Two New Metal-Organic Frameworks Based on 5-Bromoisophthalic Acid and 1,3-bi(4-pyridyl)propane: Hydrothermal Syntheses, Structures, and Magnetic Properties

Two new complexes, [M((H2O)(bpp)(Brip)](n) (M = Co-II (1) and Ni-II (2), bpp = 1,3-bi(4-pyridyl)propane, H(2)Brip = 5-bromoisophthalic acid), have been synthesized through hydrothermal reaction. They were characterized by elemental analysis, IR spectra, thermal analysis, magnetic properties, and X-ray single-crystal diffraction. The two complexes belong to monoclinic system, C2/c space group. The adjacent Co-II or Ni-II ions are bridged by Brip to form an alternate 1D chain. Such 1D chains are further connected by bpp to generate a twofold interpenetrating diamondoid 3D network. Variable-temperature magnetic susceptibility measurements indicate the occurrence of weak ferromagnetic interactions between the Co-II (1) and Ni-II (2) ions, respectively.