Ionic compounds giant structure

The hundreds of ions holding each other together make ionic compounds giant structures, but the ratio of the positive to negative ions is always the same, e.g. one Na+ to every one Cl (Figure 7.3). 

There are three types of giant structure - ionic, metallic and macromolecular. a Sodium nitride is an ionic compound. Draw a diagram that shows the formula of the compound, the charges on the ions and the arrangement of the valency electrons around the negative ion. 

Since ionic compounds exist as giant ionic structures (Chapter 4) the concept of a molecule cannot be applied. The formula of an ionic compound is therefore an empirical formula, representing the ions present in their simplest ratio. 

Ionic compounds such as sodium chloride and magnesium oxide form a giant three-dimensional lattice structure containing ions in a regularly repeating pattern. 

The elements sodium and chlorine react together to form the compound sodium chloride, which has a giant ionic lattice structure. 

Ionic lattices have a three-dimensional arrangement of alternating positive and negative ions. Compounds with ionic lattices are sometimes called giant ionic structures. 

Detailed discussions on supramolecular structures of giant polyoxometalate clusters have been reported by Muller and co-workers." " The number of ionic lattices formed from anionic POM clusters and organic cations-coordination complex cations resulting in supramolecular structures is substantial and literally more than hundreds of new compounds in this class appear annuallyIn this overview, the supramolecular features of POM-based systems will be discussed mainly under three headings (a) supramolecular features of polyoxometalate supported transition metal complexes, (b) polyoxometalate-crown ether complexes with supramolecular cations, and (c) supramolecular water clusters associated with polyoxometalates. 

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