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en is the symbol for the ligand ethylenediamine. Ethylenediamine is a polydentate ligand, meaning it can bind at more than one site. For polydentate ligands, or ligands that already have a di-, tri-, tetra-, etc. prefix (ex. ethylenediamine) we use the prefixes bis-, tris-, tetrakis-, etc. Since it is (en)2 it would be named bisethylenediamine.
Hi so I have a clarification question about the use of prefixes when naming. If the ligand in the coordinate compound has a prefix of -di, -tri, -tetra, etc. anywhere in its name, rather than just in the front, then you should use the prefixes of -bis, -tris, -tetrakis, etc? I know that you use the second set of prefixes in the example of diethylenetriamine, but I was wondering if you also would use them in the case of ethylenediamine and other ligands where there is a prefix in the middle of the compound.
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