Page 143 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

I N O R G A N I C A C I D S A N D D E R I V A T I V E S IR-8.4

6. The related compound, catena-triphosphoric acid
O O O
HO P O P O P OH

OH OH OH
H 5 P 3 O 10
may be named as a t rinuclear coordination entity:
2
2
2
2
pentahydroxido-1k O,2k O,3kO-di-m-oxido-1:3k O;2:3k O-trioxido-
1kO,2kO,3kO-triphosphorus,
or as a s ymmetrical dinuclear coordination entity w ith a b ridging p hosphate ligand:
m-(hydroxidotrioxido-1kO,2kO -phosphato)-bis(dihydroxidooxidophosphorus),
0
or as a m ononuclear coordination entity with two phosphate ligands:
bis(dihydroxidodioxidophosphato)hydroxidooxidophosphorus,
or as a s even-membered c hain w ith ligands:
1,7-dihydrido-2,4,6-trihydroxido-2,4,6-trioxido-1,3,5,7-tetraoxy-
2,4,6-triphosphy-[7]catena.

All inorganic o xoacids for which a c ommon name c ontaining the word ‘ acid’ is still
acceptable according to the present recommendations are listed in Table IR-8.1 together
with additive names to illustrate how s ystematic names may be given.
Several names omitted from Ref. 2, e.g. selenic acid and hypobromous acid, are
reinstated because they are unambiguous and remain in common use (including their use as
parent names in functional replacement nomenclature, see Section IR-8.6).
Table IR-8.1 also includes a nions derived from the neutral oxoacids by successive
dehydronation.Manyofthese a nions alsohavecommonnamesthat arestill acceptable, i n s ome
cases in spite of the fact that they are based on nomenclature principles that are now otherwise
abandoned (e.g. nitrate/nitrite and perchlorate/chlorate/chlorite/hypochlorite). For names
involving the prefix ‘hydrogen’, s ee Sections IR-8.4 and IR-8.5.
It is important to note that the presence of a s pecies in Table IR-8.1 does not imply that it
has been described in the literature or that there has been a n eed to name i t i n t he past.
Several names are included only for completeness and to make parent names available for
naming organic derivatives.

IR-8.4 H Y D R O G E N N A M E S

An alternative n omenclature for h ydrogen-containing c ompounds and i ons i s d escribed here. The
word ‘hydrogen’, w ith a m ultiplicative prefix i f r elevant, i s j oined ( with no space) to an anion
name formed by additive nomenclature and p laced within appropriate enclosing marks ( see
SectionIR-2.2).Thisconstruction i s f ollowed ( again w ithnospace)bya c harge n umber i ndicating
the t otal charge of the s pecies or structural unit being n amed (except for n eutral species/units).
Hydrogen names are useful when the connectivity (the positions of attachment of the
hydrons) in a h ydron-containing compound or ion is unknown o r n ot specified (i.e. when
which of two or more t automers is not specified, or when one does not wish to specify
a c omplex connectivity, such as in network c ompounds).

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