research papers
Tetrabutylammonium tetrachloridoaluminate benzene hemisolvate crystallizes with discrete cations, anions and solvent molecules, and the benzene molecule is located on a centre of inversion. Tetraethylammonium tetrachloridoaluminate also crystallizes with discrete cations and anions, and forms crystals which appear trigonal but are actually orthorhombic. With the additional reflections of the second and third domains of this nonmerohedral twin, a trigonal lattice is emulated, although the correct crystal system is orthorhombic.
research papers
The crystal structures of three products of the reaction of 2-phenylphenol and BCl3 have been determined. The structures show intriguing packing patterns and an interesting case of pseudosymmetry. In addition, one of the two polymorphs has a primitive monoclinic crystal system, but it is twinned and emulates an orthorhombic C-centred structure.
research papers
Crystals of hexa-tert-butyldisilane undergo a reversible phase transition at 179 (2) K. The space group changes from Ibca (high temperature) to Pbca (low temperature), but the lattice constants a, b and c do not change significantly during the phase transition. In a new polymorph of 1,1,2,2-tetra-tert-butyl-1,2-diphenyldisilane, two independent molecules have rather similar conformations.
research papers
In two polymorphs of the tetrahydrofuran disolvate of 2,5-[(diphenylphosphanyl)methyl]-1,1,2,4,4,5-hexaphenyl-1,4-diphospha-2,5-diboracyclohexane and a pseudo-polymorph of the toluene solvate, the crystal packings are significantly different, but, surprisingly, their molecular conformations are the same.