Synthesis, structure and properties of a nickel coordination polymer with 3D supramolecular framework

ABSTRACT

One nickel coordination polymer with 3D supramolecular framework based on 5-(imidazol-1-ylmethyl)isophthalic acid (H₂L) as a main ligand and 1,2-bis(4-pyridyl) ethene (bpe) as a N-containing ancillary ligand, {[NiL(bpe)(H₂O)]·(H₂O)₃}_n(1), has been obtained by hydrothermal synthesis and characterized by powder X-ray diffraction (PXRD), UV/vis, IR, elemental analysis, thermal gravimetric analysis (TGA) and single-crystal XRD. It crystallizes in the monoclinic, space group P2₁/c. In 1, L²⁻ anions connect Ni(II) ions forming 2D layers (Ni₃L₃)_n and then adjacent layers are further associated together by π···π interaction leading to double layers, which are formed by the neighboring imidazolyl group. Meanwhile, hydrogen-bonding interactions between layers extend these double layers into 3D supramolecular network.

KEYWORDS:

• Nickel
• 5-(imidazol-1-ylmethyl)isophthalic acid
• 1,2-bis(4-pyridyl)ethene
• coordination polymer

Funding

This research was supported by the Education Chamber of Henan Province (No.15A150068) and the Key Laboratory of Applied Chemistry of Pingdingshan University (No.201201).