Abstract: The complex[NdCo(NTA)₂(H₂O)_11/3(CH₃OH)_1/3]·(CH₃OH)_2/3·10/3H₂O (1)was obtained by the diffusion between two kinds of reactions.It crystallizes in triclinic space group P₁ with cell parameters a=0.963 6(2) nm,b=1.044 9(2) nm,c=1.339 3(2) nm,α=107.04°,β=98.25(2)°,γ=103.98°,V=1.2172(4) nm³,Z=2.The complex exhibits a 3-D network structure.The complex [Nd₂Co₃(EDTA)₃(H₂O)₁₁·12H₂O] (2) crystallizes in monoclinic space group C₂ with cell parameters a=1.592 5(3) nm,b=1.465 5(2) nm,c=1.474 1(2) nm,β=116.407(2)°,V=3.081 3(8) nm³,Z=2.Each Nd³⁺ is connected to three Co²⁺ through three carboxylate bridges,while eachCo²⁺ has two Nd³⁺ neighbors.In this way,a twelve-member cycle is produced and connected to each other to form a two-dimension network sheet.These sheets are further linked into a three-dimensional network by the water molecules between the layers through rich hydrogen bonds.

Key words: cobalt(Ⅱ), neodymium(Ⅲ), heteropolynuclear, nitrilotriacetate, ethylenediminetetraaceate