Page 16 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

IR-1.5 G E N E R A L A I M S , F U N C T I O N S A N D M E T H O D S

Examples:
3. 1,5-dicarba-closo-pentaborane(5), B 3 C 2 H 5 (CH replacing BH)

4. stiborodithioic acid, H 3 SbO 2 S 2

Subtractive operations are also regarded as part of the machinery of substitutive
nomenclature.

Example:
5. 4,5-dicarba-9-debor-closo-nonaborate(2 ), [B 6 C 2 H 8 ] 2 (loss of BH)

IR-1.5.3.4 Additive n omenclature
Additive nomenclature treats a c ompound or species as a c ombination of a c entral atom or
central atoms with associated ligands. The p articular additive system used for coordination
compounds ( see Chapter I R-9) is sometimes known as coordination nomenclature although
it may be used for much w ider classes of compounds, as demonstrated for inorganic a cids
(Chapter IR-8) and organometallic compounds (Chapter IR-10) and for a l arge number of
simple molecules and ions named in Table IX. Another additive system is well suited for
naming chains and rings (Section IR-7.4; s ee Example 6 b elow).
Rules within these s ystems provide ligand names and guidelines for the order of citation
of ligand names and central atom names, designation of charge or unpaired electrons on
species, d esignation of point(s) of ligation in complicated ligands, d esignation of spatial
relationships, etc.

Examples:

1. PCl 3 , t richloridophosphorus
2. [CoCl 3 (NH 3 ) 3 ], triamminetrichloridocobalt
3. H 3 SO 4 ( ¼ [SO(OH) 3 ] ), trihydroxidooxidosulfur(1þ)
þ
þ
2
2

4. [Pt(Z -C 2 H 4 )Cl 3 ] , t richlorido(Z -ethene)platinate(1 )
*
5. HONH , h ydridohydroxidonitrogen( * )
6. S 1 S
S 12 N S
S 13 S S 4
S N S
S 7 S
1,7
1,7-diazyundecasulfy-[012.1 ]dicycle
IR-1.5.3.5 General naming procedures

The three basic nomenclature systems m ay provide different but unambiguous names for a
given compound, as demonstrated for PCl 3 above.
The choice between t he three systems depends o n t he class of inorganic c ompound under
consideration and the degree o f d etail one wishes to communicate. The following examples
further illustrate typical aspects that need to be considered before deciding on a n ame.

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