Is it possible to prevent the formation of insoluble copper hydroxides in aqueous solution (pH 9 -11) by complexing with a stronger ligand?
My thought would be to use a ligand that has a pKa that is in the acidic/neutral region and thus would be anionic at higher pH - this would allow it form a complex with the Cu(II) center. This would be done before adjusting pH up to alkaline region and (hopefully) prevent formation of any insoluble hydroxides.
Does this make sense, or is my assumption off-base? If not, does anyone have any ideas about how to go about doing something along theses lines (I'd like to stay away from any nitrogen-containing ligands, due to some other reasons).