C 18 H 22 Cl 2 N 4 NiO 4 ,monoclinic, C 12/c 1(no. 15), a =10.4852(3) Å, b =18.6442(4) Å, c =10. Source of materialAll reagentsu sed were of analytical grade from commercial sources. Pyridoxal hydrochloride (0.2 mmol, 40.7 mg) and 1,2-diaminoethane (0.1 mmol,6 .0 mg) were dissolved in methanol (10 ml). The mixture was stirred for 30 min to give aclear yellow solution. The solutionwas added amethanol solution (10 ml) of NiCl 2 ·6H 2 O(0.1 mmol, 23.8 mg) with stirring. After keeping the resulting solution at room temperature in air for 7d,red needlelike crystals were formed at the bottom of the vessel on slow evaporation of the solvent. The crystals were isolated, washed three times with methanol and dried in avacuum desiccator over anhydrous CaCl 2 (yield 85.6 %). Elemental analysis-found: C44.1 %, H4.6 %, N11.6 %; calc. for C 18 H 22 N 4 O 4 Cl 2 Ni: C44.3 %, H4.5 %, N11.5 %.