Ruthenium(II) 2,2’- Biimidazole based anion Sensor/Colorimeter
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Anions play various key roles in numerous biological, chemical, and environmental processes and numerous sensors have been developed to detect and study them. Current anion sensors have been designed to detect a broad range of anions, but the interactions between the sensor and anion are not fully understood. Cui et al. synthesized a new anion sensor, Ru(bpy)2(H2biim)(PF6)2], which has had little research done on its’ specific interactions.1 They determined what interactions occurred between the sensor and the anions and the factors that affected the strength of the various interactions. To study the interaction the researchers used a variety of titration experiments. They also used ESI-MS and x-ray crystallography to confirm some of their specific theories. In the presence of chosen anion, the sensor displayed a distinct color change. This color change varied between the specific anions chosen for the study. The color change indicated a successful interaction between the anion and the sensor. While the varying colors indicated that the strength of the interaction did vary between the analytes studied. This sensor has laid the groundwork for future sensors capable of more specific detection. In the future with costs under control, it could be possible to save more of our damaged environment with early and specific detection of harmful anions.