Page 52 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

IR-10.3 O R G A N O M E T A L L I C C O M P O U N D S

Many organometallic compounds of groups 1 a nd 2 e xist in associated molecular form
(as aggregates) or contain structural s olvent, or both. However, their names are often based
solely on the stoichiometric compositions of the compounds, unless it is specifically desired
to draw attention to the extent of aggregation or the nature of any structural s olvent, or both
(see Example 3 b elow). In the examples below, note how the different types of name reflect
the different structural c ontent implied by the formulae shown. As usual, t he formulae
enclosed in square brackets designate c oordination entities.
Note that metallocene terminology (Section IR-10.2.6) is not recommended f or
bis(cyclopentadienyl) compounds o f t he main group metals ( see Examples 6 and 7).

Examples:
1. [BeEtH]
ethylhydridoberyllium, or ethanidohydridoberyllium
2. Na(CHCH 2 )
sodium ethenide ( compositional n ame)
Na–CH¼CH 2 , o r [ Na(CH¼CH 2 )]
ethenidosodium, ethenylsodium, or vinylsodium
3. [{Li(OEt 2 )(m 3 -Ph)} 4 ]
tetrakis[(ethoxyethane)(m 3 -phenyl)lithium], or
tetrakis[(m 3 -benzenido)(ethoxyethane)lithium]
4. 2Na (Ph 2 CCPh 2 ) 2
þ
disodium 1,1,2,2-tetraphenylethane-1,2-diide (compositional name)
Ph 2 C(Na) C(Na)Ph 2
(m-1,1,2,2-tetraphenylethane-1,2-diyl)disodium, or
1
2
2
(m-1,1,2,2-tetraphenylethane-1,2-diido-k C ,C )disodium
5.
Mg
4 1

3 2
CH CH CH=CMe 2
2
2
[2-(4-methylpent-3-en-1-yl)but-2-ene-1,4-diyl]magnesium, o r
2 1
4
[2-(4-methylpent-3-en-1-yl)but-2-ene-1,4-diido-k C ,C ]magnesium
5
6. [Mg(Z -C 5 H 5 ) 2 ]
5
bis(Z -cyclopentadienyl)magnesium, o r
5
bis(Z -cyclopentadienido)magnesium
5
7. [PPh 4 ][Li(Z -C 5 H 5 ) 2 ]
5
tetraphenylphosphanium bis(Z -cyclopentadienyl)lithate(1–), or
5
tetraphenylphosphanium bis(Z -cyclopentadienido)lithate(1–)
8. LiMe lithium methanide (compositional n ame)
[LiMe] methyllithium
[(LiMe) 4 ] t etra-m 3 -methyl-tetralithium
poly(methyllithium)
(LiMe) n

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