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Related Concept Videos

Metallic Solids02:37

Metallic Solids

20.5K
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....
20.5K
Bonding in Metals02:32

Bonding in Metals

52.1K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Alkali Metals03:06

Alkali Metals

24.2K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
24.2K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

24.1K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
24.1K
Properties of Transition Metals02:58

Properties of Transition Metals

29.7K
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.
29.7K
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
5.8K

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Atomically Thin Metal Sulfides.

Lenore Kubie1, Marissa S Martinez1,2, Elisa M Miller1

  • 1Chemistry and Nanoscience Center , National Renewable Energy Laboratory , Golden , Colorado 80401 , United States.

Journal of the American Chemical Society
|July 6, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method for synthesizing atomically thin metal sulfides (ATMS) using cation exchange. These novel 2D materials exhibit unique optical properties distinct from conventional forms.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Chemistry

Background:

  • Atomically thin materials are typically layered structures like MoS2 and graphene.
  • Non-layered bulk materials lack established methods for producing 2D forms.

Purpose of the Study:

  • To develop a colloidal synthesis method for non-layered atomically thin metal sulfides (ATMS).
  • To explore the properties of these novel 2D materials.

Main Methods:

  • Colloidal synthesis via cation-exchange reactions.
  • Utilizing single- and multi-layer silver sulfide (Ag2S) as precursors.
  • Stabilization of synthesized ATMS using Z- and L-type ligands.

Main Results:

  • Successfully synthesized single- and few-layer ZnS, CdS, CoS2, and PbS via cation exchange.
  • Synthesized ATMS maintain size and shape, with lateral dimensions of 5-10 nm.
  • Observed distinct optical properties in synthesized ATMS compared to platelet or quantum-dot forms.

Conclusions:

  • The cation-exchange method enables the production of non-layered ATMS.
  • These novel 2D materials offer unique optical characteristics for potential applications.
  • The synthesis approach expands the library of accessible 2D materials beyond traditional layered compounds.