Synthesis, structure and photoluminescence of three 2D Cd(II) coordination polymers based on varied dicarboxylate ligand

Abstract

Three coordination polymers (CPs) based on different dicarboxylic acids and Cd(II), [Cd₃(tpa)₃(DMA)₄] (1), [Cd₂(thpa)₂(DMA)₂·DMA] (2), and [Cd₃(eba)₃(DMA)] (3) (H₂tpa = terephthalic acid, H₂thpa = thiophenedicarboxylic acid, H₂eba = (ethene-1,2-diyl)dibenzoic acid, DMA = N,N′-dimethylacetamide), were synthesized under solvothermal conditions. The CPs were characterized by elemental analysis (EA), single-crystal X-ray crystallography, powder X-ray diffraction, infrared spectroscopy (IR), and thermogravimetric analyses. X-ray crystallographic analysis shows that 1 and 3 exhibit a 2D six-connected hxl network based on hourglass-like [Cd₃(COO)₆] SBUs, whereas 2 displays a 2D 4⁴-sql network based on [Cd₄(COO)₈] SBUs. Thermal stabilities and photoluminescence behaviors of the CPs are also discussed.

Keywords:

• Cd(II)
• dicarboxylic acid
• photoluminescence
• coordination polymer

Funding

This work was supported by the NSFC [grant number 21201110], [grant number 21571115]; Research Award Fund for Outstanding Middle-aged Young Scientist of Shandong Province [grant number BS2013CL010]; Young Scholars Program of Shandong University [grant numbaer 2015WLJH24]; and The Fundamental Research Funds of Shandong University [grant number 2015JC045].

Disclosure statement

No potential conflict of interest was reported by the authors.