies (e.g., DFT calculations).
  • Kinetic studies of solvent decomposition.

Main Results:

  • NaDA is stable in DMEA, forming a disolvated symmetric dimer.
  • Tetrahydrofuran (THF) displaces DMEA, leading to a tetrasolvated cyclic dimer.
  • Dimethoxyethane (DME) and TMEDA displace DMEA, forming doubly chelated dimers.
  • Tridentate ligands act as bidentate ligands.
  • Solvent decomposition rates were determined, suggesting monomer-based mechanisms for THF and DME.

Conclusions:

  • The aggregation state and structure of NaDA are highly dependent on the coordinating solvent.
  • Solvent coordination influences the stability and reactivity of NaDA.
  • Monomer-based mechanisms are proposed for the decomposition of THF and DME by NaDA.