선택적 광선 흡수를 하는 여러가지 시아닌계 색소의 합성 및 특성 연구

Abstract

The functional dye is a essential material in information industry : especially optical recording materials and optical filter for PDP display. The optical recording material was known as diphenylmethine, methine, polymethine, porphine, indanthrene, quinone, ditol and cyanine dye. The dyes for optical recording material must have specially the optical properties : Selective laser wavelength absorption ability, light-resistance, durability, and so on. The PDP display was used Neon cut off filter, selective wavelength 580～610nm. In this study, synthesized various cyanine dyes and researched the physical properties of optical recording materials and investigated characteristics of selective wavelength absorption with PDP optical filter. Cyanine dyes are researched widely as functional dyes. Especially, indolenine cyanine dyes are expected from their superior solubility and their strong absorption in various wavelengths. Cyanine dyes have relatively good stability, high molar absorption coefficients(～10-5 M-1 cm-1), medium fluorescence intensity, narrow spectrum width and the ability to form H- or J-aggregate. The maximium absorption wavelength of cyanine can be tuned precisely from Near-UV to near IR by chemical structural modification. With these unique photophysical and photochemical properties, cyanine dyes are recently being used in many applications such as nonlinear optics, optical data storage, biomolecular labeling, dye laser, photorefractive materials and photodynamic therapy. Therefore, this study was carried out to research the spectroscopic properties of functional cyanine dyes which lead to change middle-chain and indole. and then, the synthesized cyanine dyes were studied thermal property as -I, -ClO4, -PF6 and -N(SO2CF3)2. Spectroscopic properties of sixteen cyanine dyes were measured with UV/VIS/NIR spectrometer(Shimadzu 3150PC) for characters of half band width, maximum absorption wavelength and shape of wavelength. In addition, Differential Scanning Calorimeter was employed to measure durability for heating. the results were as follows. These cyanine dyes bearing with three methine, five methine and four indole synthesized in above 70%, respectively. Synthesized cyanine dyes represented maximum absorption wavelength at near 539～820nm and had molar extinction coefficient above 3×105. The maximum absorption wavelength was red shift about 100nm with the increase of two methine groups such as cyanine #1(587nm), cyanine #4(681nm). The other hand, half band width of cyanine dyes decreased according to increase middle chains ; cyanine #1(66.5nm), cyanine #4(48nm). Melting point of cyanine dyes differed from salts of dyes. Middle chain forming cyanine #1 and cyanine #4 showed the best melting point complexed with -N(SO2CF3)2. However, cyanine dyes with other form is very well bearing -PF6 salts.