Crystal Structure, Synthesis and Luminescence Sensing of a Zn(II) Coordination Polymer with 2,5-Dihydroxy-1,4-Terephthalic Acid and 2,2′-Bipyridine as Ligands

• Published in: Crystals (Basel) 2020-12, Vol.10 (12), p.1105
• Main Authors: Dun, Linan, Zhang, Baosheng, Wang, Jiajun, Wang, He, Chen, Xue, Li, Chuanbi
• Format: Article
• Language: English
• Subjects: Acetone; Coordination polymers; Crystal structure; Data collection; Fourier transforms; Geometry; hydrothermal synthesis; Iron; Ligands; Luminescence; luminescent sensor; Nitrogen; Photoluminescence; Pollutants; Selectivity; Terephthalic acid; Zinc; Zinc oxide
• ISSN: 2073-4352; 2073-4352
• DOI: 10.3390/cryst10121105

A new coordination polymer was synthesized under hydrothermal conditions, namely [Zn(Bpy)(DHTA)0.5]n (DHTA = 2,5-dihydroxy-1,4-terephthalic acid tetra-anion, Bpy = 2,2’-bipyridine). There is one Zn(II) ion in [Zn(Bpy)(DHTA)0.5]n, the metal center Zn(II) is five-coordinated and forms a slightly twisted square pyramidal geometry. It remains stable at temperatures as high as 380 °C, and a sharp drop in weight is found in the temperature range of 380–570 °C. The calculation results show that the residual is zinc(II) oxide (ZnO). The emission peak of the complex appears at 365 nm (λex = 366 nm). The photoluminescence results suggest that the complex has potential as a new luminescence material. At the same time, in luminescence explorations experiments, the complex showed a high degree of selectivity and sensitivity to organic solvents, acetone (DMK) and metal ions (Fe3+).