Succimer synthesis

Isolate the solid complexes of trivalent lanthanide complexes with meso-2,3-Dimercaptosuccinic Acid, furan-2-carboxylic acid, meso-2,3-dimercaptosuccinic acid and sarcosine from the mixture of equimolar solutions of metal nitrates and ligands. Adjust the pH of the mixture to 7 by adding dilute solution of KOH. Reflux the mixture in ethanol (15-20 ml) for 3-4 hours on a steam bath. The clear solution gives a solid mass on cooling, filter through G4 glass crucible and wash several times with the mixture of doubly distilled water and alcohol. Recrystallise it to obtain pure crystal and dry at 60 ° -70 °C [1].