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[reaction: see text]. The EPR observation of a ground-state quintet hetero-spin molecule, N-(2-methoxycarbonyl-2-yloethyl) (3-nitreno-phenyl)aminyl 3, in a MTHF matrix at cryogenic temperatures is reported. The molecule has two different kinds of triplet sites, and the ZFS parameters of the quintet are /D/hc/ = 0.170 cm(-1) and /E/hc/ = 0.004 cm(-1). As a result of the nature of the 1,3-localized biradical, the quintet 3 was thermally labile over 5 K.
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Hideyuki Tukada (2001) studied this question.
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