Page 46 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

IR-2.13 G R A M M A R

(iii) when specifying configuration using c onfiguration indexes (IR-9.3.5.3), i n o rder to
differentiate between d onor atoms of the same priority, depending on whether t hey are
located within the same ligand or portion of the ligand.

Example:
1. [Rh 3 Cl(m-Cl)(CO) 3 {m 3 -Ph 2 PCH 2 P(Ph)CH 2 PPh 2 } 2 ] þ

+
Ph
Ph P 2 P PPh 2
O C 2 C O 3 Cl
Rh 1 Rh Rh
Cl O C
Ph P 2 P PPh 2
Ph

2
tricarbonyl-1kC,2kC,3kC-m-chlorido-1:2k Cl-chlorido-3kCl-bis{m 3 -
bis[(diphenylphosphanyl)methyl]-1kP:3kP -phenylphosphane-2kP}trirhodium(1þ)
0
(b) Primes, d ouble p rimes, triple primes, etc. are also used as right superscripts in the
Kro ¨ger–Vink notation (see Section IR-11.4) where they indicate a s ite which has one, two,
three, etc. u nits of negative e ffective charge.
Example:
x
0
2. Li x Li;1 2x Mg * Li;x V Li,x Cl Cl

IR-2.13 M U L T I P L I C A T I V E P R E F I X E S

The number of identical chemical entities i n a name is expressed b y a multiplicative prefix
(see Table IV).
In the case of simple e ntities s uch as monoatomic ligands the multiplicative prefixes
di, tri, tetra, p enta, etc., are used.
The multiplicative prefixes bis, tris, tetrakis, p entakis, etc. a re used with composite
ligand names or in order to avoid ambiguity. The m odified entity is placed within
parentheses.

Examples:
diiron trioxide
1. Fe 2 O 3
2. [PtCl 4 ] 2 tetrachloridoplatinate(2 )
3. [Fe(CCPh) 2 (CO) 4 ] t etracarbonylbis(phenylethynyl)iron
thallium tris(iodide) (cf. S ection IR-5.4.2.3)
4. TlI 3
tricalcium bis(phosphate)
5. Ca 3 (PO 4 ) 2
6. [Pt(PPh 3 ) 4 ] t etrakis(triphenylphosphane)platinum(0)

Composite multiplicative prefixes a re built up by citing units first, then tens, h undreds and
so on, e.g. 35 is written p entatriaconta ( or pentatriacontakis).

37