A twofold interpenetrated 3-D Cu(II) coordination polymer based on 5-(pyridin-4-yl)isophthalic acid: synthesis, crystal structure, and magnetic properties

Abstract

A new copper(II) coordination polymer, [Cu(PIA)·2H₂O]_n (1) [H₂PIA = 5-(pyridin-4-yl)isophthalic acid], has been synthesized and characterized by elemental analysis, IR spectroscopy, TGA, powder, and single-crystal X-ray diffraction. Structural analysis shows that each PIA²⁻ in 1 bridges three Cu(II) ions, and likewise each Cu(II) ion connects to three PIA²⁻ ligands, giving a 3-D framework with utp topology and left-/right-handed helical channels. Interestingly, two such identical frameworks interlock with each other to generate a twofold interpenetrated structure that is stabilized by hydrogen bonding and π–π interactions. In addition, the thermal stability and the magnetic properties of 1 have been investigated.

Graphical abstract

Keywords:

• Cu(II) coordination polymer
• 5-(pyridin-4-yl)isophthalic acid ligand
• crystal structure
• magnetic properties

Disclosure statement

No potential conflict of interest was reported by the authors.

Funding

This work was supported by the National Nature Science Foundation of China [grant number 21001061]; Shandong Provincial Natural Science Foundation, China [grant number ZR2014BQ034].