%0 Journal Article
%T Redetermination of Hg2I2
%A Mohammed Kars
%A Thierry Roisnel
%A Vincent Dorcet
%A Allaoua Rebbah
%J Acta Crystallographica Section E
%D 2012
%I International Union of Crystallography
%R 10.1107/s1600536811056339
%X The crystal structure of mercurous iodide, Hg2I2, has been determined previously from X-ray powder diffraction data [Havighurst (1926). J. Am. Chem. Soc. 48, 2113¨C2125]. The results of the current redetermination based on single-crystal X-ray diffraction data provide more precise geometrical data and also anisotropic displacement parameters for the Hg and I atoms, which are both situated on positions with site-symmetry 4mm. The structure consists of linear dimers I¡ªHg¡ªHg¡ªI extending along the c axis with an Hg¡ªHg distance of 2.5903 (13)  . The overall coordination sphere of the Hg+ atom is a considerably distorted octahedron. The crystal specimen under investigation was twinned by non-merohedry with a refined twin domain fraction of 0.853 (14):0.147 (14).
%U http://scripts.iucr.org/cgi-bin/paper?S1600536811056339