Solvent-controlled structural variation of two Cd(II) compounds derived from thiophene dicarboxylate and 4-imidazol-1-yl-pyridine mixed ligands

Abstract

Two solvent-controlled Cd(II) compounds, formulated as {[Cd₂(Htdc)₄(µ-imyp)(H₂O)₄]} (1), [Cd₂(µ₂-tdc)₂(µ-imyp)(DMF)₂(H₂O)₂]_n (2) (H₂tdc= 2,5-thiophenedicarboxylic acid, imyp = 4-imidazol-1-yl-pyridine and DMF = N,N-dimethylformamide) have been synthesized by reactions of Cd(NO₃)₂·4H₂O and H₂tdc with imyp in different solvents, respectively. Both compounds were then characterized by single-crystal X-ray diffraction and other physicochemical methods. In 1, partially deprotonated Htdc⁻ anion as terminal ligand and µ-imyp ligand connect Cd²⁺ ions to generate a discrete structure. In 2, completely deprotonated µ₂ – tdc²⁻ anions and µ-imyp ligand link Cd²⁺ ions into a 1D double chain structure. Both compounds display 3D supramolecular structures through hydrogen bonding interactions. The results provided interesting insights into solvent effects on the structural formation of compounds 1 and 2. In addition, the solid-state photoluminescent properties of compounds 1 and 2 were also investigated.

Two solvent-controlled Cd(II) compounds have been synthesized by reactions of Cd(NO₃)₂·4H₂O and 2,5-thiophenedicarboxylic acid with 4-imidazol-1-yl-pyridine in the different solvents. One compound is a discrete structure, while the other compound has a 1D double chain structure. The results provided interesting insights into solvent effects on the structural formation of compounds.

GRAPHICAL ABSTRACT

KEYWORDS:

• Cd(II) compounds
• 2,5-thiophenedicarboxylic acid
• 4-imidazol-1-yl-pyridine
• thermal stabilities
• photoluminescent properties

Disclosure statement

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

Additional information

Funding

This work was supported by the Henan Provincial College Students Innovation and Entrepreneurship Training Program [grant number S202110482026].