[celtic07]

Just recently, I prepared an isomer of potassium bis (iminodiacetato) cobaltate, with formula K [Co (HN(CH2CO2)2)2] in the lab.
All I know about it, is that it turned out to be a PURPLE isomer and now I am struggling to find which ONE!

I did the IR for the compound (please see attached) for which I have to identify the NH and carboxylate stretching frequencies.

I need help with drawing all isomers for this complex, indicationg the geometrical/optical ones (by trying to draw mirror images) and then identifing which is the least strained and most likely to have been synthesised.

Now, what I know about this is that I should start by constructing the 2 tridentate ligands and looking at the position of each donor atom (O or N) at the metal centre, both fac- and mer- arrangements of each tridentate ligand L3 maybe possible.

Probably the following arrangements would help?

cis-N and cis-N with fac-L3 and fac-L3

trans-N and trans-N with fac-L3 and fac-L3

trans-N and trans-N with mer-L3 and mer-L3

I do really need some help with drawing the structures tho, I have a general idea for the solution layout but I'm finding it hard to follow...thanks for looking

[celtic07]

Anyone any ideas?? No?

[refid]

It's a Complex molecule, difficult to interpret without H-NMR

[celtic07]

It's a Complex molecule, difficult to interpret without H-NMR

I know, however I have to do so refering to the attached IR only. For the isomers I need to show how N and O are positioned from the central metal, not very detailed structures.

Im a bit lost though...would really appreciate some help :-(