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Journal of Synthetic Crystals ›› 2026, Vol. 55 ›› Issue (5): 809-815.DOI: 10.16553/j.cnki.issn1000-985x.2026.0004

• Research Articles • Previous Articles    

Structure and Magnetic Properties of a Ni(Ⅱ) Complex Based on 2-(3-Pyridyl) Benzimidazole-5-Carboxylic Acid

ZHANG Liyang1(), FENG Sisi2(), DU Xueqin1, YANG Dongdong3   

  1. 1.Department of Pharmacy,Shanxi Pharmaceutical Vocational College,Taiyuan 030001,China
    2.Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education,Institute of Molecular Science,Shanxi University,Taiyuan 030006,China
    3.School of Chemistry and Environmental Engineering,Shanxi Datong University,Datong 037009,China
  • Received:2026-01-12 Online:2026-05-20 Published:2026-06-09
  • Contact: FENG Sisi

Abstract: A new two-dimensional nickel(Ⅱ) coordination polymer [Ni(pbc)2(H2O)]·2.5H2O (1) [Hpbc=2-(3-pyridyl)benzimidazole-5-carboxylic acid] was successfully synthesized using a solvothermal synthesis method. Its chemical composition and structure were systematically characterized by infrared spectroscopy, elemental analysis, and single-crystal X-ray diffraction. The crystal structure analysis reveals that the central Ni2+ is in a six-coordinate {NiN2O4} environment, exhibiting a slightly distorted octahedral geometry. The deprotonated pbc- ligand demonstrates versatile bridging capabilities by coordinating in two distinct modes:μ2-κO∶κN andμ2-κO,O'∶κN. Through these different coordination modes, the ligands connect adjacent nickel ions along thea-axis direction to form one-dimensional straight chains, and along theb-axis direction to form one-dimensional zigzag chains, respectively. These one-dimensional motifs are subsequently interlinked and extended into a coherent two-dimensional layered network within theab plane. This two-dimensional coordination network is further assembled into a three-dimensional supramolecular framework via intermolecular hydrogen bonds, which involve the participation of uncoordinated nitrogen and oxygen atoms from the ligands and the lattice water molecules. Topological analysis of this framework shows that the complex possesses a binodal (2,4)-connected network structure with the Schläfli symbol {84·122}{8}2. In addition, variable-temperature magnetic susceptibility measurements demonstrate weak ferromagnetic coupling characteristics in the mononuclear nickel complex.

Key words: 2-(3-pyridyl)benzimidazole-5-carboxylic acid; Ni(Ⅱ) complex; crystal structure; magnetic property; solvothermal synthesis method

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