What is the type of oxygen-donating ligands that prefer to bind iron but not aluminum?
The separation of iron, aluminium binary system should be little tricky in case both are in + 3 oxidation state. However if iron is in +2 state then the separation is fairly easy. still i will suggest to add 1,10-phenanthroline ligand which is a N,N donor ligand in presence of this ligand the tendency of iron(III) to reduce to iron(II) gets increased manifold and even milder reducing agent like hydroxylamine hydrochloride can reduce it to tris phenanthroline iron (II) complex and can be separated over ion exchange column as red complex.
O,O donor ligand may not be a good choice as O is a hard donor site and Fe 3+ as well as Al 3+ are harder metal ions hence they shall be interfering. still 8-hydroxy quinolate has a relatively higher affinity towards Al 3+ than Fe 3+
Both metals are in the +3 oxidation state. Iron(II) has a higher affinity for N-donating ligands, but it is not part of my question, I'm just asking about iron(III) and Al.
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