Design And Synthesis Of Organic Dyes And Their Application In Dye-Sensitized Solar Cells And Ion Fluorescence Recognition

This paper consists of two parts, the first part is the synthesis and application of sensitizer in dye-sensitized solar cell and the second part is about the application of small organic molecule fluorescence probe.(1). Due to its simple preparation process and low cost, the dye-sensitized solar cells have attracted extensive interest. Currently, ruthenium polypyridyl complexes are widely used for sensitizers. While, this type of dye has difficulties in synthesis and purification. For the multiple type and being easily adjusted on the structure, pure organic dyes are expected to improve the efficiency of the battery and reduce the cost of the battery.In this part, A new kind of sensitizer which had imidazoline as the electron donor were designed and synthesized, which represents a new type of pure organic sensitizer. According to the studies of its structure, spectral and photovoltaic properties, we found that the intramolecular charge transfer occurred efficiently. The orbital energy level can not only match the REDOX potential of oxidation reduction electric in the liquid electrolyte, but also suit the conduction band energy level of nanocrystalline semiconductor. Thus, the sensitizer can efficiently convert solar energy into electrical energy, which made the η be3.65%.(2). Through much more study, people found that the hypochloride and hydrogen sulfide played very important roles in the organism. While, the detection method for these two ions at present have limitations in selectivity, sensitivity and detection limit. It’s urgent to develop fluorescence probes, which have excellent performance and can be used in living cells.In this part, we successfully prepared hypochloride fluorescence probe based on squaraine. This probe showed good photostability, high sensitivity and excellent selectivity for hypochloride. Additionally, being linearly proportional, our probe could response to low level (26nM) of hypochloride. Furthermore, combining HPLC analyzing, we developed a new method for hypochloride detection based on the rapid desulfurization of thio-squaraine, which can lead our researchers to explore much more. Due to the excellent properties of thio-squaraines, our probe is expected to be an efficient way to investigate the biological behavior of hypochloride.On the other hand, A new type of hydrogen sulfide fluorescence probe were designed and synthesized with pyrene as a matrix structure. The synthesis and post-processing are very simple. Sulfur hydrogen exist in the form of hydrogen sulfide in the body, so we adopted hydrogen sulfide (HS-) as the testing object in practical detection. Experimental results showed that the probe had high selectivity for sulfur hydrogen, good linearity and low detection limit (0.42μM) in the detection. As for its good solubility in water, the probe is expected to be used in living cells.