Page 71 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)
P. 71

F O R M  U L A E                                                    IR-4.4





                           3. FeO(OH)
                           4. NaTl(NO 3 ) 2
                           5. Li[H 2 PO 4 ]
                           6. NaNH 4 [HPO 4 ]
                           7. Na[HPHO 3 ]

                           8. CuK 5 Sb 2 or K 5 CuSb 2
                           9. K 5 [CuSb 2 ]
                          10. H[AuCl 4 ]

                          11. Na(UO 2 ) 3 [Zn(H 2 O) 6 ](O 2 CMe) 9

                       The first formula in Example 8  w as arrived at by considering K  a nd Cu to be electropositive
                       constituents and Sb to be electronegative, the second by considering K  t o  b e  e lectropositive
                       and Cu and Sb to be electronegative. No structural information is conveyed by these
                       formulae. The  f ormula  i n  E  xample 9, on the other  h  and, implies the presence of the
                                             5
                       coordination entity [CuSb 2 ] .
                          Deviation from alphabetical order of constituents in the same class is allowed to
                       emphasize similarities between  c ompounds.

                       Example:

                          12. CaTiO 3 and ZnTiO 3 (rather t han TiZnO 3 )

                       Some generalized salts may also be treated as addition compounds, see Section IR-4.4.3.5.


           IR-4.4.3.5  (Formal) a ddition compounds

                       In the formulae of addition compounds or compounds which can formally be regarded as
                       such, including clathrates and multiple salts, the formulae of the component molecules or
                       entities  a re cited in order of increasing number; if they occur in equal numbers,  t hey are
                       cited in alphabetical order in the sense of Section IR-4.4.2.2. In addition compounds
                       containing water, the water remains conventionally cited last. However, component boron
                       compounds are no longer treated as exceptions.


                       Examples:
                                     :
                           1. 3CdSO 4 8H 2 O
                                     :
                           2. Na 2 CO 3 10H 2 O
                                            :
                                      :
                           3. Al 2 (SO 4 ) 3 K 2 SO 4 24H 2 O
                                   :
                           4. AlCl 3 4EtOH
                                  :
                           5. 8H 2 S 46H 2 O
                                  :    :
                           6. C 6 H 6 NH 3 Ni(CN) 2
                                 :
                           7. BF 3 2H 2 O
                                 :
                           8. BF 3 2MeOH

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