Synthesis and structural characterization of dinuclear copper(II) complex [Cu₂(C₂O₄)(2,2'-bpy)₂(H₂O)₂]·(NO₃)₂

Abstract

A new copper(II) complex [Cu₂(C₂O₄)(2,2'-bpy)₂(H₂O)₂]·(NO₃)₂ has been synthesized by the reaction of copper nitrate with 2,2'-bipyridine and potassium oxalate in aqueous solution. X-ray diffraction analysis indicates that the title complex crystallizes in monoclinic system, space group PZ₁/n with a = 7.717(3) Å, b = 10.221(3) Å, c = 16.582(5) Å, <img src='/image/spc_char/beta.gif' border=0> = 100.110(5)°, V = 1287.5(7) ų, Mr =687.53, Z = 2, Dc = 1.773 g/cm³, <img src='/image/spc_char/lamda.gif' border=0> = 0.71073 Å, <img src='/image/spc_char/micro.gif' border=0>(MoK<img src='/image/spc_char/alpha.gif' border=0>) = 1.729 mm^-1 and F(000) = 696. The final R and <i>w</i>R factors for the observed reflections with I>2σ(I) are 0.0255 and 0.0610, respectively. The dinuclear complex consists of a coordination cation [Cu₂(C₂O₄) (2,2'-bpy)₂(H₂O)₂]²⁺ and two NO₃^- anions. Each copper(II) atom is five-coordinated in a distorted tetragonal pyramidal geometry.