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Alkali Metals03:06

Alkali Metals

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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
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Bonding in Metals02:32

Bonding in Metals

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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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Metallic Solids02:37

Metallic Solids

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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....
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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...
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Properties of Transition Metals02:58

Properties of Transition Metals

29.9K
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.
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Acid–Base Equilibria: Activity-Based Definition of pH01:10

Acid–Base Equilibria: Activity-Based Definition of pH

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For an ideal solution, the pH is defined as the negative logarithm of the hydrogen ion concentration. For a non-ideal solution, an accurate measurement of the pH must consider the negative logarithm of the hydrogen ion activity rather than concentration. In such a solution, the pH can be more accurately defined as the negative logarithm of a product of the hydrogen ion concentration and its activity coefficient.
In solutions of very low ionic strength—for example, pure water—the...
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Modular O2 electroreduction activity in triphenylene-based metal-organic frameworks.

Elise M Miner1, Lu Wang1,2, Mircea Dincă1

  • 1Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , USA .

Chemical Science
|August 21, 2018
PubMed
Summary
This summary is machine-generated.

Hexasubstituted triphenylene ligands form electrically conductive layered two-dimensional metal-organic frameworks (MOFs). π-stacking within MOF layers is crucial for high electrical, redox, and catalytic activity, irrespective of the metal used.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Two-dimensional metal-organic frameworks (MOFs) are emerging materials with tunable properties.
  • Triphenylene-based ligands offer unique structural and electronic characteristics for MOF construction.

Purpose of the Study:

  • To synthesize and characterize novel layered two-dimensional MOFs using hexasubstituted triphenylene ligands.
  • To investigate the relationship between MOF structure, π-stacking, and electrical/catalytic properties.

Main Methods:

  • Synthesis of triphenylene ligands with amino or phenol groups.
  • Reaction of ligands with various metal ions to form MOFs.
  • Characterization of MOF structure and properties using techniques like X-ray diffraction and conductivity measurements.

Main Results:

  • Formation of two distinct phases of electrically conductive layered 2D MOFs.
  • Demonstration that π-stacking within MOF layers is essential for high electrical conductivity.
  • Observation of significant redox and catalytic activity correlated with π-stacking.

Conclusions:

  • Hexasubstituted triphenylene ligands are effective building blocks for conductive 2D MOFs.
  • Interlayer π-stacking is a critical design principle for optimizing MOF conductivity and functionality.
  • These MOFs show promise for applications in electronics and catalysis.