Alphabetical order of ligands

In a few cases, a moiety which comprises different atoms and which occurs in a series of compounds is considered as an entity that acts as a central atom and is cited as such, even if this violates the alphabetical order of ligands. For example, PO and U02 are regarded as single entities in Examples 15 and 16. 

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. 

According to the latest IUPAC Convention the names of ligands surrounding the central metal atom are written in alphabetical order of preference irrespective of whether they are negative or neutral. For example, in the complex [Co(NH3)4 C1(N02)], the ligands are named in the order ammine, chloro and... 

The ligands in the inner coordination sphere are listed in alphabetical order of the ligand s root name (ignoring any prefixes). 

In empirical formulas of inorganic compounds, electropositive elements are listed first [3]. The stoichiometry of the element symbols is indicated at the lower right-hand side by index numbers. If necessary, the charges of ions are placed at the top right-hand side next to the element symbol (e.g., S "). In ions of complexes, the central atom is specified before the ligands are listed in alphabetical order, the complex ion is set in square brackets (e.g., Na2[Sn(OH)+]). 

Naming a Coordination Compound. To name a coordination compound, the names of the ligands are attached directly in front of the name of the central atom. The ligands are listed in alphabetical order regardless of the number of each and with the name of a ligand treated as a unit. Thus diammine is listed under a and dimethylamine under d. The oxidation number of the central atom is stated last by either the oxidation number or charge number. 

Negatively coordinated groups are given before neutral coordinated groups in the examples of Werner scheme names above. Ewens and Bassett presented good reasons why that order should be reversed. The lUPAC rules (20) recommend that ligands be cited in alphabetical order regardless of their... 

The Access Tables have been laid out in a manner that parallels the foregoing chapters. The first three tables provide listings according to element and ligand. Tables 4 to 18 and 20 correspond to the chapters of Volumes 1 and 5. Table 13 covers ligand synthesis. Two additional tables cover physical techniques for the study of complexes and thermochemistry. The final table is entitled Special Topics and includes aspects that defied inclusion under earlier headings and these aspects are listed purely in alphabetical order. 

Ligands are named in alphabetical order, ignoring the Greek prefix that indicates the number of each one present. 

In naming a complex ion, the ligands are named in alphabetical order. A prefix that is used to indicate the number of ligands is not considered as part of the name of the ligand. For example,... 

In all cases in which we determined specific descriptors, we assumed an alphabetical priority order of the unspecified ligands (g > h > i.. . ) and R chirality for any ligand marked. ... 

Multiple bridging ligands between the pair of central atoms are cited in alphabetical order. Italicised element symbols indicating the coordinating atoms in bridging ligands are cited in the order of direction of the CRU and are separated by a colon. 

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