Functional Au/Ag Nanoparticles Sensors And S-triazine Derivatives For Metal Ions Recognition

This paper includes three chapters:Chapter 1: The first chapter described the research of the harm and detection method of heavy metal ions in recent years; the principle of metal ions colorimetric chemical sensors; the latest research status of metal-organic complexes; the principle of functional Au/Ag nanoparticles sensors and s-triazine ligand colorimetric chemical sensors; the significance of our paper selected topic and the main research content.Chapter 2: Two different organic compounds ARS and ATN modified Au/Ag nanopartical were synthesized and characterized by TEM, FT-IR and UV-vis spectroscopy. I. Colorimetric detection to Al3+ by ARS modified silver nanoparticles. Under the optimum experimental conditons, there was a linear relationship between the absorbance ratio A600/A395 and the concentration of Al3+ in the 1.0 to 5.3 μM concentration range, with a detection limit of 0.12 μM. This method possessed a lot of advantages such as simple, inexpensive, high selectivity, visualized and so on. It can be used the swift detection in the actual water sample. II. Colorimetric detection to Al3+ by ATN modified silver nanoparticles. The absorption spectrum of these nanoparticles(NPs) underwent dramatic changes on exposure to Al3+ ions, with a new absorption peak appeared at 620 nm.There was a linear relationship between the absorbance ratio A620/A520 and the concentration of Al3+ in the 9 to 23 μM concentration range, with a detection limit of 0.29 μM. Furthermore, we also study the nature of interaction between host with guest, the coordinate bond of oxygen or nitrogen atom on the ligand with Al3+ destroy the stability of the system and induced the rapid assemble of Au/Ag nanoparticles.Chapter 3: Based on above research, in this chapter we started with cyanuric chloride, synthesis two novel s-triazine compounds 1(2,4-dianiline-6-(dimethylaminobenzoylamino)-1,3,5-triazine) and 2(2,4-dianiline-6-(fluoresceinacylamino)-1,3,5-triazine) and characterized by NMR, FT-IR, Mass and elemental analysis. The recognition results between the two host compounds and metal ions in different proportional buffered solution were investigated by UV-vis spectroscopy. Results indicated that the compound 1 and 2 exhibited sensing towards Cu2+ but weakly sensing toward other cations, producing a new absorption peak in the long wavelength. The models of compound 1 intergraded with Cu2+ was 1:1, the association constants of 1-Cu2+ were 1.0×104 M-1. There was a linear relationship in the 1 to 30 μM concentration range, with a detection limit of 7.3×10-7 mol L-1. Meanwhile, the spectrum of compound 2 underwent to distinct changed when it intergraded with Cu2+ and produce a new absorptive peak at 520 nm. The ratio of compound 2 intergraded with Cu2+ was 2:1 and the association constant was 8.1×108 M-2. Further evidence that the compound 1 and 2 coordination with Cu2+ to form stable complex by titration of UV-Vis and 1H NMR. Furthermore, the compound 1 and 2 exhibited well sensitivity by the anti-interference test, which exclude the affect from other mixture ions when recognition Cu2+.