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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
Structural Isomerism02:34

Structural Isomerism

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 be...
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...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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...
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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...

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Discovery and Synthesis Optimization of Isoreticular Al(III) Phosphonate-Based Metal-Organic Framework Compounds Using High-Throughput Methods
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Discovery and Synthesis Optimization of Isoreticular Al(III) Phosphonate-Based Metal-Organic Framework Compounds Using High-Throughput Methods

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Interconvertable modular framework and layered lanthanide(III)-etidronic acid coordination polymers.

F N Shi1, L Cunha-Silva, R A Sa Ferreira

  • 1Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal.

Journal of the American Chemical Society
|December 14, 2007
PubMed
Summary
This summary is machine-generated.

New microporous and layered coordination polymers based on etidronic acid were synthesized. These materials exhibit zeolite-type behavior and tunable photoluminescence properties, with potential for interconversion between framework and layered structures.

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

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Discovery and Synthesis Optimization of Isoreticular Al(III) Phosphonate-Based Metal-Organic Framework Compounds Using High-Throughput Methods
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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Crystallography

Background:

  • Coordination polymers offer tunable structures and properties.
  • Microporous materials are crucial for separation and catalysis.
  • Lanthanide-based materials display unique photoluminescent characteristics.

Purpose of the Study:

  • To synthesize and structurally characterize novel isostructural modular microporous and layered coordination polymers.
  • To investigate the thermal stability and zeolite-type behavior of the framework materials.
  • To explore the photoluminescence properties and structural interconversion of these compounds.

Main Methods:

  • Hydrothermal synthesis
  • Single-crystal and powder X-ray diffraction
  • Solid-state NMR spectroscopy
  • Thermogravimetric analysis
  • Photoluminescence spectroscopy

Main Results:

  • Successful synthesis of framework-type Na2[Y(hedp)(H2O)0.67] and Na4[Ln2(hedp)2(H2O)2].nH2O, and layered coordination polymers [Eu(H2hedp)(H2O)2].H2O, Na0.9[Nd0.9Ge0.10(Hhedp)(H2O)2], [Ln(H2hedp)(H2O)].3H2O, and [Yb(H2hedp)].H2O.
  • Framework materials exhibit reversible water removal and retain structural integrity up to 475 °C, demonstrating zeolite-type behavior.
  • Photoluminescence properties of Eu-containing compounds are sensitive to hydration.
  • Interconversion between 3D framework and layered structures is achievable via controlled synthesis conditions (e.g., addition of HCl or NaCl).
  • A unique 2D water network based on a (H2O)13 cluster was observed in layered [Y(H2hedp)(H2O)].3H2O.

Conclusions:

  • Novel microporous and layered coordination polymers based on etidronic acid have been successfully synthesized and characterized.
  • The materials exhibit promising zeolite-type behavior and tunable photoluminescence, with potential applications in separation and sensing.
  • The observed structural interconversion highlights the versatility of hydrothermal synthesis for designing complex inorganic materials.