Synthesis and Characterization of a Diiminoxyl Derivative of 2,4-Hexadiyne-1,6-Diol

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Abstract
Two polymorphs of 2,4-hexadiyne-1,6-diyl bis(2,2,5,5-tetramethyl-1-oxyl-3-pyrroline-3-carboxylate) have been prepared and characterized by X-ray diffraction, infrared, Raman, and EPR spectroscopies, and magnetic susceptibility. Based upon accepted structural criteria, both polymorphs should not support single crystal topochemical polymerization; UV, electron beam, and gamma ray induced polymerization has not been achieved for either phase. Thermal treatment, however, turns the crystals black, but magnetic susceptibility studies show no anomalous behavior characteristic of ferromagnetism.