U.v. photolysis of microcrystalline 5-diazoimidazole-4-carboxamide gives rise to two S= 1 species detected by e.s.r. spectroscopy, one of which is assigned to a radical-pair (r⊥= 3.14 Å) while the other displays resonances indicative of a large D parameter typical of a carbene structure, supporting conclusions from solution photolysis.
H. B. Ambroz, B. T. Golding, T. J. Kemp and V. S. Shukla, J. Chem. Soc., Chem. Commun., 1982, 414 DOI: 10.1039/C39820000414
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