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Electron Spin Resonance of y-Irradiated Dicyandiamide

The X-band e.s.r. spectra of single crystal and powder samples of y-irradiated dicyandiamide, (H2N)2CNCN, have been observed. The results show that three radical species are formed on irradiation at room temperature. One of these radicals, which gives a single broad line spectrum of width 8.5 G and g = 2.0040, has not been identified. The other two species are considered both to have the same chemical formula NH2C(NH)NCN but one is a n-electron radical whereas the other is a o-electron radical with a very large proton hyperfine splitting in the range of 73-81 G. The production of two types of radicals by radiation damage to the same -NH2 group of dicyandiamide is explained in terms of the ease of formation of nand o-electron radicals as influenced by geometrical considerations stemming from the hydrogen bonding in the dicyandiamide crystal.