Page 40 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

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

in several types o f b onding (see Example 17 below, where the ligand name ends in ‘yl’, but the
bonding is described using an Z term placed elsewhere in the name, and Example 24, where
1
the C atoms in the cyclopentadienyl ligands are involved in binding to both central atoms).

CH 2
M M
CH 2
H 2 C C H 2
2
2
1
5
(cyclopenta-2,4-dien-1-yl-κC )(η -ethene) (η -cyclopentadienyl)(η -ethene)
M CH CH 2 M
CH CH 2
1
5
(cyclopenta-2,4-dien-1-yl-κC )(vinyl) (η -cyclopentadienyl)(vinyl)
Complexes o f u nsaturated systems incorporating heteroatoms may be designated in the
same manner if both the carbon atoms and adjacent heteroatoms are coordinated. Names for
typical unsaturated molecules and groups acting as ligands are listed in Table IR-10.4, and
this is followed by examples illustrating the naming of compounds containing such ligands.
Note that when u sing the Z prefixes, shorthand f orms of anion and substituent g roup
5
5
names are acceptable, e.g. Z -cyclohexadienido instead o f Z -cyclohexa-2,4-dien-1-ido and
5
5
Z -cyclohexadienyl instead of Z -cyclohexa-2,4-dien-1-yl.
Table IR-10.4 Ligand names for unsaturated molecules and groups
Ligand a Systematic name as Systematic name as Acceptable
anionic ligand neutral ligand alternative name
3
3
3
Z -propenido Z -propenyl Z -allyl
3
3
Z -(Z)-butenido Z -(Z)-butenyl
3
3
3
Z -2-methylpropenido Z -2-methylpropenyl Z -2-methylallyl
4
4
Z -2-methylidenepropane- Z -2-methylidenepropane-
1,3-diido 1,3-diyl
3
3
3
3
3
3
Z ,Z -2,3- Z ,Z -2,3- Z ,Z -2,2 -biallyl
0
dimethylidenebutane- dimethylidenebutane-
1,4-diido 1,4-diyl
5
5
Z -(Z,Z)-pentadienido Z -(Z,Z)-pentadienyl
5
5
Z -cyclopentadienido Z -cyclopentadienyl
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