How many chelate rings are present in each of the following complexes?;#["Cu"("trien")]^(2+)#, #["Fe"("ox")_3]^(3-)#, #["Ru"("bpy")_3]^(2+)#, and #["Co"("dien")_2]^(3+)#. Thanks

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Answer 1 · 2018-04-27T22:02:12

Three; three; three; four.

The number of rings equals the number of bonds you can cut without having the ion fall into two pieces.

#bb("Cu(trien)"^"2+")#

Cu(trien)2+
(Adapted from Sign of truth)

In the above diagram, I can make three cuts, so there are three chelate rings.

#bb("Fe"("ox")_3^"3-")#

Fe(ox)3
(Adapted from Chemical Entity Data Page)

I can make three cuts, so there are three chelate rings.

#bb("Ru"("bpy")_3^"2+")#

Now that to know the technique, can you identify the three chelate rings in this ion?

#bb("Co(dien)"_2^"3+")#

Co(dien)2
(From IUCr Journals)

Here, there are four chelate rings.