単一結晶のX線 difraktion構造の共性有機フレームワーク

Tianqiong Ma^1,2, Eugene A Kapustin³, Shawn X Yin⁴

¹State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, China.

Science (New York, N.Y.)

|July 7, 2018

まとめ

研究者は,多孔性共性有機フレームワーク (COF) の大きな単一結晶を育成する方法を開発しました. この突破は,COFの特徴化における以前の制限を克服し,精密な原子レベルの構造分析を可能にします.

科学分野:

材料化学
クリスタルグラフィー
超分子化学

背景:

結晶化は,多孔共性有機フレームワーク (COF) の化学における重要な課題である.
COFの構造的特徴は,主にモデリングと微分データ分析に限定されており,原子精度が欠けている.

研究の目的:

三次元イミンベースのCOFの大きな単体結晶を育成するための一般的な手順を開発する.
単結晶X線微分法を用いて高解像度でCOFの構造を決定する.

主な方法:

イミンベースのCOFの単結晶成長のための一般的な手順を開発した.
高解像度データ (最大0.83アングストロムの解像度) を収集するために単結晶X線微分法を使用した.
明確な構造の溶液と精密なアニゾトロプ的精錬を行いました.

主要な成果:

COF-300,その水素化形態,COF-303,LZU-79,およびLZU-111の大きな単一結晶を成功裏に成長させました.
構造特性を解読する原子精度を達成し相互浸透,ゲスト分子の配置,およびリンク器の障害を含む.
珍しいトポロジーを特定し詳細を逆転させました

結論:

開発された方法は,COF化学における結晶化課題を克服します.
単一結晶のX線 difraktionは以前には達成できなかった決定的な構造の洞察を提供します
先進的な材料設計のためのCOF構造の正確な理解を可能にします.

さらに関連する動画

$Crystallization of Proteins on Chip by Microdialysis for In Situ X-ray Diffraction Studies$ 12:38

Crystallization of Proteins on Chip by Microdialysis for In Situ X-ray Diffraction Studies

Published on: April 11, 2021

7.0K

$X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects$ 09:16

X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects

Published on: June 8, 2016

16.8K

関連する概念動画

02:46

Covalent Bonding and Lewis Structures

61.5K

Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.

61.5K

02:18

X-ray Crystallography

26.2K

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...

26.2K

$X-ray Diffraction of Biological Samples$ 01:10

X-ray Diffraction of Biological Samples

4.8K

X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are scattered by the electron clouds around the sample atoms. The X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...

4.8K

02:42

Ionic Crystal Structures

17.2K

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

Covalent Bonds

Network Covalent Solids

16.2K

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...