Page 35 - 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

Example:
2. 3
CH 3
1 1
2
(OC) Re 1 2
5
C Mn(CO) 5
H 2
5
2
1
5
decacarbonyl-1k C,2k C-(m-propane-1,2-diyl-1kC :2kC )rheniummanganese
IR-10.2.3.5 Metal–metal bonding
Metal–metal bonding is indicated by the italicized element symbols of the appropriate
metal atoms, separated by an ‘em’ dash and enclosed in parentheses, placed after the list of
central atom names and before the ionic c harge. The element symbols are placed in the
same order as the central atoms appear i n t he name, i.e. with the element met last in the
sequence of Table VI given first. The n umber of such metal–metal bonds i s i ndicated by an
arabic numeral placed before the first element symbol and separated from it by a s pace.
For the purpose o f n omenclature, no distinction is made between d ifferent metal–metal
bond orders.

Examples:
1. H C CH 2
2
(OC) Os Os(CO) 4
4
(m-ethane-1,2-diyl)bis(tetracarbonylosmium)(Os— O s)

2. Me
C
Co(CO) 3
(OC) Co
3
Co
(CO) 3
(m 3 -ethane-1,1,1-triyl)-triangulo-tris(tricarbonylcobalt)(3 Co—Co)

3.
O
C
1 W Re 2
C C
O O
5
5
di-m-carbonyl-carbonyl-2kC-bis(1Z -cyclopentadienyl)(2Z -
cyclopentadienyl)tungstenrhenium(W — Re)
The Z terms involved here are explained in Section IR-10.2.5.1. For a more d etailed
discussion of dinuclear compounds and larger polynuclear clusters, with further examples,
see Section IR-9.2.5.

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