分子結晶における多形固体溶液:ヒント,トリック,スイッチ
Adam Hill1,2, Weronika Kras2, Fragkoulis Theodosiou1,2
1Department of Chemistry, University of Durham, Lower Mount Joy, South Rd, Durham, DH1 3LE, U.K.
Journal of the American Chemical Society
|September 6, 2023
まとめ
分子固体溶液は一般的であり,結晶の性質に影響します. この研究は,命名法を提案し,特徴付けの課題を議論し,ベンザミドをモデルとして使用して,固体溶液がポリモルフの安定性をどのように変化させるかを示しています.
科学分野:
- クリスタルグラフィー
- 材料科学
- 医薬品科学
背景:
- 結晶の多形性は医薬品において極めて重要であり,分子固体の溶液はしばしば見過ごされます.
- 分子化合物は 固体溶液を形成する不純物を含んでいて 浄化が難しくなります
- 固体溶液の理解は,その普及と結晶の特性への影響のために不可欠です.
研究 の 目的:
- ポリモルフィズムが可能な分子結晶固体溶液の命名法を提案する.
- これらのシステムの実験的および計算的特徴化における課題を強調する.
- ポリモルフの安定性を変化させる固体溶液の一般的な現象を証明する.
主な方法:
- 新規の分類体系の開発
- 実験的および計算的特徴化技術のレビューと議論.
- ニコチナミドと3-フッ素ベンザミドによるベンザミドベースの固体溶液の実験調査
主要な成果:
- 分子結晶固体溶液のための新しい命名体系が提案されています.
- これらの複雑なシステムの特徴づけに伴う重要な課題が挙げられます.
- 固体溶液の形成は,ベンザミド系におけるポリモルフの相対的な安定性を一般的に変化させることが示された.
結論:
- 分子固体溶液が一般的であり,結晶の振る舞いに大きく影響する.
- 標準化された命名法と高度な特徴付け方法が必要である.
- ポリモルフの安定性に対する固体溶液の影響は,薬物開発に意味を持つ一般的な現象である.
関連する概念動画
02:54Molecular and Ionic Solids
17.2K
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...
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...
17.2K
01:10Recrystallization: Solid–Solution Equilibria
1.1K
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...
1.1K
02:22Structures of Solids
14.3K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
14.3K
01:21Polymer Classification: Crystallinity
2.9K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.9K
01:25Crystal Growth: Principles of Crystallization
2.1K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
2.1K
02:37Metallic Solids
18.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.5K