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Related Concept Videos

Metallic Solids02:37

Metallic Solids

20.3K
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....
20.3K
Ionic Crystal Structures02:42

Ionic Crystal Structures

16.6K
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...
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Periodic Classification of the Elements04:00

Periodic Classification of the Elements

57.8K
The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
57.8K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

6.7K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
6.7K
Properties of Transition Metals02:58

Properties of Transition Metals

29.1K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.1K
Valence Bond Theory02:42

Valence Bond Theory

10.9K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Two-Dimensional Noble-Metal Chalcogenides and Phosphochalcogenides.

Roman Kempt1, Agnieszka Kuc2, Thomas Heine1,2

  • 1Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Bergstrasse 66, 01069, Dresden, Germany.

Angewandte Chemie (International Ed. in English)
|February 18, 2020
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Noble-metal chalcogenides and phosphochalcogenides are emerging 2D materials with tunable properties. Their structural complexity and stability enable diverse applications in sensing and electronics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Emerging class of two-dimensional (2D) materials: noble-metal chalcogenides, dichalcogenides, and phosphochalcogenides.
  • Tunable properties via quantum confinement and defect engineering, including metal-to-semiconductor transitions, magnetic ordering, and topological surface states.
  • Diverse polytypes with similar formation energies accessible through selective synthesis.

Purpose of the Study:

  • Summarize recent progress in noble-metal chalcogenides and phosphochalcogenides.
  • Highlight the impact of structural complexity on material properties and applications.
  • Provide insights into the potential of these 2D materials.

Main Methods:

  • Literature review of recent advancements in the synthesis and characterization of these 2D materials.
  • Analysis of structure-property relationships.
  • Discussion of application-relevant properties.

Main Results:

  • Demonstrated tunability of electronic and magnetic properties.
  • Exhibited excellent mechanical, optical, and chemical sensing capabilities.
  • Showcased long-term air and moisture stability.

Conclusions:

  • Noble-metal chalcogenides and phosphochalcogenides are promising 2D materials with significant potential.
  • Structural complexity is a key factor in their diverse applications.
  • These materials offer a versatile platform for future technological advancements.