Page 69 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

F O R M U L A E IR-4.4

3. [Mo 6 O 18 ] 2
4. [CuSb 2 ] 5
5. [UO 2 ] 2þ
6. [SiW 12 O 40 ] 4
7. [BH 4 ]

8. [ClO 4 ] or ClO 4
9. [PtCl 2 {P(OEt) 3 } 2 ]
10. [Al(OH)(OH 2 ) 5 ] 2þ
11. [PtBrCl(NH 3 )(NO 2 )]

12. [PtCl 2 (NH 3 )(py)]
13. [Co(en)F 2 (NH 3 ) 2 ] , b ut [CoF 2 (NH 2 CH 2 CH 2 NH 2 )(NH 3 ) 2 ] þ
þ
14. [Co(NH 3 ) 5 (N 3 )] 2

In a f ew cases, a m oiety w hich comprises different atoms and which occurs i n a series of
compounds is considered as an entity t hat acts as a c entral atom and is cited as such, even if
this violates the alphabetical order of ligands. F or example, PO and UO 2 are regarded as
single entities in Examples 1 5 a nd 16.

Examples:
15. POBr 3 (alphabetically, P Br 3 O)
16. [UO 2 Cl 2 ] ( alphabetically, [UCl 2 O 2 ])

For derivatives of parent hydrides (see Chapter IR-6), the alphabetical order of ligands is
traditionally disobeyed in that remaining hydrogen atoms are listed first among the ligands
in the formula.

Examples:

17. GeH 2 F 2
18. SiH 2 BrCl
19. B 2 H 5 Cl

For carbaboranes, there has previously been some uncertainty over the order of B a nd C. 3
The order ‘B before C’ recommended here conforms to both electronegativity and
1
alphabetical order (i.e. i t i s a n e xception to the Hill order in Section IR-4.2.1). In addition,
carbon atoms that replace skeletal boron atoms are cited immediately after boron, regardless
of what o ther elements are present. (See also Section IR-6.2.4.4.)

Examples:
(recommended)
20. B 3 C 2 H 5
21. B 3 C 2 H 4 Br (recommended)

60