几种芴衍生物(有机材料增感剂)的13C核磁共振研究

利用FX-60Q脉冲付里叶变换核磁共振波谱仪(磁场强度为14093高斯,观察频率为15.04MH_z)测定了四种劳衍生物的非去偶谱、偏共振谱和质子完全去偶谱。借助于偏共振技术、质子噪声(宽带)去偶、取代基化学位移加合规则以及模式化合物比较,确定了各峰的化学位移和一键、二键及三键偶合常数。实验结果表明,用化学位移和偶合常数的值除帮助识别各峰的归属外,还能推断未知化合物的碳键状态及取代基电负性的大小,对鉴别化合物结构可提供有用的线索。

13C NMR STUDY OF SEVERAL FLUORENE DERIVATIVES (ORGANIC MATERIAL SENSITIZER)

In this treatise the ¹³C NMRresearches of 2,4,7-trinitrofluorenone, 9-dicyanomethylene-2,4,7-trinitrofluorene, 2,4,5,7-tetranitrofluorenone and 9-dicyanomethylene-2,4,5,7-tetranitrofluorene have been made.The ¹³C-¹H coupled,the proton off-resonance decoupled and the decoupled NMRspectra for four fluorene derivatives are obtained at the FX-60 Q PFT-NMRspectrometer (the magnetic field intensity being 14093 G, the observation frequency being 15.4 MHz). With the aid of the techniques of proton off-resonance decoupling, broad band decoupling, and the substituent chemistry shift additivity rules and by the model compound comparison,the chemical shifts and coupling constants of all peaks observed have been determined.The experimental results show, according to chemical shift and coupling constants, that the belonging of different peaks can be recognized and bonded states of unknown compound and substituent electronegativity value can be judged. Therefore, a useful clue may be provided for distinguishing various structures of compounds.