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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

21.9K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Coordination Number and Geometry02:57

Coordination Number and Geometry

19.2K
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.
19.2K
Colors and Magnetism03:02

Colors and Magnetism

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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...
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Stereoisomerism02:52

Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
14.2K
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

27.2K
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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Valence Bond Theory02:42

Valence Bond Theory

11.4K
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...
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Facile Preparation of 4-Substituted Quinazoline Derivatives
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Two 8-Hydroxyquinolinate Based Supramolecular Coordination Compounds: Synthesis, Structures and Spectral Properties.

Chengfeng Zhu1, Yunfei Wang2, Qingqing Mao3

  • 1School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China. ZhuCF2016@126.com.

Materials (Basel, Switzerland)
|August 5, 2017
PubMed
Summary

New chromium(III) complexes with novel 8-hydroxyquinoline ligands were synthesized. These stable complexes exhibit altered UV-Vis and fluorescence properties, indicating their potential as heavy metal chelating agents for Cr³⁺.

Keywords:
8-hydroxyquinolinechromium (III) complexsupramolecular coordination compound

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • 8-hydroxyquinoline derivatives are versatile ligands in coordination chemistry.
  • Chromium(III) complexes have diverse applications, including catalysis and materials science.
  • Understanding supramolecular assembly is crucial for designing functional materials.

Purpose of the Study:

  • Synthesize and characterize new chromium(III) complexes with 2-substituted 8-hydroxyquinoline ligands.
  • Investigate the structural, thermal, and spectroscopic properties of the synthesized complexes.
  • Evaluate the potential of these ligands as heavy metal chelating agents for Cr³⁺.

Main Methods:

  • Facile hydrothermal synthesis of chromium(III) complexes.
  • Comprehensive characterization using single crystal X-ray diffraction, powder X-ray diffraction, FTIR, TGA, and ESI-MS.
  • Analysis of UV-Visible absorption and fluorescence emission spectra.

Main Results:

  • Two new Cr(III) complexes, [Cr(L₁)₃] and [Cr(L₂)₃], were successfully prepared.
  • Single crystal X-ray diffraction revealed 3D supramolecular architectures stabilized by various noncovalent interactions.
  • Thermogravimetric analysis and ESI-MS confirmed good thermal and solution stability.
  • Complexation with Cr(III) ion induced significant changes in the UV-Vis and fluorescence spectra of the ligands.

Conclusions:

  • The synthesized chromium(III) complexes exhibit robust 3D supramolecular structures.
  • The complexes demonstrate good stability, making them suitable for various applications.
  • The observed spectral changes highlight the potential of these 8-hydroxyquinolinate-based ligands as selective chelating agents for Cr³⁺.