X-ray crystallographic studies on cycloheptadithiophene compounds and similar systems. X. The crystal structure of dithieno[1,2-b:5,4-b']tropylium tetrafluoroborate at 143 and 295 K

Abstract

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.