pH-dependent two Cd(II) coordination architectures with methyl-3-hydroxy-5-carboxy-2-thiophenecarboxylate and 1,3-bis(4-pyridyl)propane mixed ligands: syntheses, crystal structures, and photoluminescent properties

ABSTRACT

Two new Sulfur-containing cadmium(II) coordination polymers {[Cd(HL)₂](bpp)}_n (1) and {[Cd(L)(bpp)(H₂O)]}_n (2) (H₂L = methyl-3-hydroxy-5-carboxy-2-thiophenecarboxylate, and bpp = 1,3-bis(4-pyridyl)propane) have been synthesized under different pH conditions and structurally characterized by the single-crystal X-ray diffraction and other physicochemical techniques. Structural analyses reveal that compound 1 exhibits a 1D double chain structure based upon dimeric [Cd₂(COO)₂] subunit. Compound 2 features a 3D network which can be rationalized as a 3-fold 4-connected dia net. It is shown that the pH plays a crucial role in the formation of the resulting structures. Furthermore, solid photoluminescent properties of the two compounds make them potentially useful photoactive materials.

GRAPHICAL ABSTRACT

KEYWORDS:

• Cadmium(II)
• methyl-3-hydroxy-5-carboxy-2-thiophenecarboxylate
• 1,3-bis(4-pyridyl)propane
• topology
• photoluminescent properties

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [21401097].