Structural tuning of coordination polymers with photoluminescent properties via temperature control

Abstract

Using a two-solvent interdiffusion technique, the ligand tpatpy that possesses aggregation-induced emission (AIE) properties was coordinated to Cd²⁺ to construct two coordination polymers under conditions that differed only by reaction temperatures of 30 °C and 0 °C for 1 and 2, respectively. Single-crystal X-ray diffraction studies revealed the key structural differences were that the metal centers in 1 were five-coordinate, versus four-coordinate in 2. Thus, this system could be tuned by controlling the temperature during synthesis. UV-visible spectroscopy (UV-Vis), infrared spectroscopy (IR), powder X-ray diffraction (PXRD), thermogravimetry (TG), and the fluorescence of 1 and 2 are discussed to provide a comprehensive discussion of physical and electronic properties.

Keywords:

• Crystal structure
• coordination polymers
• structural tuning
• photoluminescence
• AIE ligand

Disclosure statement

There are no conflicts to declare.

Additional information

Funding

We are grateful for the financial support from the Basic Research Project of Qinghai Province (No. 2021-ZJ-742) and National Natural Science Foundation of China (No. 52003003), the help from the scientific research and innovation team of the New Functional Photoelectric Materials of Anhui Jianzhu University and single crystal X-ray refinement assistance from Z.-Y. Zhang of Bruker (Beijing) Scientific Technology Co. Ltd.