Abstract(C~tHTS2)+BF; is triclinic, space group PL with a = 7. 1949 (12), b = 8.7203 (12), c = 9.5967 (20) A, a= 105.787 (15), # = 99.074 (13), ~, = 96.817 (13) ° at 143 K, Z = 2. The structure was refined to an R of 0.043 for 1448 non-zero counter reflexions at 143 K. The cation is almost planar; the angle between the planes of the two thiophene rings is 175.3 (4) ° . Aromatic character is indicated by the relatively uniform C-C lengths. The S-C bonds are equal. The BF; ion is disordered and has been described by two different orientations.
The structure of a 1 : 1 compound between ammonium P,P-dithiophosphacyanurate and urea has been solved by direct methods and refined by full-matrix least-squares calculations to a final R of 0.029 for 1891 observed reflexions. The structure is triclinic, space group P]', with a=5.0187 (2), b=9.9219 (3), c= 11"9417 (5) &, e=71.108 (6),/?=85.529 (7),),=81.222 (13) °, Z=2, and consists of urea molecules, ammonium ions and cyclic anions with the formula C2HaN302PS~-. The anions contain a non-planar 6-membered ring C2N3P. The S and O atoms in the anions are acceptors of hydrogen bonds, linking the different moieties into a three-dimensional network.
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