A Bi(III)-Nd(III) heterometallic coordination polymer, {[(NO3)Nd(H2O)4(μ3-cydta)Bi- (μ-ONO2)]•2.5H2O}n, was synthesized by Bi(Hcydta)•5H2O and Nd(NO3)•6H2O at a molar ratio of 1︰1 in distilled water (cydta＝trans-cyclohexylene-1,2-diaminetetraacetate). The compound was characterized by elemental analysis, FT-IR, TG-DSC and X-ray single crystal diffraction. It crystallizes in the triclinic system, space group with a＝0.9235(3) nm, b＝1.0902(4) nm, c＝1.4253(5) nm, α＝71.840(4)°, β＝86.877(4)°, γ＝76.991(4)°, Z＝2, Mr＝936.65, V＝1.3284(8) nm3, Dc＝2.342 g•cm－3, μ＝8.646 mm－1, F(000)＝900, R1＝0.0406, and wR2＝0.1124. In this complex, Bi atom is octahedrally coordinated by four carboxyl O atoms and two amido N atoms from a single cydta4－ anion, and two O atoms from different two anions, forming a distorted bicapped trigonal prism geometry. Nd atom is bonded to four O atoms from four H2O molecules, two O atoms from one anion, and three O atoms from three bridging carboxylate groups belonging to different cydta4－ anions, resulting in nine coordination number with a tricapped trigonal prism geometry. The bridging cydta4－ between Bi—Nd atoms and between Bi—Bi atoms result in a novel infinite 2D network structure. FT-IR spectrum and DSC indicate that thermal decomposition proceeded in several stages: dehydration, pyrolysis of ligand, and final decomposition of salt, and the residue is oxide in the formula BiNdO3 at the temperature of 625 ℃.

Key words: heteronuclear complex, bismuth(III), neodymium(III), aminopolycarboxylate ligand, crystal structure