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Related Concept Videos

Metallic Solids02:37

Metallic Solids

19.6K
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....
19.6K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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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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Structural Isomerism02:34

Structural Isomerism

20.3K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
20.3K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.9K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.9K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

10.3K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
10.3K
Network Covalent Solids02:18

Network Covalent Solids

15.1K
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...
15.1K

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Related Experiment Video

Updated: Oct 19, 2025

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework

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Semiconductive coordination polymers with continuous π-π interactions and defined crystal structures.

Yong Yan1, Stefan Henfling1, Ning-Ning Zhang2

  • 1Fakultät für Chemie und Mineralogie, Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, Leipzig 04103, Germany. Krautscheid@rz.uni-leipzig.de.

Chemical Communications (Cambridge, England)
|September 21, 2021
PubMed
Summary
This summary is machine-generated.

Two new semiconductive coordination polymers were synthesized. Their electrical conductivity is attributed to strong π-π interactions, enhancing charge transport performance.

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Supramolecular Chemistry

Background:

  • Coordination polymers offer tunable electronic properties.
  • Redox-active ligands are crucial for designing functional materials.
  • Understanding charge transport mechanisms in organic materials is essential.

Purpose of the Study:

  • Synthesize and characterize novel semiconductive coordination polymers.
  • Investigate the relationship between molecular structure and electrical conductivity.
  • Elucidate the role of intermolecular interactions in charge transport.

Main Methods:

  • Chemical synthesis of coordination polymers.
  • Single-crystal X-ray diffraction for structural characterization.
  • Electrical conductivity measurements.
  • Density Functional Theory (DFT) calculations.

Main Results:

  • Two coordination polymers incorporating a chelating redox-active ligand were successfully synthesized.
  • Materials exhibit moderate electrical conductivity (approx. 10^-5 S m^-1).
  • Strong and continuous intermolecular π-π interactions were identified as key structural features.
  • DFT calculations confirmed that π-π stacking facilitates orbital overlap, enhancing charge transport.

Conclusions:

  • The synthesized coordination polymers demonstrate semiconductive properties.
  • Intermolecular π-π interactions are critical for achieving efficient charge transport in these materials.
  • The findings provide insights into the design of advanced organic electronic materials.