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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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.
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The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
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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...

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Heterometallic Werner complexes as energetic materials.

Caroline Pradère1, Samuel Suhard, Laure Vendier

  • 1Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse, France.

Dalton Transactions (Cambridge, England : 2003)
|August 9, 2008
PubMed
Summary

New cobalt-based heterometallic Werner complexes were synthesized. These energetic materials exhibit good oxygen balance and are suitable for automotive applications.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Werner complexes are coordination compounds with a central metal atom bonded to ligands.
  • Heterometallic complexes contain more than one type of metal atom.
  • Energetic materials are chemical substances that release energy when undergoing a chemical transformation.

Purpose of the Study:

  • To synthesize novel heterometallic Werner complexes.
  • To investigate the coordination chemistry of nitrate ligands.
  • To evaluate the energetic properties and suitability for automotive applications.

Main Methods:

  • Synthesis of heterometallic Werner complexes using cobalt(III) hexammine and various metal nitrate or metal oxide precursors.
  • Utilized organic and aqueous synthetic routes.
  • Characterization using X-ray diffraction and thermal analysis (TDA-TGA).

Main Results:

  • Successfully synthesized new heterometallic Werner complexes of the type [Co(NH3)6]x[M(NO3)4]3 and X2MO4.
  • X-ray data revealed the versatile coordination modes of nitrate ligands in manganese and copper precursors.
  • Thermal analysis confirmed the energetic material characteristics.

Conclusions:

  • The synthesized [Co(NH3)6]x[M(NO3)4]3 complexes possess a favorable oxygen balance.
  • Standard sensitivity tests indicate their potential suitability for automotive applications.