Two 3-D coordination polymers based on 5-sulfoisophthalic acid sodium salt: synthesis, crystal structures and photocatalytic reduction of CO₂

Abstract

Two new coordination polymers constructed from 5-sulfoisophthalic acid sodium salt (NaH₂SIPA) and Co or Cu cations, [Co₃(SIPA)₂(4,4′-bpy)₄(H₂O)₆]·4H₂O (1) and [Cu₆O₃(HSIPA)₃(4,4′-bpy)₆(H₂O)₃]·7H₂O (2), have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction (SXRD), powder X-ray diffraction (PXRD), IR spectroscopy, thermogravimetric analysis, UV-Vis spectroscopy, and elemental analysis. Compound 1 represents a twofold-interpenetrating 3-D framework based on Co, SIPA, and 4,4′-bipyridine ligands with a qzd topology. Different from 1, compound 2 shows a 3-D self-penetrating framework based on Cu, HSIPA, and 4,4′-bipyridine ligands. Furthermore, the photocatalytic performance in reduction of CO₂ of 1 under visible light was investigated.

Graphical Abstract

Keywords:

• Coordination polymers
• 5-sulfoisophthalic acid sodium
• interpenetrating
• self-penetrating
• photoreduction

Disclosure statement

The authors declare no competing interests.

Additional information

Funding

This work was supported by the NSFC (No. 21771035).