Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (12): 1397-1405.DOI: 10.11944/j.issn.1000-0518.2019.12.190125

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Syntheses, Crystal Structures and Magnetic Properties of a 2D Cobalt(Ⅱ) Metal-Organic Framework Based on N,N'-Bis-(3-Pyridyl) Terephthalamide and 1,3,5-Benzenetricarboxylic Acid

WANG Qia,TONG Yuzhangb,JIA Xiaopua,YANG Chuna*,WANG Qinglunb*,LIAO Daizhengb   

  1. aSchool of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130,China
    bDepartment of Chemistry,Nankai University,Tianjin 300071,China
  • Received:2019-04-28 Accepted:2019-07-09 Online:2019-12-01 Published:2019-12-10
  • Contact: YANG Chun,WANG Qinglun
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21771111, No.21601092, No.21371104), the Natural Science Foundation of Hebei Province(No.B2016202280), and the Innovation and Entrepreneurship Training Program of Hebei Province for Undergraduate Students(No.201810080095)

Abstract:

Based on N,N'-bis-(3-pyridyl)terephthalamide (3-bptpa) and 1,3,5-benzenetricarboxylic acid (1,3,5-H3btc), a Co(Ⅱ) metal-organic framework [Co(3-bptpa)(1,3,5-Hbtc)]·2H2O(1) with a 2D grid-like structure was hydrothermally synthesized. Complex 1 was characterized by X-ray crystallography, Fourier transform infrared (FT-IR) spectra, elemental analysis, thermal analysis and magnetic measurements. Each 1,3,5-Hbtc2- provided one chelating and one bridging carboxylate groups to coordinate to Co(Ⅱ) cations. The centrosymmetric dimer [Co(3-bptpa)(1,3,5-Hbtc)]2 was assembled into a 1D ladder-like chains by bridging carboxylate groups. The neighbouring chains were connected into 2D grid-like network by the coordination of 3-bptpa to Co(Ⅱ), resulting in the distorted CoN2O4 octahedral coordination sphere. The magnetic data of complex 1 in the temperature range 16~300 K were analyzed including the one-ion approximation for Co(Ⅱ) with spin-orbit coupling in Oh symmetry and intermolecular exchange interaction(zj') in the molecular field approximation leading to λ=-100.4 cm-1 and zj'=-0.618 cm-1. CCDC:1910964

Key words: dipyridine diamide ligand, hydrothermal synthesis, cobalt(Ⅱ);, metal-organic framework(MOF), magnetic properties