The crystal structure of ilinskite, NaCu5O2(SeO3)2Cl3, and review of mixed-ligand CuOmCln coordination geometries in minerals and inorganic compounds |
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Authors: | Sergey V Krivovichev Stanislav K Filatov Lidiya P Vergasova |
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Institution: | 1. Department of Crystallography, Faculty of Geology, St. Petersburg State University, University Emb. 7/9, 199034, St. Petersburg, Russia 2. Institute of Volcanology, Russian Academy of Sciences, Piyp Boulevard 6, 683006, Petropavlovsk-Kamchatskii, Russia
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Abstract: | The crystal structure of ilinskite, NaCu5O2(SeO3)2Cl3, a rare copper selenite chloride from volcanic fumaroles of the Great fissure Tolbachik eruption (Kamchatka peninsula, Russia), has been solved by direct methods and refined to R 1?=?0.044 on the basis of 2720 unique observed reflections. The mineral is orthorhombic, Pnma, a?=?17.769(7), b?=?6.448(3), c?=?10.522(4) Å, V?=?1205.6(8) Å3, Z?=?4. The The CuOmCln coordination polyhedra share edges to form tetramers that have 'additional' O1 and O2 atoms as centers. The O1Cu4 and O2Cu4 tetrahedra share common Cu atoms to form O2Cu5]6+ sheets. The SeO3 groups and Cl atoms are adjacent to the O2Cu5]6+ sheets to form complex layers parallel to (100). The Na+ cations are located in between the layers. A review of mixed-ligand CuOmCln coordination polyhedra in minerals and inorganic compounds is given. There are in total 26 stereochemically different mixed-ligand Cu-O-Cl coordinations. |
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