research papers
In the crystal structures of two crown-ether-coordinated caesium halogen salt hydrates, hydrogen bonds between bromide ligands and water molecules lead to one-dimensional chains running along the b axis in one compound, whereas two-dimensional sheets of water molecules and chloride ligands are formed which combine with the polymeric caesium–crown polymer to give a three-dimensional network in the other complex. Although both compounds have a similar composition, i.e. a Cs+ cation with a halogen, an 18-crown-6 ether and a water ligand, the crystal structures are rather different. [OK?]
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
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.
research papers
The structures of eight benzoylhydrazones show similar conformations and hydrogen-bonding patterns. In most cases, the phenyl ring of the benzoyl group is rotated by about 30° with respect to the keto group. Only one of the amide groups exhibits the syn conformation.
research papers
Si2Br6 and Si2I6 were prepared through dephenylation of hexaphenyldisilane with acetyl bromide or acetyl iodide in the presence of the corresponding aluminium halide. It is interesting to note that Si2Br6 and Si2I6 do not form isomorphous structures. Moreover, an orthorhombic polymorph of the present structure of Si2I6 is already known. Although the title compounds feature such small and simple molecules they show completely different crystal structures.