Page 71 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

F O R M U L A E IR-4.4

3. FeO(OH)
4. NaTl(NO 3 ) 2
5. Li[H 2 PO 4 ]
6. NaNH 4 [HPO 4 ]
7. Na[HPHO 3 ]

8. CuK 5 Sb 2 or K 5 CuSb 2
9. K 5 [CuSb 2 ]
10. H[AuCl 4 ]

11. Na(UO 2 ) 3 [Zn(H 2 O) 6 ](O 2 CMe) 9

The first formula in Example 8 w as arrived at by considering K a nd Cu to be electropositive
constituents and Sb to be electronegative, the second by considering K t o b e e lectropositive
and Cu and Sb to be electronegative. No structural information is conveyed by these
formulae. The f ormula i n E xample 9, on the other h and, implies the presence of the
5
coordination entity [CuSb 2 ] .
Deviation from alphabetical order of constituents in the same class is allowed to
emphasize similarities between c ompounds.

Example:

12. CaTiO 3 and ZnTiO 3 (rather t han TiZnO 3 )

Some generalized salts may also be treated as addition compounds, see Section IR-4.4.3.5.

IR-4.4.3.5 (Formal) a ddition compounds

In the formulae of addition compounds or compounds which can formally be regarded as
such, including clathrates and multiple salts, the formulae of the component molecules or
entities a re cited in order of increasing number; if they occur in equal numbers, t hey are
cited in alphabetical order in the sense of Section IR-4.4.2.2. In addition compounds
containing water, the water remains conventionally cited last. However, component boron
compounds are no longer treated as exceptions.

Examples:
:
1. 3CdSO 4 8H 2 O
:
2. Na 2 CO 3 10H 2 O
:
:
3. Al 2 (SO 4 ) 3 K 2 SO 4 24H 2 O
:
4. AlCl 3 4EtOH
:
5. 8H 2 S 46H 2 O
: :
6. C 6 H 6 NH 3 Ni(CN) 2
:
7. BF 3 2H 2 O
:
8. BF 3 2MeOH

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