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

Abstract

Two new complexes, [M((H₂O)(bpp)(Brip)]_n (M = Co^II (1) and Ni^II (2), bpp = 1,3-bi(4-pyridyl)propane, H₂Brip = 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.

Keywords :

• 1
• 3-bi(4-pyridyl)propane
• 5-bromoisophthalic acid
• crystal structure
• magnetic properties

Acknowledgments

The authors gratefully acknowledge the support of the Natural Science Foundation of Henan Province Educational Committee (12B150019) and the Youth Foundation of Luoyang Normal University (2011-QNJJ-003).