Page 69 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)
P. 69

F O R M  U L A E                                                    IR-4.4





                           3. [Mo 6 O 18 ] 2
                           4. [CuSb 2 ] 5
                           5. [UO 2 ] 2þ
                           6. [SiW 12 O 40 ] 4
                           7. [BH 4 ]

                           8. [ClO 4 ] or ClO 4
                           9. [PtCl 2 {P(OEt) 3 } 2 ]
                          10. [Al(OH)(OH 2 ) 5 ] 2þ
                          11. [PtBrCl(NH 3 )(NO 2 )]

                          12. [PtCl 2 (NH 3 )(py)]
                          13. [Co(en)F 2 (NH 3 ) 2 ] , b ut [CoF 2 (NH 2 CH 2 CH 2 NH 2 )(NH 3 ) 2 ]  þ
                                            þ
                          14. [Co(NH 3 ) 5 (N 3 )] 2

                       In a  f ew cases, a  m  oiety  w  hich comprises different atoms and which occurs  i n  a  series of
                       compounds is considered as an entity  t hat acts as a c entral atom and is cited as such, even if
                       this violates the alphabetical order of ligands.  F or example, PO and UO 2 are regarded as
                       single entities in Examples  1 5  a nd 16.


                       Examples:
                          15. POBr 3 (alphabetically, P Br 3 O)
                          16. [UO 2 Cl 2 ]  ( alphabetically, [UCl 2 O 2 ])


                       For derivatives of parent hydrides (see Chapter IR-6), the alphabetical order of ligands is
                       traditionally disobeyed in that remaining hydrogen atoms are listed first among the ligands
                       in the formula.


                       Examples:

                          17. GeH 2 F 2
                          18. SiH 2 BrCl
                          19. B 2 H 5 Cl

                       For carbaboranes, there has previously been some uncertainty over the order of B  a nd C. 3
                       The order ‘B before C’ recommended here conforms to both electronegativity and
                                                                     1
                       alphabetical order (i.e. i t i s a n  e xception to the Hill order in Section IR-4.2.1). In addition,
                       carbon atoms that replace skeletal boron atoms are cited immediately after boron, regardless
                       of what o ther elements are present. (See also Section IR-6.2.4.4.)


                       Examples:
                                          (recommended)
                          20. B 3 C 2 H 5
                          21. B 3 C 2 H 4 Br  (recommended)


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