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

O R G A N O M E T A L L I C C O M P O U N D S IR-10.2

Examples:
1. H 2
H C C PPh 3
2
Pt
H C C PPh 3
2
H 2
(butane-1,4-diyl)bis(triphenylphosphane)platinum

2.
+
Me
2 1

3 Ir(PEt )
3 3
4 5
Me H H

(2,4-dimethylpenta-1,3-diene-1,5-diyl)tris(triethylphosphane)iridium(1þ)

3. Ph Ph

3 2

Ph P Pt C
3
1
O
PPh 3
(1-oxo-2,3-diphenylpropane-1,3-diyl)bis(triphenylphosphane)platinum

IR-10.2.3.3 The kappa (k) c onvention
Chelate rings that contain a c oordinate (dative) bond from a h eteroatom in addition to a
carbon attachment should be named using t he k convention. In this convention (see Section
IR-9.2.4.2) the coordinating atoms of a p olydentate ligand bonding to a m etal centre are
indicated by the Greek letter kappa, k, p receding the italicized e lement symbol of each
ligating atom. A r ight superscript numeral may be added to the symbol k to indicate the
number of identical bonds from a t ype of ligating atom to the central atom(s); non-equivalent
ligating atoms should e ach be indicated by an italicized e lement symbol preceded by k.
In simple cases o ne or more superscript primes on the element symbol may be used to
differentiate between d onor atoms of the same element. Otherwise a r ight superscript
numeral corresponding to the conventional numbering of the atoms in the ligand is used to
define unambiguously the identity of the ligating atom. These symbols are placed after that
portion of the ligand name which represents the particular f unctionality, substituent group,
ring or chain in which the ligating atom is found.
Often it is only necessary for the coordinating heteroatom to be specified using t he
k convention, the ligating carbon atom being adequately specified by the appropriate
substitutive suffix. For illustrative purposes only, an arrow is used in the examples that

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