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Related Concept Videos

Coordination Number and Geometry02:57

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Properties of Transition Metals02:58

Properties of Transition Metals

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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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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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The Nucleosome Core Particle02:10

The Nucleosome Core Particle

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Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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Microcrystalline Core-Shell Lanthanide-Based Coordination Polymers for Unprecedented Luminescent Properties.

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Synthesized core-shell lanthanide coordination polymers offer tunable luminescence. These materials enable efficient control over energy transfer between lanthanide ions for multi-region light emission.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Photophysics

Background:

  • Lanthanide-based coordination polymers are known for their unique luminescent properties.
  • Controlling energy transfer between lanthanide ions is crucial for advanced optical materials.
  • Existing heterolanthanide coordination polymers (

Purpose of the Study:

  • To synthesize and characterize microcrystalline core-shell lanthanide coordination polymers.
  • To investigate the luminescent and photophysical properties of these novel materials.
  • To demonstrate the potential for controlling intermetallic energy transfers and achieving multiemissive compounds.

Main Methods:

  • Synthesis of core-shell lanthanide coordination polymers using 1,4-carboxyphenylboronic acid (Hcpb).
  • Structural characterization of the synthesized powders.
  • Study of photophysical properties, including luminescence and energy transfer mechanisms.

Main Results:

  • Core-shell lanthanide coordination polymers with formula ([Ln(cpbOH)]∞)1-x@([Ln'(cpbOH)]∞)x were successfully synthesized and characterized.
  • Their luminescent properties differ significantly from heterolanthanide coordination polymers.
  • Efficient control over intermetallic energy transfers was achieved, enabling multiemissive compounds in visible and infrared regions.

Conclusions:

  • Core-shell lanthanide coordination polymers provide a platform for precise control of photophysical properties.
  • These materials are promising for developing tunable luminescent devices and sensors.
  • The study highlights the potential of lanthanide coordination compounds for 3D molecular epitaxial growth.