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IR-4.7                                                       F O R M  U L A E





           IR-4.6.4    Indication of excited states
                       Excited electronic states may be indicated by an asterisk as right superscript. This practice
                       does not differentiate between different excited states.

                       Examples:

                           1. He*
                           2. NO*

           IR-4.6.5    Structural descriptors

                       Structural descriptors such as cis, trans, etc., are listed  i n  T able V. Usually such descriptors
                       are used as italicized  p refixes  a nd are connected to the formula by a  h yphen.


                       Examples:
                           1. cis-[PtCl 2 (NH 3 ) 2 ]
                           2. trans-[PtCl 4 (NH 3 ) 2 ]


                       The descriptor m designates an atom or group bridging  c oordination centres.

                       Example:

                           3. [(H 3 N) 5 Cr(m-OH)Cr(NH 3 ) 5 ] 5þ


           IR-4.7      R E F E R E N C E S

                       1. This is the so-called Hill order. S ee E.A. Hill, J. Am. Chem. Soc., 22, 4 78–494 (1900).
                       2. For intermetallic compounds, earlier recommendations prescribed alphabetical ordering
                          rather than by electronegativity (see Section I-4.6.6 of Nomenclature of Inorganic
                          Chemistry, IUPAC Recommendations 1990,  e  d. G.J.  L  eigh, Blackwell Scientific
                          Publications, Oxford, 1990).
                       3. For example, the ordering  o f B  and C  i n  f ormulae was inconsistent in Nomenclature of
                          Inorganic Chemistry, IUPAC Recommendations 1990,  e  d. G.J. Leigh, Blackwell
                          Scientific Publications, Oxford, 1990.
                       4. Nomenclature of Organic Chemistry, IUPAC  R ecommendations, e ds. W.H. P owell and
                          H. Favre, R oyal Society of Chemistry, in preparation.
                       5. Chapter  I I-2  o f Nomenclature of Inorganic Chemistry II, IUPAC  R  ecommendations
                          2000, e ds. J.A. M  cCleverty and N.G. Connelly, Royal Society of Chemistry, 2001. (Red
                          Book  I I.)












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