Dear Renjith, which element of lanthanide you want to make complexation with your ligand ? you know they possessing different oxidation state( II, III, IV) with different core size.
Yes they will likely chelate but the lanthanide salts are hydrated so you will probably get your ligands plus solvent or waters coordinated. Prep would be dissolve ligand up in methanol and add however many eqivalents of the lanthanide salt say TbCl3 give a stir and then leave to crystallize. You might try the reaxtion with differrent equivs of your lanthanide salt to see what comes out. I would take the crystals that come out and stick them on a diffractometer to see what you get. Lanthanides are oxophilic so love O donor ligands.