title: 4-Nitro-1-[(trimethyl-sil-yl)ethyn-yl]benzene: low-temperature polymorph at 100 K.
abstract: The title compound, C(11)H(13)NO(2)Si, is a low-temperature form of the previously reported room-temperature structure [Garcia et al. (1998 ▶). Acta Cryst. C54, 489-491]. At 298 K, the material crystallizes in the space group Pnma and occupies a crystallographic mirror plane, but at 100 K the space group changes to P2(1)2(1)2(1), the volume decreases by 5% and the mol-ecule distorts. The greatest mol-ecular distortions from C(s) symmetry are rotations of the trimethyl-silyl and nitro groups by 10.56 (8) and 11.47 (9)°, respectively, to the benzene mean plane. At low temperature, the crystal also becomes an inversion twin, the refined ratio of the twin components being 0.35 (15):0.65 (15).
authors.affiliation: Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803-1804,  USA.
authors.forename: Jasmine N
authors.initials: JN
authors.lastname: Millican
authors.forename: Frank R
authors.initials: FR
authors.lastname: Fronczek
authors.forename: Steve F
authors.initials: SF
authors.lastname: Watkins