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There is a rule for naming that states that you used the Greek prefixes bis-, tris-, tetrakis-, etc. if the ligand already contains a Greek prefix. What does this mean, and is there an example that can be used so that I could better understand this concept?
Bis-, Tris-, and Tetrakis- are typically used for larger ligand to show that there is 2/3/4 of the entire ligand and not just one part of it. A good example would be using these prefixes with ethlyenediamine which is a large ligand.
Using the Greek prefixes bis-, tris-, tetrakis-, etc. if the ligand already contains a Greek prefix simply means that if the ligand already contains the prefixes di-, tri-, tetra- or hexa- in its name then you should use the other set of prefixes (bis-, tris-, tetrakis-, etc.) to distinguish the coordination number for that type of ligand. A common example is the neutral ligand Ethylenediamine (aka en), NH2CH2CH2NHCH2CH2NH2. If this ligand has a coordination number of 2, then the suffix bis- would be added to the name because the suffix di- is already included in the name as "diamine".
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