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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
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Isomerism in Complexes
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Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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Non-Covalent Derivatives: Cocrystals and Eutectics.

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Non-covalent derivatives (NCDs) enhance material properties like solubility and stability. These versatile, eco-friendly compounds offer a cost-effective alternative to traditional synthetic modifications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Pharmaceutical Sciences

Background:

  • Non-covalent derivatives (NCDs) are formed by integrating coformer molecules into a parent molecule's matrix using non-covalent forces.
  • These forces include ionic, Van der Waals, hydrogen bonding, lipophilic-lipophilic, and pi-pi interactions.
  • NCDs, encompassing cocrystal and eutectic forms, exhibit unique supramolecular matrix properties.

Purpose of the Study:

  • To highlight the formation and properties of non-covalent derivatives (NCDs).
  • To emphasize the potential of NCDs in tailoring material performance.
  • To present NCDs as an environmentally friendly and cost-effective approach.

Main Methods:

  • Formation of NCDs through the incorporation of coformer molecules via non-covalent interactions.
  • Characterization of NCDs to understand their unique supramolecular matrix properties.
  • Evaluation of NCDs for applications requiring enhanced solubility, stability, and bioavailability.

Main Results:

  • NCDs possess unique properties derived from their supramolecular matrix, impacting critical performance factors.
  • Key performance factors influenced by NCDs include solubility, stability, and bioavailability.
  • NCDs have demonstrated utility in diverse material applications.

Conclusions:

  • Non-covalent derivatives offer a versatile method for material property modification.
  • NCDs provide an environmentally friendly and cost-effective alternative to conventional synthetic routes.
  • The potential applications for NCDs span a broad range of materials and processes.