Cl??(Ar), Cl?Cl, and other intermolecular interactions in the crystal structure of 8-nitro-6-methyl-2-trichloromethyl-4-dichloromethylene-1,3-benzodioxin
作者:Anne Irving
DOI:10.1007/bf01187275
日期:1993.9
Crystals of the title compound are monoclinic, P2(1), a = 9.791(4), b = 7.129(3), c = 10.428(3) Angstrom, beta = 91.84(3)degrees, V = 727.501 Angstrom(3), Z = 2. The structure was solved by direct methods, from data collected at room temperature on an Enraf-Nonius CAD4 diffractometer, and refined by full matrix least squares to a final Ii value of 0.045 using 2466 reflections. The molecules form stacks along the b axis of the form A, B, A, B (A = dichloromethylene group; B = aromatic ring in the molecule at -x, 1/2 + y, -z to the molecule at x, y, z containing A). Cl...pi(Ar), pi...pi, Cl...Cl, Cl...O(N), (Cl3C)H...O intermolecular interactions are also present. An inverse correlation between the (C)Cl...Cl(C) distance and the difference in the corresponding pairs of C-Cl...Cl angles is observed and is interpreted in terms of incipient nucleophile:electrophile attack.