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

1 Answer
Apr 27, 2018

Three; three; three; four.

Explanation:

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

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

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

upload.wikimedia.orgupload.wikimedia.org

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

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

Co(dien)2Co(dien)2
(From IUCr Journals)

Here, there are four chelate rings.