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ESR. Study of an X‐Irradiated Single Crystal of Methylene Diarsonic Acid
Author(s) -
Geoffroy Michel,
Llinares Antoine
Publication year - 1981
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19810640133
Subject(s) - chemistry , hyperfine structure , methylene , radical , irradiation , electron paramagnetic resonance , ion , single crystal , annealing (glass) , spectroscopy , crystallography , photochemistry , medicinal chemistry , nuclear magnetic resonance , organic chemistry , physics , materials science , quantum mechanics , nuclear physics , composite material
X‐Irradiation of single crystals of methylene diarsonic acid gives rise to a variety of radicals which have been identified by ESR. spectroscopy; (OH) 2 As(O)CHAs(O) (OH) 2 , − OÅs(OH) 2 CH 2 As(O)(OH) 2 , AsO 3 – and (OH)Ås(O)CH 2 As(O)(OH) 2 . The spin densities have been obtained from the 75 As‐hyperfine tensors. An additional species ‐ probably a radical anion localized on a pentacoordinated arsenic ‐ is also detected after annealing at room temperature. The radiation damage process is discussed.