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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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. Many...
The Seven Crystal Systems: Overview01:24

The Seven Crystal Systems: Overview

Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific requirements are not imposed on the...
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

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 – the...
Crystallographic Point Groups01:29

Crystallographic Point Groups

Crystallographic point groups represent the various symmetry operations that can occur within crystals. They are unique in that at least one point will always remain unchanged during these actions. For instance, consider the triclinic system. This system, devoid of any axis or plane of symmetry, aligns with the C1 and Ci point groups.where Cᵢ is characterized solely by a center of inversion.Contrastingly, the monoclinic system introduces an element of symmetry. This system with one plane and...
Structures of Solids02:22

Structures of Solids

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...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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...

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Microfluidic Pneumatic Cages: A Novel Approach for In-chip Crystal Trapping, Manipulation and Controlled Chemical Treatment
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Engineering cocrystal and polymorph architecture via pseudoseeding.

Tomislav Friscić1, Leonard R Macgillivray

  • 1Department of Chemistry, University of Iowa, Iowa City 52242-1294 IA, USA.

Chemical Communications (Cambridge, England)
|March 27, 2009
PubMed
Summary
This summary is machine-generated.

Researchers used a 1D chain cocrystal as a template to create a photostable 1D chain structure from components that normally form a photoactive 0D assembly.

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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Area of Science:

  • Materials Science
  • Crystallography
  • Supramolecular Chemistry

Background:

  • Cocrystals can exhibit diverse assembly structures, influencing their properties.
  • Photoactive materials often form 0D assemblies, which can limit their stability.
  • Templating strategies are crucial for controlling crystal structures.

Purpose of the Study:

  • To utilize a 1D hydrogen-bonded chain cocrystal as a pseudoseed.
  • To template the formation of a photostable 1D chain structure.
  • To convert a photoactive 0D assembly into a photostable 1D structure.

Main Methods:

  • Cocrystal synthesis using a 1D chain as a pseudoseed.
  • Structural characterization of the resulting cocrystal.
  • Photostability assessment of the 0D and 1D assemblies.

Main Results:

  • The 1D chain cocrystal successfully templated the formation of a new cocrystal structure.
  • The templated cocrystal adopted a 1D chain arrangement.
  • The resulting 1D chain cocrystal exhibited enhanced photostability compared to the 0D assembly.

Conclusions:

  • A 1D hydrogen-bonded chain cocrystal can serve as an effective pseudoseed for templating.
  • This templating approach enables the transformation of photoactive 0D assemblies into photostable 1D structures.
  • The strategy offers a pathway to design and synthesize photostable crystalline materials.