Crystal structure of the synthetic analog of radtkeite Hg₃S₂Cl_1.00I_1.00

Authors: Pervukhina, N.¹; Borisov, S.²; Magarill, S.²; Naumov, D.²; Vasiliev, V.³; Nenashev, B.³

Source: Journal of Structural Chemistry, Volume 45, Number 4, July 2004 , pp. 720-723(4)

Publisher: Springer

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Abstract:

The results of structural studies of the synthetic analog of the radtkeite mineral Hg₃S₂Cl_1.00I_1.00 are analyzed. The crystal structure of the compound has been refined; the unit cell parameters are a _m = 16.827(4) Å, b _m = 9.117(1) Å, c _m = 13.165(5) Å, beta

= 130.17(2)°, V = 1543.3(8) Å³, space group c2/m, Z = 8, R = 0.0527. A possible transition a ₀ = a _m; b ₀ = a _m + 2c _m; c ₀ = -b _m to the pseudo-orthorhombic F cell previously determined for radtkeite, where one of the angles ( gamma

₀ ) is slightly different from 90° (89.55°), has been found. Each sulfur atom in the structure is bonded to three mercury atoms, forming SHg₃ umbrellas with distances 2.240(6) Å–2.474(8) Å and angles HgSHg 94.7(2)°–102.9(2)°. The SHg₃ fragments are linked through Hg vertices to form corrugated [Hg₁₂S₈] infin

layers. The halogen atoms lie inside and between the [Hg₁₂S₈] infin

layers; the distances are Hg-Cl and Hg-I 2.783(7) Å, 2.961(7) Å, and 3.083(4) Å–3.311(3) Å, respectively.

Keywords: mercury chalcogen halides; mercury minerals; crystal structure; X-ray diffraction analysis

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10947-005-0050-5

Affiliations: 1: A. V. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Email: pervukh@che.nsk.su 2: A. V. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 3: United Institute of Geology, Geophysics, and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk,

Publication date: 2004-07-01