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Related Concept Videos

Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
Structural Isomerism02:34

Structural Isomerism

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 be...
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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...
Structure of Amines01:19

Structure of Amines

The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are illustrated in Figure...

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PbMnIn2S5: synthesis, structure, and properties.

Peng Yu1, Li-Ming Wu, Ling Chen

  • 1Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China.

Inorganic Chemistry
|January 9, 2013
PubMed
Summary
This summary is machine-generated.

Researchers discovered PbMnIn(2)S(5), a novel manganese compound, using high-temperature synthesis. This new material exhibits an interesting crystal structure and antiferromagnetic properties, with an optical band gap of 1.45 eV.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Crystallography

Background:

  • The Pb-M-In-Q system is explored for novel material discovery.
  • Manganese-containing compounds are of interest for their magnetic properties.

Purpose of the Study:

  • To synthesize and characterize the first manganese-containing compound in the Pb-M-In-Q system.
  • To investigate the crystal structure, magnetic interactions, and optical properties of the new material.

Main Methods:

  • High-temperature solid-state reaction for synthesis.
  • X-ray diffraction for crystal structure determination (orthorhombic, Cmcm, a=3.896(2) Å, b=12.731(7) Å, c=15.770(9) Å, Z=1).
  • Optical spectroscopy to measure the band gap.

Main Results:

  • The novel compound PbMnIn(2)S(5) was successfully synthesized.
  • It adopts a Sr(2)Tl(2)O(5) structure type with a 3D framework of interconnected octahedra and Pb(2+) cations in bicapped triangular prisms.
  • Disordered distribution of Mn and In atoms observed in specific crystallographic sites.
  • Antiferromagnetic interactions were identified due to high-spin Mn(2+) anions.
  • An optical band gap of approximately 1.45 eV was measured.

Conclusions:

  • PbMnIn(2)S(5) represents a new structural and chemical entity in the Pb-M-In-Q system.
  • The unique crystal structure facilitates antiferromagnetic coupling.
  • The measured band gap suggests potential applications in optoelectronic devices.