Importance of principles of additive nomenclature ?
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Answer:
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Explanation:
Additive nomenclature is the nomenclature that is used to name co-ordination compounds and other similar compounds which consist of a central atom surrounded by electron donating groups called ligands
Additive nomenclature is the nomenclature that is used to name co-ordination compounds and other similar compounds which consist of a central atom surrounded by electron donating groups called ligands. This nomenclature was originally developed to name coordination compounds, but is also being used for other compounds as discussed before. The rules of this nomenclature are as follows :
(i) The cation is named first in both positively and negatively charged coordination entities.
(ii) The ligands are named in an alphabetical order before the name of the central atom/ion. (This procedure is reversed from writing formula).
(iii) Names of the anionic ligands end in –o, those of neutral and cationic ligands are the same except aqua for H2O, ammine for NH3, carbonyl for CO and nitrosyl for NO. These are placed within enclosing marks ( ).
(iv) Prefixes mono, di, tri, etc., are used to indicate the number of the individual ligands in the coordination entity. When the names of the ligands include a numerical prefix, then the terms, bis, tris, tetrakis are used, the ligand to which they refer being placed in parentheses. For example, [NiCl2(PPh3)2] is named as dichlorobis(triphenylphosphine)nickel(II).
(v) Oxidation state of the metal in cation, anion or neutral coordination entity is indicated by Roman numeral in parenthesis.
(vi) If the complex ion is a cation, the metal is named same as the element. For example, Co in a complex cation is called cobalt and Pt is called platinum. If the complex ion is an anion, the name of the metal ends with the suffix – ate. For example, Co in a complex anion {Co(SCN)4]2- is called cobaltate. For some metals, the Latin names are used in the complex anions, e.g., ferrate for Fe.
(vii) The neutral complex molecule is named similar to that of the complex cation.