CMU scientists discover new material that degrades harmful dyes in water sources

7 July 2021

Faculty of Science

Researchers from the Faculty of Science, Chiang Mai University have discovered a new coordination polymer that has the property to transform from a single crystal into a single-crystal photocatalyst, revealing a secret at the molecular-level by using x-ray crystallography and electron microscopy.
Dr. Saranphong Yimklan from the Department of Chemistry and Mr. Nippich Kaeosamut, a DPST-funded master’s student, in collaboration with Dr. Yothin Chimupala from the Department of Industrial Chemistry, have discovered a novel zinc coordination polymer that has a twofold interpenetrated structure between the enantiomers, forming a 3D solid-state racemate by using the microwave-assisted techniques that significantly reduce the synthesis time from days to a few minutes.

The study of the crystal structure using x-ray crystallography and the crystal morph using electron microscopy revealed the ligand substitution-induced single-crystal-to-single-crystal (SCSC) transformation and photocatalysis, and the halide anion type specificity.
Moreover, it is found that the structure’s positive charge affects the photocatalysis in the degradation of anionic dyes that are harmful to the environment.

The single-crystal-to-single-crystal transformation is the material’s response to the stimulus with rare specificity, leading to a greater understanding of the relationship between the material’s structure-property and more advanced applications.

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