Page 161 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

C O O R D I N A T I O N C O M P O U N D S IR-9.2

11. MeNH methylazanido, or methylamido, or methanaminido
(cf. E xample 3 o f S ection IR-6.4.6)

12. MePH 2 methylphosphane
13. MePH methylphosphanido

14. MeOS(O)OH m ethyl hydrogen sulfite
15. MeOS(O)O methyl sulfito, or methanolatodioxidosulfato(1 )

IR-9.2.2.4 Charge numbers, oxidation numbers and ionic proportions

The following methods can be used to assist in describing the composition of a c ompound:

(i) The oxidation number of the central atom in a c oordination entity m ay be indicated by
a R oman numeral appended in parentheses to the central atom name (including the
ending ‘ate’, if applicable), but only if the oxidation state can be defined without
ambiguity. When necessary a negative s ign is placed before the number. Arabic z ero
indicates the oxidation number zero.
(ii) Alternatively, the charge on a c oordination entity may be indicated. The n et charge
is written i n a rabic numbers, w ith the number preceding the charge sign, and enclosed
in parentheses. It follows the name o f t he central atom (including the ending ‘ate’, if
applicable) w ithout the intervention of a s pace.

(iii) The proportions of ionic entities i n a coordination compound may be given by using
multiplicative prefixes. (See Section IR-5.4.2.1.)

Examples:

1. K 4 [Fe(CN) 6 ]
potassium h exacyanidoferrate(II), or
potassium h exacyanidoferrate(4 ), or
tetrapotassium hexacyanidoferrate
2. [Co(NH 3 ) 6 ]Cl 3
hexaamminecobalt(III) chloride
3. [CoCl(NH 3 ) 5 ]Cl 2
pentaamminechloridocobalt(2þ) c hloride

4. [CoCl(NH 3 ) 4 (NO 2 )]Cl
tetraamminechloridonitrito-kN-cobalt(III) c hloride
5. [PtCl(NH 2 Me)(NH 3 ) 2 ]Cl
diamminechlorido(methanamine)platinum(II) chloride
6. [CuCl 2 {O¼C(NH 2 ) 2 } 2 ]
dichloridobis(urea)copper(II)
7. K 2 [PdCl 4 ]
potassium t etrachloridopalladate(II)

8. K 2 [OsCl 5 N]
potassium p entachloridonitridoosmate(2 )

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