Formulae ligand abbreviations

Abbreviations for Ligand Names. Except for certain hydrocarbon radicals, for ligand (L) and metal (M), and a few with H, all abbreviations are in lowercase letters and do not involve hyphens. In formulas, the ligand abbreviation is set off with parentheses. Some common abbrevia-... 

The element symbols within each formula are arranged according to a modified Hill system in which the order is metal(s), C, H and then any remaining symbols arranged alphabetically. Compounds containing two (or more) different metals appear twice (or more), being listed under each metal. Common ligand abbreviations which appear in the text have also been used in the index. These include acac (acetylacetone), bipy (2,2 -bipyridyl), diars [o-phenylenebis(dimethyl-arsine)], dien (diethylenetriamine), etc. 

VII. Appendix Ligand Abbreviations, Formulae, and Structures References... 

Sources, most ligand abbreviations, and formula as indicated will be found in the text, in Sections 5.4.5.5.2 and 5.4.5.6. 

It is often inconvenient to represent all the ligand formulae in detail. Abbreviations are often used and are indeed encouraged, with certain provisos. These are the abbreviations should all be written in lower case (with minor exceptions, such as Me, Et and Ph) and preferably not more than four letters with certain exceptions of wide currency, abbreviations should be defined in a text when they first appear in a formula, the abbreviation should be enclosed in parentheses, and its place in the citation sequence should be determined by its formula, as discussed above and particular attention should be paid to the loss of hydrous from a ligand precursor. 

Figure 1. Formulas of the ligands, abbreviations, and symbols used to represent the components of the dendrimers.

Uses of cnclii,sinj> murks. The formula for the entire coordination enlily. whether charged or not. is enclosed in square brackets. When ligands are polyatomic, their formulae are enclosed in parentheses. Ligand abbreviations are also enclosed in parentheses. In the special case of coordination entities, the nesting order of enclosures is as given [on page A-5I. There should be no space between representations of ionic species within a coordination formula. 

Ligand abbreviations and formulas HjNCCH NHCCHjIjNHj, den (L,5-diaimno-3-azapentane) H2N(CH2)3NH(CH2)3NH2, dpt (l,7-diamino-4-azaheptane)... 

Structures determined by X-ray analysis. Ligand formulae and abbreviations ... 

Table 64 Bidentate Ligands Cited in Section 50.5.4.4 Structures, Formulas and Abbreviations Used in Table 65...

A list of commonly encountered ligand abbreviations is given in Table 10. While it is generally accepted to use abbreviations for ligands in a pseudo formula ([Co(edta)(H20)] ) within textual material to stand for a cumbersome name, it should be recognized that ambiguities in interpretation can always occur with this type of notation. Thus, all abbreviations should be defined within a suitable span of text. Scientific publications should certainly contain at least one formula per compound which is composed only of the internationally accepted atomic symbols, and which accurately defines the composition of the compound or compounds of primary interest reported in the publication. 

The order of citation of central atoms is based on electronegativity as described in Section IR-4.4.2.1. Ligands are cited alphabetically (Section IR-4.4.2.2) according to the first symbol of the ligand formula or ligand abbreviation (see Section IR-4.4.4) as written. Where possible, the ligand formula should be written in such a way that a/the donor atom symbol is closest to the symbol of the central atom to which it is attached. 

Since abbreviations are widely used in the chemical literature, agreement on their use and meaning is desirable. This Section provides guidelines for the selection of ligand abbreviations for application in the formulae of coordination compounds (Section IR-9.2.3.4). Some commonly used ligand abbreviations are listed in Table VII with diagrams of most of the ligands shown in Table VIII. 

These systems may be used in names, but they are not always suitable for use in formulae. The use of donor atom symbols is possible in the formulae of simple systems (see Section IR-9.2.3.4), but care must be taken to avoid ambiguity. The kappa convention is not generally compatible with the use of ligand abbreviations. 

Guidelines for the construction and use of ligand abbreviations are given in Section IR-4.4.4 and their use in the formulae of coordination complexes is described in Section IR-9.2.3.4. Abbreviations are listed in alphabetical order but those beginning with a numeral are listed by the first letter of the abbreviation e.g. 2,3,2-tet appears under the letter t ). 

Abbreviations of names for organic ligands appear sometimes in formulae. Following the recommendations by lUPAC, lower case letters are used, and if necessary, the ligand abbreviation is enclosed within parentheses. Flydrogen atoms that can be replaced by the metal atom are shown in the abbreviation with an upper case H , for example Hjedta, Am(Hedta)(s) (where edta stands for ethylenediaminetetraacetate). 

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