Abstract:

The Crystal structure of 1,4-Biphenoxybenzene (Ⅰ) and 1,4-Bis (4-Methoxyphenoxy) benzene (Ⅱ) have been determined by X-ray diffraction method. For compound (Ⅰ) , the space group is P2_1/c; Its cell parameters are:a=5.876(2), b=7.832(2),c=6.5455(6)nm; β=95.33(3)~0; z=2.For compound (Ⅱ), the space group is Pcab; Its cell parameters are:a=6.017(1),b=7.577(1), c=3.6404 (5)nm;z=4.
The bond lengths,bond angles and molecular conformation indicate that:in these polyphenoxy benzene systems the conjugative polarization effect can not pass through the oxygen bridge to cover the whole molecule,
Such a strutctural feature explaines its small slope of the homologous line for absorption peaks of polyphenoxy benzene series.