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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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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Structural Isomerism02:34

Structural Isomerism

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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,...
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Valence Bond Theory02:42

Valence Bond Theory

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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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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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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

4.1K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
4.1K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.5K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Compact Quantum Dots for Single-molecule Imaging
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Multistimuli-Responsive Hydrolytically Stable "Smart" Mercury(II) Coordination Polymer.

Sarita Tripathi1, Devjanee Bardhan1, Dillip K Chand1

  • 1Department of Chemistry , Indian Institute of Technology Madras , Chennai 600036 , India.

Inorganic Chemistry
|September 5, 2018
PubMed
Summary

A novel mercury(II) coordination polymer exhibits "turn-off" photoluminescence sensing for anions, solvents, and nitroaromatic compounds. This "smart" material demonstrates anion-exchange capabilities and selective detection of nitroaromatic isomers.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Chemical Sensing

Background:

  • Coordination polymers (CPs) are advanced materials with tunable properties.
  • Mercury(II) (Hg(II)) based CPs are of interest for their unique structural and photoluminescent characteristics.
  • Developing "smart" materials with multi-stimuli responsiveness is a key research area.

Purpose of the Study:

  • To synthesize and characterize a novel one-dimensional double chain Hg(II) coordination polymer.
  • To investigate the photoluminescent properties and sensing capabilities of the synthesized CP.
  • To explore the material's potential for detecting various analytes including anions, solvents, and nitroaromatic compounds.

Main Methods:

  • Synthesis of a Hg(II) coordination polymer using a benzimidazole-appended tripodal tridentate ligand.
  • Characterization of the CP's structure and photoluminescent properties.
  • Investigation of luminescence quenching responses to different stimuli and anion-exchange experiments.

Main Results:

  • A new Hg(II) CP, {[Hg(L)2]·(ClO4)2}n, was successfully synthesized.
  • The CP exhibits multi-stimuli-responsive photoluminescence with a
  • turn-off
  • sensing mechanism.
  • The material demonstrated reversible and irreversible anion-exchange properties.
  • Selective fluorescence-based detection of nitroaromatic compounds, including discrimination of isomers, was achieved with high sensitivity and stability.

Conclusions:

  • The synthesized Hg(II) CP is a novel "smart" material with dynamic and flexible framework.
  • It possesses excellent photoluminescent sensing capabilities for anions, solvents, and nitroaromatic compounds.
  • The material shows promise as a highly selective and recyclable fluorescent probe for environmental monitoring and chemical sensing applications.