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Na₃Co₂(AsO₄)(As₂O₇): a new sodium cobalt arsenate

Abderrahmen Guesmi1, Ahmed Driss

  • 1Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences, El Manar II, 2092 Tunis, Tunisia. abderrahmen.guesmi@ipeim.rnu.tn

Acta Crystallographica. Section E, Structure Reports Online
|July 19, 2012
PubMed

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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.
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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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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
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