Page 119 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

S U B S T I T U T I V E N O M E N C L A T U R E IR-6.5

The order is:
cation 5 anion 5 radical
in the sense that:

(i) the suffixes indicating these m odifications are cited in that order;
(ii) the lowest locants are given to positions where hydrogen atoms have been removed, i f
any; anion s ites, if any, are numbered u sing t he next lowest locants; finally, any
cationic sites are numbered. All these take precedence o ver unsaturation and over
substituents cited by prefixes.

Examples:
1. H 2 Te * þ tellaniumyl
2. H 2 Te * tellanuidyl

3.
2 1
þ

Me 3 N N Me 1,2,2,2-tetramethyldiazan-2-ium-1-ide
4.
3 2 1

MeN¼N *þ N SiMe 3 3-methyl-1-(trimethylsilyl)triaz-2-en-2-ium-1-id-2-yl
Further complications arise if one wishes to name a s ubstituent g roup containing a r adical
centre (see Section P-71.5 of Ref. 1).

IR-6.5 R E F E R E N C E S

1. Nomenclature of Organic Chemistry, IUPAC R ecommendations, e ds. W.H. P owell and
H. Favre, R oyal Society of Chemistry, in preparation.
2. K. Wade, Adv. Inorg. Chem. Radiochem., 18, 1 –66 (1976); R.E. Williams, Adv. Inorg.
Chem. Radiochem., 18, 6 7–142 (1976); D.M.P. Mingos, Acc. Chem. Res., 17, 3 11–319
(1984).
3. R.W. Rudolph and W.R. Pretzer, Inorg. Chem., 11, 1 974–1978 ( 1972); R .W. Rudolph,
Acc. Chem. Res., 9, 4 46–452 ( 1976).

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