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Related Concept Videos

Alkali Metals03:06

Alkali Metals

24.8K
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
24.8K
Emission Spectra02:39

Emission Spectra

76.4K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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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

24.3K
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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Ions as Acids and Bases02:54

Ions as Acids and Bases

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Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
26.5K

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Erbium(iii)-based metal-organic frameworks with tunable upconversion emissions.

Mengxue Li1, Salma Gul, Dan Tian

  • 1Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China. iamlsyin@njtech.edu.cn iamlhuang@njtech.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|August 31, 2018
PubMed
Summary

Researchers developed lanthanide-based metal-organic frameworks (Ln-MOFs) with tunable upconversion emissions. These Yttrium-based MOFs (Y-MOFs) doped with Ytterbium/Erbium ions show promising luminescence for advanced applications.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Nanotechnology

Background:

  • Lanthanide-based metal-organic frameworks (Ln-MOFs) are advanced materials with unique optical properties.
  • Upconversion luminescence (UCL) in Ln-MOFs offers potential for various applications, but achieving tunable and efficient emission remains a challenge.

Purpose of the Study:

  • To synthesize and characterize novel Ln-MOFs with enhanced and tunable upconversion emissions.
  • To investigate the influence of Ytterbium (Yb3+) and Erbium (Er3+) ion concentrations on UCL properties.
  • To elucidate the mechanism underlying the upconversion process in these materials.

Main Methods:

  • Synthesis of Yttrium-based metal-organic frameworks (Y-MOFs) co-doped with Yb3+ and Er3+ ions.
  • Characterization of the synthesized materials using appropriate analytical techniques.
  • Measurement of upconversion emission spectra under 980 nm laser excitation.

Main Results:

  • Successfully prepared Ln-MOFs exhibiting characteristic upconversion emissions at 520, 545, and 658 nm.
  • Demonstrated that emission intensities are tunable by varying Yb3+/Er3+ concentrations.
  • Identified an excited state absorption mechanism as the primary pathway for upconversion in Y-MOF:Yb/Er.

Conclusions:

  • A novel design principle for preparing luminescent Ln-MOF materials has been established.
  • The synthesized Y-MOF:Yb/Er materials offer a promising platform for tunable upconversion luminescence.
  • This research provides an experimental basis for the development of advanced luminescent Ln-MOF applications.