The novel complex [Cu2(μ-OH)(Mba)(Phen)2]·(ClO4)2 has been hydrothermally synthesized by Hmba and Phen with copper(II), where Hmba=methoxybenzoic acid and Phen=1,10-phenanthroline. The crystal structure of the complex has been determined by X-ray diffraction. The crystal belong to monoclinic system, space group P21/n The cell parameters are: a=1.149 6(2)nm, b = 1,623 9(3) nm, c = 1.740 4(4) nm, β=106.52(3)°, V=3.115 1(1) nm3, Z=4, μ(Mo K(α)=16.14 cm-1, F (000)=1 728, R1=0.0296, wR2=0.075 7 (I>2σ(I)). The two centric copper(II) ions ar...