ESR study of a brominehyphen;containing radical in ggr;hyphen;irradiated bromomalonamide

摘要

Both powder and singlehyphen;crystal ESR spectra of two paramagnetic species formed by ggr;hyphen;irradiation of bromomalonamide at 77deg;K have been obtained. One radical shows a large bromine hyperfine interaction plus a small proton interaction and theg,A(81Br) ande2qQ(81Br) tensors have been determined from an analysis of the spectra of the deuterated form. The data have been interpreted as favoring the structure middot; CHBrCONH2for this species. The second fragment has been identified as CONH2, but ESR parameters are not reported since it has been studied previously. Neither species is stable at room temperature in the host crystal.