Page 28 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)
P. 28

IR-2.2                                                        G R A M  M  A R





                       Examples:
                          12. [Co(NH 3 ) 6 ][Cr(CN) 6 ] ( comprising the ions [Co(NH 3 ) 6 ] 3þ  and [Cr(CN) 6 ] )
                                                                                         3
                                                                                          2
                          13. [Co(NH 3 ) 6 ] 2 [Pt(CN) 4 ] 3 (comprising the ions [Co(NH 3 ) 6 ] 3þ  and [Pt(CN) 4 ] )

                       (d) To enclose structural formulae.

                       Example:
                          14.                                      +





                                                          Mo(CO) 3

                                                        7
                                                  [Mo(Z -C 7 H 7 )(CO) 3 ] þ

                       (e) In solid-state chemistry, to indicate an atom or a  g roup of atoms in an octahedral site.
                       (See Section IR-11.4.3.)

                       Example:


                          15. (Mg)[Cr 2 ]O 4
                       (f) In specifically labelled compounds (see also Section II-2.4.2.2 of Ref. 2).


                       Example:
                                 15
                          16. H 2 [ N]NH 2

                       Note that this distinguishes the specifically labelled compound from the isotopically
                                           15
                       substituted compound H 2 NNH 2 .
                       (g) In selectively labelled compounds (see also Section II-2.4.3.2 of Ref. 2).

                       Example:
                              18  32
                          17. [ O, P]H 3 PO 4

                       (h) To indicate repeating units in chain compounds.

                       Example:

                          18. SiH 3 [SiH 2 ] 8 SiH 3

           IR-2.2.2.2  Use in names
                       Square brackets are used in names in the following ways.

                       (a) In specifically and selectively labelled compounds the nuclide symbol is placed in square
                       brackets  b  efore  t he name of the part of the compound that is isotopically  m  odified.


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