The IronQ complex was synthesized following the methodology described in our previous study.26 (link) Shortly, stirring quercetin hydrate (0.0050 moles) (Sigma, USA) in a round bottle with 500 mL HPLC-methanol (Sigma, USA) until complete dissolution, the solution’s color shifted yellow. Then, the PH of mixed solution was gradually modified to 12 using a NaOH solution. Subsequently, Iron (III) chloride (Sigma, USA) solution was freshly prepared by dissolving 0.0025 moles of Iron (III) chloride in 500 mL of ultrapure water (up water) to integrate with the quercetin solution resulting in a dark yellow mixture, which was subsequently incubated for 2 hours at 60°C under a continued stirring. After that, the total solution was filtered and evaporated to dryness. The resulting dark powder was collected and reserved it at room temperature (RT) in a drying apparatus, protected from the light.