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The coordination number should be the number of bonds that are formed with the main cation; en, or ethylenediamine, has 2 nitrogens, each with a lone pair that can be donated. Since it's a polydentate, more specifically a bidentate, if it is (en)2, then the coordination number should be 4. As Gina1L mentioned, it would have to be (en)3 for the coordination number to be 6.
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