Synthesis and characterization of three new Cd(II) coordination polymers with bidentate flexible ligands: Formation of 3D and 1D structures (original) (raw)

Three new coordination polymers of {[Cd(bib) 3 ](ClO 4) 2 } n (1), [Cd(µ 2-bip) 2 (N 3) 2 ] n (2) and [Cd(µ-bib Me)Cl 2 ] n (3) were prepared by using the neutral N-donor ligands 1,4bis(imidazolyl)butane (bib), 1,3-bis(imidazolyl)propane (bip) and 1,4-bis(2methylimidazolyl)butane (bib Me) and CdX 2 (X=ClO 4-, N 3 and Cl-). The results of the X-ray measurements demonstrate that in the crystal structure of 1 and 2 the cadmium(II) ion adopts CdN 6 octahedral geometry while, in the structure of 3, the metal ion forms CdN 2 Cl 2 tetrahedral geometry. In compound 1, six bib ligands are coordinated to one central cadmium(II) to form an open 3D 2-fold interpenetrating framework of the α-polonium (pcu) type topology, while in compound 2 and 3 the N 3 or Clgroups are terminally bonded to the metal center and each linker compound (bip or bib Me) acts as bridging ligand connecting two metal ions to form a one-dimensional zigzag chain. The adjacent 1D chains of complex 2 and 3 are further extended into a non-covalent 2D network structure by C-H•••N and C-H•••Cl intermolecular hydrogen bonds, respectively. The complexes were characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction.