Construction of two photoluminescent sulfur-containing cadmium(II) coordination polymers with 4-connected topology based on a methyl-3-hydroxy-5-carboxy-2-thiophenecarboxylate ligand

ABSTRACT

Two new Sulfur-containing Cadmium(II) coordination polymers {[Cd(HL)₂](2H₂O)}_n (1) and {[Cd(L)(bmie)(H₂O)](H₂O)}_n (2) (H₂L = methyl-3-hydroxy-5-carboxy-2-thiophenecarboxylate, and bmie = 1,2-bis(imidazol-1′-yl)ethane) have been successfully constructed and structurally characterized by the single-crystal X-ray diffraction and other characterization techniques, such as elemental analysis, IR spectroscopy and thermogravimetric analysis. Structural analyses reveal that complex 1 exhibits a hydrogen bonded-extended 3D supramolecular structure based upon 4-connected sql layers assembled from single Cd(II) centers as nodes. Complex 2 features a 3D network which can be rationalized as a rare 4-connected cdl topology. It is shown that the H₂L ligand is a suitable building block in constructing coordination polymers with structural diversities. Moreover, solid photoluminescent properties have been investigated.

GRAPHICAL ABSTRACT

KEYWORDS:

• Coordination polymers
• methyl-3-hydroxy-5-carboxy-2-thiophenecarboxylate
• 1,2-bis(imidazol-1′-yl)ethane
• topology
• photoluminescent properties

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (grant no. 21401097), the Foundation for University Young Key Teacher by Henan Province of China (grant no. 2014GGJS-116) and the Natural Science Foundation of Henan Province (grant no. 172102310333).