Page 80 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

T A B L E I I I T A B L E S

Table III Continued

Ending of certain non-systematic names of oxidometal cations, e.g. vanadyl for
oxidovanadium(2þ). These names are no longer acceptable.
ylene Ending of a f ew still acceptable names for divalent substituent groups, meaning the
same as ‘diyl’: methylene for methanediyl, CH 2 ; p henylene for benzenediyl, C 6 H 4 ;
(1,2-phenylene for benzene-1,2-diyl etc.).
ylidene Suffix for names of divalent substituent groups formed by the loss of two hydrogen atoms
from the same atom of a p arent hydride and forming a d ouble bond, e.g. azanylidene,
HN¼ , a nd for names of corresponding diradicals. (See also ‘diyl’.)
ylidyne Suffix for names of trivalent substituent groups formed by the loss of three hydrogen atoms
from the same atom of a p arent hydride and forming a t riple bond, e.g. phosphanylidyne,
P . ( See also ‘ylylidene’ and ‘triyl’.)
ylium Suffix for names of cations formed by the loss of hydride ions from parent hydrides,
þ
accompanied by locants and multiplicative prefixes as appropriate, e.g. azanylium, NH 2 ;
þ
þ
disilane-1,2-diylium, H 2 SiSiH 2 .
ylylidene Combined suffix (‘yl’ plus ‘ylidene’) for names of trivalent substituent groups formed by
the loss of three hydrogen atoms from the same atom, forming a s ingle bond and a d ouble
bond, e.g. azanylylidene, N¼ . ( See also ‘ylidyne’ and ‘triyl’.)
yne Ending of systematic names of acyclic and cyclic parent structures with triple-bond
unsaturation, replacing ‘ane’ in the name of the corresponding saturated parent hydride,
and if necessary accompanied by locants and multiplicative prefixes specifying the
locations and number of triple bonds, e.g. diazyne (see ‘ynium’ for an application of this
name), ethyne, penta-1,4-diyne.
ynide Combined ending of names of anions resulting from the removal of a h ydron from a p arent
hydride with an ‘yne’ name, formed by adding the suffix ‘ide’, e.g. ethynide, CH C . Cf.

Section IR-6.4.4.
ynium Combined ending of names of cations resulting from the addition of a h ydron to a p arent
structure with an ‘yne’ name, formed by adding the suffix ‘ium’, e.g. diazynium
þ
(N NH ). Cf. S ection IR-6.4.1.
a
The term ‘suffix’ is understood here to mean a n ame part added to a p arent name in order to specify a
modification of that parent, e.g. substitution of a h ydrogen atom in a p arent hydride by a c haracteristic
group (suffixes such as ‘carboxylic acid’, ‘thiol’, etc.) o r f ormation of a r adical or substituent group by
removal of one or more hydrogen atoms (suffixes such as ‘yl’, ‘ylidene’, etc.). The term ‘ending’ is
used in a b roader sense, but also to designate specifically the common last part (last syllable or last few
syllables) of systematic names for members of classes of compounds (such as ‘ane’, ‘ene’, ‘diene’,
‘yne’, etc., f or parent hydrides, and ‘onic acid’, ‘inic acid’, etc., f or inorganic oxoacids).
b
Nomenclature of Organic Chemistry, IUPAC Recommendations, e ds. W.H. Powell and H. Favre,
Royal Society of Chemistry, in preparation. (The Blue Book.)

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