Study Of Room Temperature Phosphorescence Sensors And Switches Based On Photo-induced Electron Transfer

Chapter 1 In this chapter, the principles of photoinduced electron transfer, sensors and molecular switches based on this principles were simply introduced. In recent years, the developments of sensors based on photoinduced electron transfer for recognition of cations, anions, biological molecules in many fields and molecular switches based on photoinduced electron transfer as molecular devices for information technology in future were reviewed in details.Chapter 2 In the design of sensors and switches based on photoinduced electron transfer, fluorescence was often used with high sensitivity and convenience. It is noteworthy that room temperature phosphorescence (RTF) has many advantages over fluorescence, e.g., large Stokes shift, higher signal to noise ratio, good selectivity and easily measurable luminescence lifetimes etc., and it can be found as a helpful complementary method of fluorescence sensing. However, there are few reports dealing with the applications of phosphorescence in this field. Herein we designed and synthesized three photoinduced electron transfer(PET) phosphoroionophores, (1-Bromo -naphthalen-2-ylmethyl)-bis-(2-hydroxyl-ethyl)-amine (BND), (1-Bromo-naphthalen-2-yl -methyl)-bis-(2-cholor-ethyl)-amine(BNC) and 7,16-Bis-(1-bromo-naphthalen-2-ylmethyl) -1,4,10,l3-tetraoxa-7,l6-diaza -cyclooctadecane and their phosphorescent characteristics were studied, compared with 1-Bromo-2-methylnaphthalene. The experimental results showed that strong phosphorescence could be observed in p-cyclodextrin aqueous solution only at low pH value. This system combined AND and NOT function to produce a three-input inhibit(INH) logic gate.Chapter 3 In this chapter , we investigated the effect of generally used organic solvents on RTP of 1-bromonaphthalene (1-BrN), 1-bromo-2-methyl-naphthalene(1-Br-2-MN), 1-bromo-4-methylnaphthalene (1-Br-4-MN) and 6-bromo-2-naphthylsulfate potassium (BNS) in β-cyclodextrin(CD) aqueous solution. Comparing the results of purging nitrogen and not purging nitrogen, we found that in the presence of micro amount cyclohexane, dichloromethane, 1,2-dichloroethane, chloroform, tetrahydrofuran (with an except for BNS) etc, strong non-deoxygenated RTP could be observed. Moreover, good linear relationships and relatively lower detection limits for analysis goal were obtained in the range detected based on the non-deoxygenated CD-RTP.