Page 65 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

F O R M U L A E IR-4.2

[rule (iv)]
6. Ca 3 (PO 4 ) 2
[rules (iii), (iv), (vi)]
7. [Co(NH 3 ) 6 ] 2 (SO 4 ) 3
8. [{Rh(m-Cl)(CO) 2 } 2 ] [ rules (iii), (vi), (vii)]
9. K[Os(N) 3 ] [ rules (ii), (iii)]
[rule (v)]
10. (–S)– n
11. (HBO 2 ) n , o r – (B(OH)O)– n [rules (ii) and (v)]
12.
Cl
Pd

Cl
n
13. Cl PPh 3
Ni
Cl PPh 3
14. NaCl

15. [NaCl]

The first formula in Example 11 may be considered to be a m olecular formula (Section
IR-4.2.2) with no implications about the structure of the polymer in question.
In Examples 1 4 a nd 15, the formula [ NaCl] may be used to distinguish the molecular
compound consisting of one sodium atom and one chlorine atom from the solid with the
composition NaCl.

IR-4.2.4 Formulae of (formal) addition compounds

In the formulae of addition compounds and compounds which can formally be regarded as
such, including clathrates and multiple salts, a s pecial format is used. The p roportions of
constituents are indicated by arabic numerals preceding the formulae of the constituents, and
the formulae of the constituents are separated by a c entre dot. The rules for ordering the
constituent f ormulae are described in Section IR-4.4.3.5.

Examples:
:
1. Na 2 CO 3 10H 2 O
:
2. 8H 2 S 46H 2 O
:
3. BMe 3 NH 3

IR-4.2.5 Solid state structural i nformation

Structural information can also be given b y i ndicating structural type as a q ualification of a
formula. For example, polymorphs may be indicated by adding in parentheses an abbreviated
expression for the crystal system (see Sections IR-11.5.2 and IR-11.7.2, and Table IR-3.1).
Structures may also be designated by adding the name o f a t ype-compound i n i talics in paren-
theses, but such usage may not be unambiguous. There are at least ten varieties o f Z nS(h).

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