Why is methanol used in recrystallization rather than water?
Answers
Answered by
0
It is possible to use any solvent that solvates something to crystalise it.
However if you want the solvent not to be present in the crystal, then you need to be careful.
And the rate of the reaction is probably also going to be important to you.
The coordination chemistry of the metal needs to favour full substitution with the acetylacetonoate.
The outer surface of a fully AA substituted complex is going to be strongly lipophilic.
A water molecule in a coordination position will present a charged exterior, but a methanol molecule won't. So it will be easier to deposit partially substituted molecules on the crystal surfaces and thence exchange up to the bidentate ligand coordination using that deposition catalytically.
However if you want the solvent not to be present in the crystal, then you need to be careful.
And the rate of the reaction is probably also going to be important to you.
The coordination chemistry of the metal needs to favour full substitution with the acetylacetonoate.
The outer surface of a fully AA substituted complex is going to be strongly lipophilic.
A water molecule in a coordination position will present a charged exterior, but a methanol molecule won't. So it will be easier to deposit partially substituted molecules on the crystal surfaces and thence exchange up to the bidentate ligand coordination using that deposition catalytically.
Similar questions