摘要:
The crystal structure of 1,10-diazonia-18-crown-6 picrate (1) was determined in an X-ray diffraction study: space group P (1) over bar, a = 10.516(2), b = 11.595(2), c = 15.470(3) Angstrom, alpha = 78.74(2), beta = 70.31(2), gamma = 64.38(2)degrees, Z = 2. The structure was solved by direct methods. The full-matrix least-squares refinement was performed anisotropically to R = 0.060 for all 5275 unique reflections collected (CAD-4 automatic diffractometer, lambdaMoK(alpha)). In crystal, compound (salt) I exists as individual complex (ionic) molecules [H(2)DA18C6](2+).2Pic(-) formed by N-H...O type hydrogen bonds and counterion electrostatic attraction forces. In the unit cell of crystal 1, there are two such centrosymmetric and crystallographically independent molecules; the constituent molecular ions are slightly disordered. The DA18C6 dications exist in two-angle form, which is their typical conformation.