Copper(II) and manganese(II) ions are very important in many biological systems, such as photosynthesis system II and superoxide dismutase. The synthesis of Cu(II) and Mn(II) complexes is a hot-spot not only in bioinorganic chemistry but also in molecular magnetism research. Herein, we report a new mixed complex [Cu~0~.~5Mn~0~.~5 (phen)~2Cl]OH.3H~2O. It is synthesized and characterized by elemental analysis, IR and UV-Vis spectroscopy. The structure of the single crystal is determined by X-ray diffraction. It belongs to the monoclinic system, space group C2/c, with a=2.3321(5), b=3.0295(6), c=0.7492(1)nm, β=97.85(3)ⅲ, V=5.244(3)nm^3, Z=8, Dm=1.425g/cm^3, Dc=1.516g/cm^3, F(000)=1244, R=0.066, Rw=0.068. Both metal ions lie in tetragonal pyramidal environment.

Key words: COPPER COMPLEX, MANGANESE COMPLEX, CRYSTAL STRUCTURE, BENZENE P, CHLORIDE, ELEMENTAL ANALYSIS, INFRARED SPECTROPHOTOMETRY, ULTRAVIOLET SPECTROPHOTOMETRY, FOUNDATION OF NATIONAL SCIENCE FOUNDATION COMMITTEE