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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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Emission Spectra02:39

Emission Spectra

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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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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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Lattice Centering and Coordination Number02:33

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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.
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Understanding the motion of particles is a fundamental aspect of classical mechanics, and the choice of the coordinate system plays a pivotal role in unraveling the complexities of their dynamics.
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Spherical coordinate systems are preferred over Cartesian, polar, or cylindrical coordinates for systems with spherical symmetry. For example, to describe the surface of a sphere, Cartesian coordinates require all three coordinates. On the other hand, the spherical coordinate system requires only one parameter: the sphere's radius. As a result, the complicated mathematical calculations become simple. Spherical coordinates are used in science and engineering applications like electric and...
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Characterization of Thermal Transport in One-dimensional Solid Materials
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Matrix Coordination Induced Emission in a Three-Dimensional Silver Cluster-Assembled Material.

Zhong Wei1, Xiao-Hui Wu1, Peng Luo1

  • 1College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 12, 2018
PubMed
Summary

Researchers developed a novel silver cluster-assembled material (SCAM) that enhances the luminescence of aggregation-caused quenching (ACQ) molecules. This stable material shows promise for improving light emission in aggregated states.

Keywords:
aggregationcluster compoundsluminescencesilver

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Luminescence

Background:

  • Developing stable and luminescent silver cluster-assembled materials (SCAMs) is challenging due to the instability of silver clusters and poor luminescence of some organic molecules.
  • Aggregation-caused quenching (ACQ) is a phenomenon where luminescence decreases in the aggregated state, limiting applications.

Purpose of the Study:

  • To design and synthesize a novel 3D SCAM incorporating a rigid ligand and silver clusters.
  • To enhance the luminescence of an ACQ molecule (CPPP) within a stable framework.
  • To investigate the matrix coordination induced emission (MCIE) effect in the new material.

Main Methods:

  • Synthesis of a new 3D SCAM, Ag12 CPPP, using a quadridentate rigid emission ligand (CPPP) and a silver-chalcogenolate cluster (SCC) with 12 AgI atoms.
  • Luminescence studies to analyze the properties of CPPP in solution, solid state, and within the Ag12 CPPP framework.
  • Characterization of the material's structure and luminescence behavior.

Main Results:

  • The synthesized Ag12 CPPP material effectively immobilizes the CPPP ligand, overcoming its aggregation-caused quenching (ACQ) behavior.
  • The quantum yield of CPPP was significantly enhanced within the Ag12 CPPP framework compared to its isolated states.
  • The material exhibited a clear matrix coordination induced emission (MCIE) effect.

Conclusions:

  • The rigid framework of Ag12 CPPP enhances the luminescence of ACQ molecules by preventing aggregation.
  • This rigidifying methodology offers a promising strategy for improving the luminescence of ACQ molecules in aggregated states.
  • The study demonstrates a successful approach to stabilize unstable silver clusters within a luminescent material.