光谱技术在星型拓扑分子结构鉴定中的应用

It is necessary to use matrix assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS) technology to detect accurately the molecular weight of star-shaped topological molecules with hexachlorocyclotriphosphazene as the "nucleus". Therefore a new method combining ultraviolet-visible spectroscopy and fluorescence spectroscopy is developed to characterize the topological structure of star-shaped luminescent hyperbranched compounds in stead of MALDI-TOF-MS. Hexa-[9-(4-biphenoxy) anthryl] cyclotriphosphazene (HBACP) is used as the model compound, and anthracene is used as the contrast. Detection results show that the ratio of the absorbance of HBACP to anthracene at the same molar concentration is about 6, and the ratio of the integrated area of absorption peak and the ratio of the integrated area of emission peak are also near 6. Therefore, it can be presumed that the molecular structure of HBACP contains 6 anthracene groups attached to cyclotriphosphazene core. The molecular weight of HBACP determined by MALDI-TOF-MS technology is 2 206.9, which is consistent with the theoretical calculation value m/z=2 206.7 of ChemDraw software. Spectral speculation results are consistent with mass spectrometry results. The results show this method does not rely on MALDI-TOF-MS expensive instruments and equipment, and has the characteristics of high efficiency, accuracy and low cost.