Page 33 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

G R A M M A R I R-2.3

11. (þ) 589 -[Co(en) 3 ]Cl 3 (þ) 589 -tris(ethane-1,2-diamine)cobalt(III) trichloride
12.
1 2 3 4 5
ð2R; 3SÞ-ClSiH 2 SiHClSiHClSiH 2 SiH 3
(2R,3S)-1,2,3-trichloropentasilane

(h) In isotopically s ubstituted compounds, the appropriate nuclide symbol(s) is placed
in parentheses before the name of the part of the compound that is isotopically substituted
(see Section II-2.3.3 of Ref. 2). Compare with the use of square brackets f or specifically and
selectively labelled compounds in Section IR-2.2.2.2(a).

Example:
3
3
13. H HO ( H 1 )water
(i) To enclose the number of hydrogen atoms in boron compounds.

Example:
hexaborane(10)
14. B 6 H 10
(j) In hydrogen names (Section IR-8.4), to enclose the part of the name following the word
hydrogen.

Example:

15. [HMo 6 O 19 ] hydrogen(nonadecaoxidohexamolybdate)(1 )

IR-2.2.4 Braces
Braces a re used in names and formulae within t he hierarchical sequence outlined and
exemplified in Section IR-2.2.1.

IR-2.3 H Y P H E N S , P L U S A N D M I N U S S I G N S , ‘ E M ’ D A S H E S
A N D B O N D I N D I C A T O R S

IR-2.3.1 Hyphens

Hyphens are used in formulae and in names. N ote that there is no space on either side of
a h yphen.

(a) To separate symbols such as m (mu), Z (eta) and k (kappa) from the rest of the formula
or name.

Example:
1. [{Cr(NH 3 ) 5 } 2 (m-OH)] 5þ m-hydroxido-bis(pentaamminechromium)(5þ)

(b) To separate geometrical or structural and stereochemical designators such as cyclo,
catena, triangulo, quadro, tetrahedro, octahedro, c loso, nido, arachno, cis and trans from

24