S. Koizumi, Y. Matsunaga
Feb 1, 1972
Citations
0
Influential Citations
11
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
The 1,6-diaminopyrene-p-chloranil complex is dark blue when crystallized from chloroform and brown when crystallized from benzene. These two substances are distinctly different in X-ray diffraction, electronic spectrum, vibrational spectrum, and also electrical resistivity. The brown form, the resistivity of which is about 105 ohm cm, can be transformed into a third form, exhibiting only a few ohm cm, by compression in the presence of benzene or some other aromatic solvents. Dimorphic forms are also found with the complexes of trichloromonobromo-and dichlorodibromo-p-benzoquinones. One of these forms is of a similar nature to the dark blue-colored p-chloranil complex. The other form is brown. Only the brown form is obtainable for the complexes of mono-chlorotribromo-p-benzoquinone and p-bromanil. All the brown complexes except that of p-chloranil are similar and exhibit resistivities of the order of 103 ohm cm. In addition, black products exhibiting resistivities of several ohm cm can be prepared by using...