Changes in space and Laue groups of some published crystal structures

Abstract

It is noted that the crystal structures of eight compounds can almost surely be described in space groups having higher Laue symmetry than reported in the original papers. In three instances the lattice symmetry remains unchanged; there is one change from triclinic to monoclinic and four from monoclinic to rhombohedral. Of special significance are the structures of benzene. C12 and benzene. Br 2, where the earlier monoclinic descriptions were not compatible with spectroscopic evidence; the evidence should now be reexamined in terms of the rhombohedral descriptions.

Improved photovoltaic response of a near-infrared sensitive solar cell by a morphology-controlling seed layer

“…The high similarity of the two phases gives rise to similar absorption features, with the most intense Q-band located between 500 -750 nm 21,27 . On the contrary, non-planar Pc materials, including PbPc, ClAlPc, TiOPc, VOPc and ClInPc, exhibit vastly different polymorphs, which are assigned as monoclinic phase and triclinic phase [28][29][30] . Monoclinic form consists of molecules stacking in a face-to-face fashion, giving rise to metal ions in a linear chain 28,31 .…”

Bergslagite, a mineral with tetrahedral berylloarsenate sheet anions

“…Finally, the atomic positions in Pi differ from the higher symmetry only by a few e.s.d. 's and this is the crucial indication that the higher symmetry of the structure and diffraction pattern should be chosen (Herbstein and Marsh, 1982). As a result of the lattice geometry there are not less than eight possible twin laws and at least two were observed on large (Dunn et al, 1979).…”

A micro-computer program to detect higher lattice symmetry

“…This matrix can be typed directly at the *The critical paper by Jones (1984), the reading of which is highly recommended, deals with this topic. Several cases of changes in crystal systems have been discussed by Herbstein & Marsh (1982).…”