1983年1月1日 · 31 P and 19 F NMR spectroscopy has been used to elucidate the nature of the interaction of PF 5, HPO 2 F 2 and P 4 O 10 with the solvent system 44 wt.% N 2 O 4 in 100% …

F3最高场且变化范围大, 高场可达-220ppm, 碳上连接金属 原子时较高场, 连接卤素和氧原子时稍低; F1低场. 当双 键上只有一个氟时化学位移变化更大, 低场可达-53ppm. 规律性较差, 分析谱图时 …

Berry pseudorotation influences the 19 F NMR spectrum of PF 5 since NMR spectroscopy operates on a millisecond timescale. Electron diffraction and X-ray crystallography do not …

single 19F NMR signal for PF5 at room temperature, the infrared spectrum is consistent only with the D3h structure. rine atoms can exchange with one another so rapidly? The accepted exp

2006年2月13日 · For the first time, theoretical evidence that confirms the importance of the Berry pseudorotation process in the interpretation of the 19F NMR spectrum of phosphorus …

19 F NMR spectroscopy of the PF 5 /3-oxabicyclo [3.2.2]nonane system Giulio Ceccarelli, Fulvio Andruzzi

1986年12月1日 · We observe that axial and equatorial F isotropic shieldings in PF5 differ by only 7 ppm. This difference is minute compared to the range of more than 1000 ppm observed for F …

2006年2月6日 · Fluxional effects in PF5 can be included using ab initio molecular dynamics for the theoretical determination of 19 F NMR parameters that are in agreement with experiment.

1989年12月1日 · At room temperature the 19F-NMR spectrum of the PF~-GIC shows a doublet (Fig. i) caused by spin-spin interaction among the fluorine and phosphorus nuclei with a …

2006年2月13日 · For the first time, theoretical evidence that confirms the importance of the Berry pseudorotation process in the interpretation of the 19F NMR spectrum of phosphorus …