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Related Concept Videos

Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Coordination Number and Geometry02:57

Coordination Number and Geometry

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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Related Experiment Video

Updated: Jun 1, 2026

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
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Published on: December 27, 2018

A precise hexagonal octadecanuclear Ag macrocycle with significant luminescent properties.

Jin Jin1, Weiyin Wang, Yanhua Liu

  • 1Department of Chemistry, Zhengzhou University, Henan 450052, PR China.

Chemical Communications (Cambridge, England)
|June 2, 2011
PubMed
Summary
This summary is machine-generated.

Researchers synthesized the first hexagonal octadecanuclear silver macrocycle, [Ag(18)(TTTMB)(12)](NO3)18·30H2O. This novel silver complex exhibits enhanced phosphorescence intensity and lifetime at lower temperatures.

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Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Metal-organic frameworks (MOFs) and coordination polymers are crucial in materials science.
  • Exploring novel macrocyclic structures with unique properties is an ongoing research area.
  • Silver-based macrocycles offer potential for diverse applications due to silver's unique electronic properties.

Purpose of the Study:

  • To synthesize and characterize a novel hexagonal octadecanuclear silver macrocycle.
  • To investigate the structural properties of the synthesized silver complex.
  • To explore the photoluminescent behavior, specifically phosphorescence, of the new macrocycle.

Main Methods:

  • Hydrothermal synthesis was employed for the preparation of the silver macrocycle.
  • Single-crystal X-ray diffraction was used to determine the precise molecular structure and dimensions.
  • Photoluminescence spectroscopy was utilized to study the phosphorescence properties at varying temperatures.

Main Results:

  • The first hexagonal octadecanuclear silver macrocycle, [Ag(18)(TTTMB)(12)](NO3)18·30H2O, was successfully synthesized.
  • The macrocycle exhibits distinct dimensions with an outer diameter of approximately 27.72 Å and an inner diameter of 15.37 Å.
  • A significant enhancement in phosphorescence intensity and lifetime was observed as the temperature decreased.

Conclusions:

  • The successful synthesis of this unprecedented silver macrocycle expands the library of complex coordination structures.
  • The observed temperature-dependent phosphorescence suggests potential applications in sensing or optical devices.
  • Further studies are warranted to explore the specific mechanisms behind the enhanced luminescence and potential uses.