Crystal and Molecular Structures of［Cu_2（OAc）_4（Ur）_2］．2H_2O and｛［Cu（H_2Y）］．Ur·H_2O｝_n（Ur＝urea； H_4Y＝EDTA）

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Crystal and Molecular Structures of [Cu_2 (OAc)_4(Ur)_2].2H_2O and {[Cu(H_2Y)].Ur·H_2O}_n(Ur=urea;H_4Y=EDTA)

The crystal structures of the complexes Cu2(OAc)4(Ur)2].2H2O1 and {Cu (H2Y)].Ur.H2O}n 2 have been determined by X-ray diffraction method. Complex 1 is monoclinic space group P21 with a=8.472(2),b=4.097(3),c=8.725(1),β=109.03(1)°,V=985.03,Mr=441.33,Z=2,Dc=1.488g/cm3,μ(MoKa)=22.1 cm-1,F(000) =448,final R=0.065(Rω=0.083) for 2325 unique reflections with Ⅰ≥3σ(Ⅰ).The two Cu atoms are bridged by four acetato,and there are two terminal urea ligands,one on each Cu atom.Complex 2 crystallizes in orthorhombic space group P21 21 21 with celll parameters a =15.114(5),b=15.516(3),c=6.873(2),V=1611.83,Mr=431.84,Z=4,Dc=1.779 g/cm3,F(000)=892,μ(MoKa)=14.2 cm-1,R=0.054,(Rω=0.073) for 1651 unique reflections with Ⅰ≥3σ(Ⅰ).In complex 2 the four carboxyl groups of EDTA are in different fashions:one carboxyl group is not coordinated,two carboxylato groups are as monodentate ligands,and only one bridges the metal atoms to form infinite structure.