Hydrogen nomenclature

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The hydrogen nomenclature can also be adapted to yield satisfactory names for derivatives obtained in formal fashion by replacing a coordinated oxo group from the acid. A small selection is given below. 

As discussed above, the important chemical property of acidity is highly solvent-dependent. but a traditional nomenclature emphasizes this property by using the word acid in the name. The aim of the systematic coordination nomenclature presented here is to describe a composition and a structure, not a chemical property. Consequently, a specialized word such as acid has no place in it. This is the hydrogen nomenclature [shown in Table 1-4). However, in recognition of current practice, the acid nomenclature is retained as an alternative. This is only partly systematic. 

Anions. The hydrogen nomenclature name described above consists of two parts, the second of which is an anion name. This can stand alone to represent the anion itself. 

For example, a heteropolyacid, F SiMo C o, is called tetrahydrogen hexa-triacontaoxo(tetraoxosilicato)dodecamolybdate(4-) [hydrogen nomenclature] or tetrahydrogen silicododecamolybdate [abbreviated semi-trivial name]. Or this is called 12-(or dodeca)molybdosilicic acid for the acid form and 12-(or dodeca)-molybdosilicate for the anion [recommendations of IUPAC, 1971 (76)]. 

Traditional name Hydrogen nomenclature Acid nomenclature... 

Systematic hydrogen nomenclature considers the oxoacid as a hydrogen salt of the corresponding conjugate base. In this way, the number of ionizable hydrogen atoms is immediately obvious. Furthermore, structural information about the... 

This is an alternative method of nomenclature, but one that is less easily interpretable in terms of structure than the hydrogen nomenclature. The name consists of two words, the second always being acid . The name gives the number of oxygen atoms attached to the central atom, the identity of the central atom and (usually) the oxidation state of the central atom. The first word in the name always ends in -ic , in contrast to traditional usage of -ic or -ous . Selected examples are listed in the table ... 

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