Study Of Fluorescence Sensors And Switches Based On Photoinduced Electron Transfer

Chapter 1. In this chapter, the principles of photo-induced electron transfer, fluorescence sensors and molecular switches based on this principles were simply introduced. The newly developments of sensors based on photo-induced electron transfer for recognition of cations, anions, biological molecules in many fields were summarized and the progresses of molecular switches based on photo-induced electron transfer as molecular devices for information technology in future were reviewed in detail.Chapter 2 In the design of sensors and switches based on photo-induced electron transfer(PET), fluorescence spectroscopy has attracted much attention due to its high sensitivity and selectivity. But in the design of sensors and switches based on PET, it was rarely reported that naphthalene was chosen as fluorophore on PET. In this chapter N-(naphthalen-2-ylmethyl) -N, N-Bis (2- (piperazin-1-yl) ethyl) amine was synthesized and characterized. The photophysical behaviors in aqueous solution were studied in a wide range of acidity by steady-state fluorescence spectroscopy measurement. It was found that the intramolecular PET existed in the solution and the process strongly depended on the acidity of the solution and the mechanism was also discussed.Chapter 3 In different solutions, especially in the cyanomethane solution, the recognition effect of N- (naphthalen-2-ylmethyl) -N, N-Bis (2- (piperazin-1-yl) ethyl) amine to many metal ions were investigated in this chapter. We discovered when Pb²⁺ enter the cyanomethane solution with N- (naphthalen-2-ylmethyl) -N, N-Bis (2- (piperazin-1-yl) ethyl) amine, the intensity of fluorescence spectroscopy become stronger than that of the solution without Pb²⁺. The possible reason is they have good complex ability. Chapter 4 In this chapter N-(naphthalen-2- ylmethyl) -N, N-Bis (2- (di-ethanol amine -1-yl) ethyl) amine was synthesized and characterized. The photophysical behaviors in aqueous solution were studied in a wide range of acidity by steady-state fluorescence spectroscopy measurement. It was found that the intramolecular PET existed in the solution and the process strongly depended on the acidity of the solution and the mechanism was also discussed. Simultaneously In different solutions,especially in the cyanomethane solution, the recognition effect of N-(naphthalen-2- ylmethyl) -N, N-Bis (2- (di-ethanol amine -1-yl) ethyl) amine to many metal ions were investigated in this chapter.