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Can someone explain to me why the name of [Cr(en)2(H2O)Cl]Cl2 is aquachlorobis(ethylenediamine)chromium (III) chloride. I understand all of it except the bis(ethylenediamine) part. I know that the bis- is there because ethylenediamine is bidentate. But what I don't understand is why there isn't also a di- infront of ethylenediamine since the complex is (en)2. Usually you use di- to indicate that there are two of that ligand.
You use bis-, tris-, tetrakis-, etc. when there are multiple of the same polydentate anion. If there are 2 (en) then it would be bisethylenediammine. If there is only one (en) it would be ethylenediammine. Another example is oxalato. If there is one (ox) it would be oxalato but there were 2 (ox) it will be bisoxalato. I hope this helped!
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