Two infrared dyes, 1,3,3,1′, 3′, 3′ hexamethylindotricarbocyanine iodide (A) and 1,3,3,1′,3′,3′ hexamethyl 11 chloro 10,12 propylenetricarbocyanine iodide (B), were synthesized and characterized by melting...Two infrared dyes, 1,3,3,1′, 3′, 3′ hexamethylindotricarbocyanine iodide (A) and 1,3,3,1′,3′,3′ hexamethyl 11 chloro 10,12 propylenetricarbocyanine iodide (B), were synthesized and characterized by melting point, elemental analysis, IR, and 1 H NMR. Their electron absorption spectra, laser absorption characteristics and solubility were investigated. The results showed that A and B have maximum absorption peaks at around 748nm and 774nm, respectivey, which match well with the wavelength output of the near infrared laser diode. The dyes were found to have photoinduced fading during irradiation with the infrared laser, especially in the presence of oxygen. However, this procession can be greatly slowed by using a layer of poly(vinyl alcohol) to barricade the dyes from oxygen. The experiments also showed that the dyes were thermally stable but decayed under strong sunlight. Furthermore, they are easily dissolved in some common solvents.展开更多
文摘Two infrared dyes, 1,3,3,1′, 3′, 3′ hexamethylindotricarbocyanine iodide (A) and 1,3,3,1′,3′,3′ hexamethyl 11 chloro 10,12 propylenetricarbocyanine iodide (B), were synthesized and characterized by melting point, elemental analysis, IR, and 1 H NMR. Their electron absorption spectra, laser absorption characteristics and solubility were investigated. The results showed that A and B have maximum absorption peaks at around 748nm and 774nm, respectivey, which match well with the wavelength output of the near infrared laser diode. The dyes were found to have photoinduced fading during irradiation with the infrared laser, especially in the presence of oxygen. However, this procession can be greatly slowed by using a layer of poly(vinyl alcohol) to barricade the dyes from oxygen. The experiments also showed that the dyes were thermally stable but decayed under strong sunlight. Furthermore, they are easily dissolved in some common solvents.
