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Abstract
The crystal structure of Hg4As2I3 (Pa[unk]) has been solved and refined to R = 0.030 (Rw = 0.038) for 565 unique observed reflections. The framework, isostructural to that of Cd4As2I3, is described either as a pseudo-cubic close packing of Hg atoms with As and I in the interstices or as a complex arrangement of two sorts of polyhedra surrounding Hg, sharing corners or edges. The cohesion of the structure is assumed to be due to As atoms with strong bonds As – Hg and As – As. A discussion about Hg – I distances is proposed, involving a iono-covalent character to the corresponding bond.
Published Online: 2010-08-25
Published in Print: 1989