Compositional nomenclature cations

In compositional nomenclature, ligands are given in alphabetical order before central atoms. Central atoms are listed in alphabetical order as well. Bridging ligands to the extent known are indicated by the p notation (see Section 3.2.3.4). The numbers of ligands and central atoms are indicated by the appropriate numerical prefixes (see Section 3.3.2). Anions, cations, oxidation states and ionic charges are indicated in the same manner as in mononuclear compounds (see Section 3.3.3). For examples see Table 14. 

IR-1.5.3.2 Compositional nomenclature IR-1.5.3.3 Substitutive nomenclature IR-1.5.3.4 Additive nomenclature IR-1.5.3.5 General naming procedures IR-1.6 Changes to previous IUPAC recommendations IR-1.6.1 Names of cations IR-1.6.2 Names of anions IR-1.6.3 The element sequence of Table VI IR-1.6.4 Names of anionic ligands in (formal) coordination entities IR-1.6.5 Formulae for (formal) coordination entities IR-1.6.6 Additive names of polynuclear entities IR-1.6.7 Names of inorganic acids IR-1.6.8 Addition compounds IR-1.6.9 Miscellaneous... 

Additive nomenclature1 is based on the combination of element names or roots of element names and/or ligand names. The simplest and oldest additive nomenclature is binary nomenclature that expresses two components, e.g. sodium chloride. The cationic or electropositive portion of the compound expressed in a binary name is the element name unchanged or a group name ending in -ium , and the anionic or electronegative portion of a compound expressed in the name ends in -ide, -ite or -ate. The proportions of cations and anions in neutral compounds are indicated by Stock numbers or simple or multiplicative prefixes (see Section 3.3.2). Additive nomenclature denotes composition. For examples see Table 1. 

The natural zeolite community has followed a different path towards a systematisation of its nomenclature. An historically-determined nomenclature in which the crystal structure, the nature of the charge-compensating cation and some thermal properties were taken into account in a non-systematic manner [41] has been replaced by a nomenclature in accordance with the rules of the International Mineralogical Association (IMA) [42], in which both the structure and composition of the mineral are considered. This has led to a substantial increase... 

Table 1 lists some important zeolite types with their chemical and structural features. The reported chemical compositions are idealized for simplicity, so actual formulas may be quite different either as regards the Si/Al ratio or, especially, the cationic composition. Structural codes are those set up by the Structure Commission of the International Zeolite Association, following the recommendations of the lUPAC Commission on Zeolite Nomenclature [6]. 

The coding is part of the official lUPAC nomenclature for microporous materials. However, characterizations of natural zeolites include chemical and instrumental analyses of the samples and are crucial for their further application in water treatment. The chemical composition, usually determined by several different methods classical chemical analysis - gravimetric method, atomic absorption spectrometry or X-ray fluorescence spectrometry, etc., is very important for the efficiency of the water treatment processes and provides insight into the main amount of basic oxide components (SiO and Al O ), exchangeable cations (Na, K, Ca, Mg, Ba, Sr ) and other elements present in smaller concentrations (like Ti atoms). According to the proportion of exchangeable cations, we can then... 

---