Crystallization of Mn(II) and Cd(II) Complexes in A Water-Methanol System: Tartrate vs Nicotinamide Ligand Selectivity

Ligand selectivity of tartrate vs nicotinamide in a water-methanol system has been observed the crystallization Mn(II) and Cd(II) complexes. These complexes were crystallized at room temperature by layered solution technique using mixture solvent M(II):tartrate:nicotinamide (M = Mn, Cd) molar ratio 1:1:2. Complexes M(II)-nicotinamide M(II)-tartrate also prepared for data comparison. Analysis crystals infrared spectroscopy, powder-X-ray diffraction qualitative anion test showed that presence both nicotinamide, forms neutral Mn(II)-tartrate hydrate complex, whereas ionic Cd(II)-nicotinamide chloride complex. In case tend to coordinate as ligand than although was doubled ligand. contrast, is more predominant complex anionic tartrate. The tartrate-nicotinamide likely due use salt precursor choice mixture. addition, powder-XRD analysis confirms there no indication co-crystallized together same time metal ions.