Acta Crystallographica · 1961 · 80 citations · 0 references
Natural SciencesChemistryMedicinal ChemistryCrystal StructureOrganic ChemistryStructural BiochemistryCrystal ChemistryCrystal LatticeCrystal SymmetryCrystallographyStructure DeterminationX-ray CrystallographyArsenic ChemistryAtomic Plane PackingCrystal Structure DeterminationDouble BondsMolecular Structure DeterminationMonoclinic SystemPeriodic Table OrganizationX-ray Diffraction Analysis
An X-ray diffraction study of monoclinic crystals of arsenobenzene has shown that the molecule is not a dimer, as given in many text books, but is a hexamer, As 8 ~6. The arsenic atoms are arranged in a six-membered ring which has the 'chair form'. The As-As distances are 2.456 +_ 0.005 A and the As-As-As angles average 91 . The phenyl groups are attached to arsenic atoms in the 'radial' positions. The molecule has only a center of symmetry but does not deviate greatly from the symmetry 32/m. The packing of the molecules in the crystal involves only phenyl to phenyl contacts.