Chiang Mai Journal of Science

     In this work, we reported a rose bengal-modified EuTA framework (denoted as RSO-EuTA) for trinitrophenol (TP) optical recognition. The EuTA (TA = trimesic acid) framework was applied as supporting substrate, and a rose bengal molecule was used as the sensing probe with a loading level of 12 wt%, respectively. EuTA’s absorption in the visible region was proportional to TP concentration, resulting in colorimetric sensing. EuTA’s rose bengal emission was proportional to TP, but its Eu emission was inversely proportional to TP, resulting in ratiometric fluorescent sensing. These two sensing modes had good selectivity and linear sensing response, with fitting equations of A/A0 = 1.4890+0.1906*[TP] (LOD = 1.7 μM) and F554 nm/F615 nm = 0.1242+0.0336*[TP] (LOD = 2.3 μM). Its sensing mechanism was the combination of rose bengal structural transformation triggered by TP and energy transfer between TP and EuTA. RSO-EuTA confirmed its superior sensing performance by offering two sensing modes and naked-eye detection.