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Ch.12 - Solids and Modern Materials
Brown - Chemistry: The Central Science 14th Edition
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Tutti i libri di testoBrown 14th EditionCh.12 - Solids and Modern MaterialsProblema 66b
Capitolo 12, Problema 66b

The coordination number for the Al3+ ion is typically between four and six. Use the anion coordination number to determine the Al3 + coordination number in the following compounds: (b) Al2O3 where the oxygen ions are six coordinate.

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Identify the coordination number of the oxygen ions, which is given as six.
Understand that the coordination number of Al^{3+} will be determined by the number of oxygen ions it is bonded to.
In Al2O3, each Al^{3+} ion is surrounded by oxygen ions. Since the oxygen ions are six-coordinate, each oxygen is bonded to multiple Al^{3+} ions.
Calculate the total number of Al^{3+} ions that can coordinate with one oxygen ion, considering the stoichiometry of Al2O3.
Determine the coordination number of Al^{3+} by considering how many oxygen ions surround each Al^{3+} ion, ensuring the charge balance and stoichiometry are maintained.

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Coordination Number

The coordination number refers to the number of ligand atoms that are bonded to a central metal ion in a complex. It is a crucial concept in coordination chemistry, as it influences the geometry and stability of the complex. For example, a coordination number of six typically leads to an octahedral geometry, while four can lead to either tetrahedral or square planar arrangements.
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Coordination Numbers

Aluminum Ion (Al3+)

The aluminum ion, Al3+, is a common cation in coordination compounds, characterized by its +3 charge. This high charge density allows it to attract and coordinate with multiple anions or ligands. Understanding the properties of Al3+ is essential for predicting its behavior in various compounds, including its coordination number and the resulting structure.
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Ion Formation

Anion Coordination

Anion coordination refers to the arrangement and bonding of anions around a central cation in a compound. The coordination number of the anions can influence the overall structure and stability of the compound. In the case of Al2O3, where oxygen ions are six-coordinate, this indicates that each aluminum ion is surrounded by six oxygen ions, which helps determine the coordination number of the aluminum ions.
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Coordination Complexes Example
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Domanda del libro di testo

The coordination number for the Al3+ ion is typically between four and six. Use the anion coordination number to determine the Al3 + coordination number in the following compounds: (c) AlN where the nitride ions are four coordinate.

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Domanda del libro di testo

The coordination number for the Al3+ ion is typically between four and six. Use the anion coordination number to determine the Al3 + coordination number in the following compounds: (a) AlF3 where the fluoride ions are two coordinate.

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Domanda del libro di testo

CuI, CsI, and NaI each adopt a different type of structure. The three different structures are those shown in Figure 12.26. (a) Use ionic radii, Cs+ 1r = 1.81 A 2, Na+ 1r = 1.16 A 2, Cu+ 1r = 0.74 A 2, and, I- 1r = 2.06 A 2, to predict which compound will crystallize with which structure.

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