Anion names coordination compounds

A complex may be ionic or neutral. An ionic complex is called a complex ion. A neutral complex is a type of coordination compound. The only difference in naming coordination compounds or complex ions is that anionic complex ions have an ate suffix. 

This system is additive and was developed originally to name coordination compounds, although it can be used in other circumstances when appropriate. For a discussion, see the Nomenclature of Inorganic Chemistry, Chapter 10. The compound to be named is considered as a central atom together with its ligands, and the name is developed by assembling the individual names of the constituents. This system has also been applied to name oxoacids and the related anions. Coordination names for oxoanions are cited in the examples throughout the text, and they are presented in detail in Section 4.4.5 (p. 69). 

The names of heteroatomic electronegative constituents generally take the anion ending -ate, which is also characteristic of the names of anions of oxoacids (sulfate, phosphate, nitrate, etc.). Many such anions are coordination compounds, and these names are assembled using the rules of coordination nomenclature (see Section 4.4, p. 51). 

The names of anions usually end in -ide if there are monatomic or homopolyatomic, or -ate for heteropolyatomic anions and coordination compounds. Anionic ligands usually end in -o. Thus CP is chloride, I3 is triiodide and S042 is sulfate but become, chloro, triiodo and sulfato if they are coordinated as ligands. The names of complex anions are not always derived from the familiar name... 

Strategy We follow the preceding procedure for naming coordination compounds and refer to Tables 22.4 and 22.5 for names of ligands and anions containing metal atoms. 

To name coordination compounds, you follow a series of general rules based on the system originally proposed by Werner. As with all salts (see Section 3.5), the name of the cation goes before the name of the anion. 

In naming coordination compounds, we use the name of the cation followed by the name of the anion. To name a complex ion we use the guidelines outlined in Section 24.3. 

Coordination compounds are named in much the same way as simple ionic compounds. The cation is named first, followed by the anion. Examples include... 

The name of a coordination compound (as distinct from a complex cation or anion) is built in the same way as that of a simple compound, with the cation named before the anion ... 

The structure of NaCl, table salt, rock salt, or halite (name of the mineral) is the most important and most common one for MX-type salts. Hundreds of salts have this structure, and many examples are listed in Table 5.1. It is characteristic of ionic MX-type compounds except for those with large differences in sizes of cations and anions. The coordination number (CN) is six for both ions for NaCl. Large cations, particularly with small anions, prefer a larger CN, commonly CN = 8 as in the CsCl structure. Small cations, and particularly for compounds with significant covalent character, prefer the CN = 4 as in ZnS. 

In naming a coordination compound, the cation is named first followed by the name of the anion. One or both of these ions may be complex ions. 

Charge transfer band absorption occurs whenever inter- or intramolecular complexes between donor and acceptor are formed. In these complexes, anions may be, among the most effective donors. When an ion pair shows such an absorption band, the electronic transition is named ion-pair charge-transfer (IPCT). Ion pairs of coordination compounds are often concerned by IPCT and... 

In formulae and names of salts, double salts and coordination compounds, cations precede anions. Ordering within each of these groups is alphabetical, cf. Section IR-2.15.2. 

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