Page 41 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)
P. 41

G R A M  M  A R                                                     I  R-2.8





                       (d) To designate the mass number and/or the atomic n umber of nuclides represented by their
                       symbols. T he mass number is written as a  l eft superscript, and the atomic number as a  l eft
                       subscript.


                       Examples:

                           9.  18 8 O
                              3
                          10. H
                              1
                       (e) As a  r ight superscript to the symbol Z, t o  i ndicate the hapticity of a  l igand (see Sections
                       IR-9.2.4.3 and IR-10.2.5.1). As a  r ight subscript to the symbol m, t o  i ndicate the bridging
                       multiplicity of a  l igand (see Section IR-9.2.5.2).



                       Example:
                                    5
                          11. [{Ni(Z -C 5 H 5 )} 3 (m 3 -CO) 2 ]
                       Arabic  n umerals are also used as locants in names (see Section IR-2.14.2), and in the
                       following ways.

                       (a) To indicate the number of metal–metal bonds in polynuclear compounds.


                       Example:
                          12.                             O
                                                          C
                                                              Ni
                                                      Ni
                                                                Ni
                                                           C
                                                           O

                                   di-m 3 -carbonyl-cyclo-tris(cyclopentadienylnickel)(3 Ni—Ni)

                       (b) To indicate charge.


                       Examples:
                          13. [CoCl(NH 3 ) 5 ] 2þ  pentaamminechloridocobalt(2þ)
                          14. [AlCl 4 ]            tetrachloridoaluminate(1 )


                       Note that the number ‘1’ must be included i n o rder to avoid a mbiguity i n r elation to symbols
                       for optical rotation [see Section IR-2.2.3.1(j)].

                       (c) As a  r ight subscript to the symbol m, t o  i ndicate  b ridging multiplicity of a  l igand (see
                       Section IR-9.2.5.2).




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