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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?]

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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.

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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.

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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.

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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.
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