![]() (h) The number of cations or anions to be written in the formula is calculated on the basis that total positive charge must be equal to total negative charge. These abbreviations should be in lower case and enclosed in parenthesis.įor example, py is used for pyridine and en is used for ethane-1, 2-diamine or ethylene diamine. (g) Sometimes abbreviations are used for formulae of the ligands. (f) There should be no space between the representations of ionic species within the formula. Polyatomic ligands are enclosed in parentheses (), but all ligands are written without any separation in between. (e) The formula for the co-ordination entity, whether charged or not, is enclosed in square brackets. ![]() ![]() In case of abbreviated ligand, the first letter of the abbreviation is used to determine the position of the ligand in alphabetical order. (d) Polydentate ligands are also listed alphabetically.
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