Abstract
Abstract The crystal structure at room temperature of the complexe salt 4-aminocinnamic acid cadmium chloride (HOOC‒CH˭CH‒(C6H4)‒NH3)2 CdCl4 has been solved by X-ray diffraction method. The structure exhibits bidimensional arrangement with alternated inorganic-organic layers, in a monoclinic symmetry P21/m: a = 0.5389(1) nm; b = 3.0165(7) nm; c = 0.6999(3) nm; β = 104.09(3)°. Structural considerations allow to explain the photoinactivity (polymerization) of the compound at room temperature upon irradiation with UV light in contrast to some similar butadiene derivatives which undergo a stereospecific 1,4-addition reaction. Thermal investigations by powder X-ray diffraction and calorimetric methods show during heating process, an exothermic irreversible transformation in the solid state at high temperature concurrently with the disappearance of the tridimensional organization in the structure. A complete interpretation of this phenomenon needs further complementary investigation.
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