Page 50 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)
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IR-2.15                                                       G R A M  M  A R





                       (cf. S ection IR-2.15.3.4). Where p ossible, the donor atom symbol in ligand formulae should
                       be placed nearest the symbol of the central atom to which it is coordinated. (See Section
                       IR-9.2.3.1.)

                       Example:

                           6. [CrCl 2 (NH 3 ) 2 (OH 2 ) 2 ]
                       (c) In the construction of the formula for a ( formal) addition  c ompound, the formulae of the
                       individual components a re ordered first by number of each component, then alphabetically.
                       (See Section IR-4.4.3.5.)
                       Alphabetical order is used in names as follows.
                       (d) In compositional names, the names of the formally electropositive components and the
                       names of the formally electronegative components a re each arranged alphabetically with the
                       former group of components  p receding the latter. Note that this order of components may
                       therefore deviate from the order of the corresponding components in the formula, as in
                       Examples 7, 9  a nd 10 below.

                       Examples:

                                                   magnesium potassium fluoride
                           7. KMgF 3
                           8. BiClO               bismuth chloride oxide
                           9. ZnI(OH)              zinc hydroxide iodide
                                                   iron strontium oxide (cf. E xample 5  a bove)
                          10. SrFeO 3
                       (e) In the citation of ligands in additive names. The alphabetical citation  o f l igand names is
                       maintained regardless of the number of each ligand, or whether the compounds are
                       mononuclear or polynuclear (cf. S ection IR-2.15.3.4).

                       Examples:
                          11. K[AuS(S 2 )]         potassium (disulfido)sulfidoaurate(1 )
                          12. [CrCl 2 (NH 3 ) 4 ] þ  tetraamminedichloridochromium(1þ)


                       A  s imilar rule  a pplies when  c iting names of substituent g roups in substitutive nomenclature
                       (see Section IR-6.3.1).

                       (f) For  c  itation  o  f  t he names of the skeletal atoms in the chains and rings additive
                       nomenclature (cf. S ection IR-7.4.3).

                       Example:

                          13. HOS(O) 2 SeSH
                              1,4-dihydrido-2,2-dioxido-1-oxy-3-seleny-2,4-disulfy-[4]catena

                       (g) In the construction of the name  f or a  ( formal) addition  c ompound, the names of the
                       individual components a re ordered first by number of each component, then alphabetically.
                       (See Section IR-5.5.)


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