THE STRUCTURAL EFFECT OF POLYPHENOXY BENZNE COMPOUNDS-THE CRYSTAL STRUCTRE OF 1,4-BIPHENOXYBENZENE AND 1,4-BIS(4-METHOXYPHENOXY) BENZENE

The crystal structure of 1,4-Biphenoxybenzene (I) and 1,4-Bis (4-Methoxy-phenoxy) benzene (II) have been determined by X-ray diffraction method. For compound (I), the space group is P-2/c, Its cells parameters are:a = 5.876(2), b = 7.832(2), c = 65.455(6)angstrom, beta = 95.33(3)degrees, z=2. For compound (II), the space group is Pcab, Its cell parameters are: a = 6.017(1), b = 7,577(1), c = 36,404 (5) angstrom, 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 structural feature explains its small slope of the homologous line for absorption peaks of polyphenoxy benzene series,