New Two-photon Materials Design, Synthesis, Characterization And Application In Photopolymerization And Biological Fluorescent Probe,

The photophysical and photochemical induced by two-photon absorption possess especial characteristics, which make the two-photon absorption (TPA) materials have a potential application in a lot of fields. In 1999, S.R.Marder successfully induced two-photon photopolymerization using the new TPA materials with D- π -D type. The technique can be used to fabricate photonic crystal, which attracts a broad attention. Effective initiators are a key in two-photon initiated photopolymerization (TPIP), and a lot of initiators have been designed and investigated. But some factors such as a low effective TPA cross-section or a dissolvability in oligomer restrict the development of TPIP, so exploring effective initiators still are an important in the studying of TPIP. Our group has firstly done some efforts in the synthesis materials and TPIP in china, on the base of the work, we improved the set-up system of TPIP, and synthesized some new TPA materials and investigated their linear and nonlinear optical properties and got some conclusions. At the same time, TPIP are finished with these new TPA materials, and we found that the compounds successfully initiated photopolymerization except a few compounds because of a low dissolvability in oligomer or a departure excited wavelength. In addition, we firstly investigated the spectral changes between two-photon initiator and monomer according to the studying method of the common photopolymerization mechanism, and concluded the two-photon photopolymerization mechanism.There are special advantages when TPA materials are applied in biological sciences. Firstly, the two-photon excited wavelengths (600-900 nm) are located in the window of biology, which greatly reduces overall sample photodamage. Secondly, The long wavelength and localized excitation provide less unwanted scattering, so the photophysical and photochemical can be induced in any point of three-dimension space. Therefore, we firstly investigated the spectral changes between TPA materials (two carbazole compounds) and ctDNA and concluded the possible interaction.The central work is listed as following:...