Page 48 - 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

31.
BPh 3

Rh

6
2
2
(Z ,Z -cycloocta-1,5-diene)(Z -phenyltriphenylborato)rhodium, or
6
[(1,2,5,6-Z)-cycloocta-1,5-diene)](Z -phenyltriphenylboranuido)rhodium
IR-10.2.6 Metallocene nomenclature
The first transition element compound containing only carbocyclic rings as ligands was
5
5
bis(Z -cyclopentadienyl)iron, [Fe(Z -C 5 H 5 ) 2 ], which has a ‘ sandwich’ structure with two
parallel Z - 5 o r p-bonded r ings. The recognition that this compound was amenable to
electrophilic substitution, similar to the aromatic behaviour of benzene, led to the suggestion
of the non-systematic name ‘ferrocene’ and to similar names for other ‘metallocenes’.

Examples:

1. [V(Z -C 5 H 5 ) 2 ] 5 v anadocene
2. [Cr(Z -C 5 H 5 ) 2 ] 5 c hromocene
3. [Co(Z -C 5 H 5 ) 2 ] 5 c obaltocene
4. [Ni(Z -C 5 H 5 ) 2 ] 5 n ickelocene
5. [Ru(Z -C 5 H 5 ) 2 ] 5 r uthenocene
6. [Os(Z -C 5 H 5 ) 2 ] 5 o smocene

Metallocene derivatives may be named either by the standard organic suffix (functional)
nomenclature or by prefix nomenclature. The organic functional suffix system is described in
Section P-33 of Ref. 3. Metallocene substituent g roup names have endings ‘ocenyl’,
‘ocenediyl’, ‘ocenetriyl’, etc.

Examples:
7. COMe

Fe

acetylferrocene, or 1-ferrocenylethan-1-one
8. H
NMe 2
Me
Fe

1-[1-(dimethylamino)ethyl]ferrocene, or
1-ferrocenyl-N,N-dimethylethan-1-amine

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