|
|Section2= |Section7= |Section8= }} Hexafluorobenzene, HFB, , or perfluorobenzene is an organic, aromatic compound. In this derivative of benzene all hydrogen atoms have been replaced by fluorine atoms. The technical uses of the compound are limited, although it is recommended as a solvent in a number of Photochemical reactions. In the laboratory hexafluorobenzene is used for several purposes: * standard in Fluorine-19 NMR * solvent and standard in Carbon-13 NMR * solvent in Proton-NMR * solvent when studying some parts in the IR-spectrum * solvent in UV-spectra, as hexafluorobenzene itself hardly shows any absorbance in the UV region. == Geometry of the aromatic ring == Hexafluorobenzene in the perhalogenbenzenes stands somewhat aside. When counting for bond angles and distances it is possible to calculate the distance between two ortho fluorine atoms. Also the non bonding radius of the halogens is known. The following table presents the results:〔P. Delorme, F. Denesselle: J. Chem. Phys., jaargang 64, pagina 591 (1967).〕 The conclusion of the table is HFB is the only perhalobenzene being planar, the others all are buckled more or less. As a consequence in C6F6 the overlap between the ''p''-orbitals is optimal, while in the others it is less, also giving rise to a lower aromaticity in those compounds. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hexafluorobenzene」の詳細全文を読む スポンサード リンク
|