Page 114 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

IR-6.4 S U B S T I T U T I V E N O M E N C L A T U R E

4.

= N H 2

diboran(6)-m-amine

IR-6.4 N A M E S O F I O N S A N D R A D I C A L S D E R I V E D F R O M
P A R E N T H Y D R I D E S

This section p resents names of ions and radicals that can be formally derived from hydrides
by the operations of removal or addition of hydrogen atoms, hydride ions or hydrons. A
great many ions and radicals c an also be named by additive methods, a s d escribed in
Chapter I R-7. Many simple ions and radicals are named in Table IX, often by both
nomenclature types.

IR-6.4.1 Cations derived from parent hydrides b y a ddition of one or more hydrons

The name of an ion formally derived by adding a h ydron to a p arent hydride is obtained by
adding the suffix ‘ium’ to the name o f t he parent hydride, with elision of a fi nal ‘e’. For
polycations formed in this way, t he suffixes ‘diium’, ‘triium’, etc., a re used without elision
of any final ‘e’ on the parent hydride name. Any necessary l ocants are placed immediately
preceding the suffix. Locants for added hydrons t ake precedence over locants for
unsaturation, as in Example 8 b elow.
The alternative names ammonium, h ydrazinium, hydrazinediium and oxonium are used
for naming organic derivatives, see Section IR-6.4.3 and Section P-73.1 of Ref. 1.

Examples:

þ azanium, o r a mmonium
1. NH 4
þ
2. N 2 H 5 diazanium, or hydrazinium
2þ
3. N 2 H 6 diazanediium, or hydrazinediium
4. H 3 O þ oxidanium, or oxonium (not hydronium)
5. H 4 O 2þ oxidanediium
þ
6. H 3 O 2 dioxidanium
7. þ H 3 PPHPH 3 þ triphosphane-1,3-diium
8. þ H 3 NN¼NH triaz-2-en-1-ium

IR-6.4.2 Cations derived from parent hydrides b y l oss of one or more hydride ions
A c ation produced by formal loss of a h ydride ion from a p arent hydride is named by adding
the suffix ‘ylium’ to the parent n ame, with elision of a fi nal ‘e’. For polycations formed in

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