Page 21 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

C O O R D I N A T I O N C O M P O U N D S IR-9.5

Example:
11.
3−
1' 1" O
1 CH 2
O
1 1' Ho O
O
CH 2
1" O 3

IR-9.4 F I N A L R E M A R K S

This chapter has described the means by which coordination compounds can be named and
formulated. These processes i nvolve firstly identifying the central atom(s) and ligands (by
name, formula or abbreviation, depending on the context), and secondly defining the nature
of the attachment between t he central atom(s) and the ligands. T his l atter step requires t hat
the coordinating atoms in the ligand be identified (if there is any ambiguity), and that the
spatial r elationships between t he ligands be described. The s patial relationships between t he
ligands are defined in terms of the coordination polyhedron (giving the polyhedral symbol)
and the CIP priorities of the donor atoms (giving the configuration index and the absolute
configuration).

IR-9.5 R E F E R E N C E S

1. Nomenclature of Organic Chemistry, IUPAC R ecommendations, e ds. W.H. Powell and
H. Favre, R oyal Society of Chemistry, in preparation.
2. In Nomenclature of Inorganic Chemistry, IUPAC Recommendations 1 990, e d.
G.J. L eigh, B lackwell Scientific Publications, Oxford, 1990, the term didentate was
used rather than bidentate, for reasons of linguistic consistency. Reversion to the
previously accepted term, bidentate, reflects common usage.
3. The names of the other hydrogen isotopes a re discussed in Section IR-3.3.2.
4. The names of organic ligands should be assigned in accordance w ith IUPAC
recommendations, see Ref. 1.
5. In order to simplify the rules and to resolve ambiguities that may arise when i t i s n ot
clear whether a l igand is charged or not, the charge on a l igand is no longer c onsidered in
determining ligand order in the formulae of coordination compounds. (In Nomenclature
of Inorganic Chemistry, IUPAC Recommendations 1 990, e d. G.J. L eigh, Blackwell
Scientific Publications, Oxford, 1990, anionic ligands were listed b efore n eutral
ligands.)
6. Chapter II-7 of Nomenclature of Inorganic Chemistry II, IUPAC R ecommendations
2000, e ds. J.A. M cCleverty and N.G. Connelly, Royal Society of Chemistry, 2001.
7. Nomenclature of Inorganic Chemistry II, IUPAC Recommendations 2000, e ds.
J.A. M cCleverty and N.G. Connelly, Royal Society of Chemistry, 2001.

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