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Related Concept Videos

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...
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To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
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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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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K(0.12)Na(0.54)Ag(0.34)Nb(4)O(9)AsO(4).

Saïda Fatma Chérif1, Mohamed Faouzi Zid, Ahmed Driss

  • 1Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 Manar II Tunis, Tunisia.

Acta Crystallographica. Section E, Structure Reports Online
|April 28, 2011
PubMed
Summary

Researchers synthesized a novel potassium sodium silver niobium arsenate compound, K(0.12)Na(0.54)Ag(0.34)Nb(4)AsO(13), featuring a unique 3D framework with ion-filled tunnels. This discovery advances solid-state chemistry and materials science.

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Area of Science:

  • Solid-state chemistry
  • Inorganic materials science
  • Crystallography

Background:

  • The synthesis and characterization of novel inorganic compounds with complex structures are crucial for developing new materials.
  • Three-dimensional frameworks with ion-conducting channels are of interest for various applications.

Purpose of the Study:

  • To synthesize and characterize a new potassium sodium silver niobium arsenate compound.
  • To investigate the crystal structure and ion site occupancy of the synthesized material.

Main Methods:

  • Solid-state reaction synthesis at 1123 K.
  • X-ray crystallography for structure determination.

Main Results:

  • A novel compound, potassium sodium silver tetra-niobium nona-oxide arsenate (K(0.12)Na(0.54)Ag(0.34)Nb(4)AsO(13)), was successfully synthesized.
  • The compound adopts a three-dimensional framework with tunnels along [001].
  • Sodium, silver, and potassium ions are located in these tunnels in an occupationally disordered manner.

Conclusions:

  • The synthesized compound exhibits a unique crystal structure with potential for ion transport.
  • The study provides insights into the structural complexity and ion distribution in mixed-metal arsenates.