Page 29 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

G R A M M A R I R-2.2

(Compare with the use of parentheses for isotopically s ubstituted compounds in Section
IR-2.2.3.2, and also see Sections II-2.4.2.3, I I-2.4.2.4 and II-2.4.3.3 of Ref. 2.)

Examples:
2
15
15
2
1. [ N]H 2 [ H] [ H 1 , N]ammonia
2. HO[ O]H 18 d ihydrogen [ 18 O 1 ]peroxide
For more d etails, see Section II-2.4 of Ref. 2.
(b) When naming organic ligands and organic parts of coordination compounds the use of
square brackets o beys the principles o f o rganic nomenclature. 1

Example:
3.
Cl 3+

H N H N N H
Co

H N H N N H

Cl

1,8-dichloro-3,6,10,13,16,19-hexaazabicyclo[6.6.6]icosanecobalt(3þ)

(c) In chain and ring n omenclature, square brackets a re used to enclose the nodal descriptor
(Section IR-7.4.2 and Chapter II-5 of Ref. 2).

Examples:

4. HSSH * 1,4-dihydrony-2,3-disulfy-[4]catenate( * 1 )
5.
S 1 S
S 12 N S
S 13 S S 4
S N S
S 7 S
1,7
1,7-diazyundecasulfy-[012.1 ]dicycle
IR-2.2.3 Parentheses

IR-2.2.3.1 Use in formulae
Parentheses are used in formulae in the following ways.

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