Detection Of Uranium, Fructose1,6-bisphosphate And Fluoride With Emission Spectrometry Using Bis-salophen As Ligand

In the first part of this paper, firstly the properties of supramolecularself-assembly are introduced. Then the brief introduction of bis-salophen, uraniumand uranium-bis-salophen are also showed out. Meanwhile, the characteristics andanalysis of uranium, fructose1,6-bisphosphate (F-1,6-BP) and fluoride ion areoutlined.In the second part, we synthesized a ditopic tetradentate ligand namedbis-salophen, and discussed its application on the determination of uranium. Theligand was synthesizd by using the reaction of salicylaldehyde with3,3’,4,4’-tetraminobiphenyl. The coordination reaction of bis-salophen with uraniumresults in a remarkable enhancement of fluorescence intensity. Under certainconditions the fluorescence intensity of thr system increases linearly with the increaseof uranium concentration. The experimental results show that this reaction can beused for detection of uranium. Under optimal conditions, the linear range for thedetection of uranium is0.003to0.35nmol/mL with a detection limit of0.0017nmol/mL. The proposed method has been successfully applied for the determinationof uranium in actual water samples with satisfactory results.In the third part, we prepared complex uranium-bis-salophen (UBS) by using thereaction of bis-salophen with uranium, and then investigated the self-assemblyreaction of UBS with Fructose1,6-bisphosphate (F-1,6-BP) to formuranium-coordination supramolecular polymer (USP). The self-assembly reactionresults in a production of strong resonance light scattering (RLS) signal. Therefore,this self-assembly reaction can be used for the detection of F-1,6-BP. Under certainconditions the RLS intensity is linearly increased with the increase of F-1,6-BPconcentration. Experimental results show that under the best conditions, the linear range for the detection of uranium is0.05to5.0nmol/mL with a detection limit of0.020nmol/mL. The proposed method has been successfully applied for thedetermination of uranium in actual water samples with satisfactory resultsIn the fourth part, a RLS method for the determination of fluoride ion in aqueoussolution is reported. UBS and pyrophosphate were used for the experiment. We foundthat when UBS self-assembled with pyrophosphate to form supramolecular polymer,the system produced a strong RLS signal. When fluoride ion coexisted with UBS, thefluoride ion occupied the coordination sites in UBS, and the self-assembly reactionwas inhibited. This resulted in a RLS quenching. Based on these findings, weestablished the RLS method for the determination of fluoride ion in aqueous solution.The amount of fluoride ion was detected through measuring the RLS intensity shiftcaused by the inhibiting effect. Under optimal conditions, a linear range was found tobe0.005to1.5nmol/mL with a detection limit of0.0028nmol/mL. The method wasapplied to determine fluoride ion in environmental water samples with the relativestandard deviations of1.3to3.1%and the recoveries of98.7–101.3%...