H11 I N2 O6 Helmholz L Journal of the American Chemical Society 59 (1937) 2036-2039 The Crystal Structure of Ammonium Trihydrogen Paraperiodate, (NH4)2 H3 I O6 _cod_database_code 1010098 _database_code_amcsd 0017031 6.88 6.88 11.10 90 90 120 R-3 atom x y z N1 0 0 .34 I1 0 0 0 O1 .232 .216 .105