H. Suzuki et al., OPTICAL-PROPERTIES, THERMOCHROMISM AND CRYSTAL-STRUCTURE OF PICRIC ACID-1,5-DIAMINONAPHTHALENE SALT, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 285, 1996, pp. 621-626
The crystal structure of the 2:1 salt of picric acid with 1,5-diaminon
aphthalene has been determined by the X-ray diffraction method. The cr
ystals of the salt have the yellow green form. The crystals exhibit th
e thermochromism at about 110 degrees C. This phenomenon was studied b
y measuring the temperature dependence of the IR absorption spectra of
the crystals of the salt of picric acid with 1,5-diaminonaphthalene a
nd the deutrated salt.