新 carbazole tricationic 盐, 4,4-(1E,1E )-2,2-(9-(2-(1-(2-hydroxyethyl)pyridinium-4-yl)ethyl)-9H-carbazole-3,6-diyl) 二度(ethane-2,1-diyl ) 二度(1-(2-hydroxyethyl ) pyridinium ) 碘化物(THEPC ) 被综合。Photophysical 实验证明了 THEPC 有大二光子的激动的荧光行动剖面图(33 美国通用汽车公司面对 DNA ) ,它作为好生物 fluorophore 评价 THEPC。从电子吸收,圆二色性和 single-/two-photon 荧光排放系列的结果建议 THEPC 能强烈绑在 DNA,与 5.79 的一个内在的有约束力的常数
A new carbazole tricationic salt, 4,4'-(1E,1'E)-2,2'-(9-(2-(1-(2-hydroxyethyl)pyridinium-4-yl)ethyl)-9H-carbazole-3,6-diyl) bis(ethane- 2,1-diyl) bis(1-(2-hydroxyethyl)pyridinium) iodide (THEPC) was synthesized. Photophysical experiments have shown that THEPC has large two-photon excited fluorescence action cross-sections (33 GM in the presence of DNA), which ranks THEPC as a good biological fluorophore. The results from electronic absorption, circle dichroism and single-/two-photon fluorescence emission spectra suggest that THEPC can strongly bind to DNA, with an intrinsic binding constant of 5.79 x 106 L mo1-1. THEPC has better photostability under one- or two-photon excitation conditions. Finally, the staining photos from two-photon fluorescence microscopy (TPM) show that THEPC can exclusively label the nucleus with high contrast and without image distortion. These remarkable properties and optimized imaging ability make THEPC an attractive DNA probe in TPM.