Two new co-crystal copper (II) melamine complexes,[Cu (HBA) 2 (MA) 2][Cu (HBA) 2](1) and [Cu2 (OAc) 4 (MA)·(H2O)] 2 [Cu (HPE) 2](2), MA, melamine; HBA, 2-hydroxybenzaldehyde; HPE, 1-(2-hydroxyphenyl) ethanone, have been synthesized and characterized by elemental analysis, IR and single crystal X-ray diffraction. Crystal structural analysis reveals that 1 and 2 all are co-crystal complexes and composed of two neutral coordination units. ...