1991
DOI: 10.1002/zaac.19915950118
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Die Kristallstruktur von 2CaCl2 · 11HgCl2 · 16H2O, eines kubischen, quecksilberreichen Chloromercurats mit ikosaedrischen Hg6Cl13‐ und Hg5Cl13‐Baugruppen

Abstract: Das quecksilberreiche Chloromercurat 2CaCl2 · 11HgCl2 · 16H2O ist durch Kristallisation aus konzentrierten wäßrigen Lösungen von CaCl2 und HgCl2 bei Raumtemperatur zu erhalten. In der kubischen Kristallstruktur (a = 18,170(3) Å, Raumgr. F23, Z = 4) bilden Hg6Cl13−‐ und Hg5Cl133−‐Anionen ein Gerüst mit großen Hohlräumen, in denen sich Ca(H2O)82+‐Kationen mit dodekaedrischer Konformation befinden. Von den 104 Cl‐Atomen in der Zelle bilden 96 einen Bauverband cP2[12i] mit acht Cl12‐Ikosaedern, die jeweils durch e… Show more

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Cited by 6 publications
(4 citation statements)
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“…Prior work noted the slow kinetics of Fe-ettringite formation (180 days to reach equilibrium) relative to Al-ettringite, and the initial formation of ferrihydrite and gypsum in Al-free systems. 10,11 There is also uncertainty in both the stoichiometries and solubilities of hydrated Ca–Fe hydroxysulfate phases that may form at high pH, 39,40 which would change the positions of the stability fields shown in Figure 4B. In the Fe-cpt without Hg, a Ca–Fe-sulfate-hydrate phase (of different stoichiometry than the phase used in the thermodynamic database) and calcite (as a minor phase) were identified as reaction products by XRD.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…Prior work noted the slow kinetics of Fe-ettringite formation (180 days to reach equilibrium) relative to Al-ettringite, and the initial formation of ferrihydrite and gypsum in Al-free systems. 10,11 There is also uncertainty in both the stoichiometries and solubilities of hydrated Ca–Fe hydroxysulfate phases that may form at high pH, 39,40 which would change the positions of the stability fields shown in Figure 4B. In the Fe-cpt without Hg, a Ca–Fe-sulfate-hydrate phase (of different stoichiometry than the phase used in the thermodynamic database) and calcite (as a minor phase) were identified as reaction products by XRD.…”
Section: Discussionmentioning
confidence: 99%
“…Chloromercury salts exhibit a wide structural diversity and variable composition . Although most structural characterization has been performed on organo-Hg salts, Hg x Cl y n – stoichiometries were identified in inorganic salts, such as the “double salt” [CaCl 2 ] 2 [HgCl 2 ] 11 •16H 2 O containing [Hg 6 Cl 13 – ]­[Hg 5 Cl 13 3‑ ] clusters, or the MgHg 3 Cl 8 salt . A range of Hg–Cl distances have been reported, depending on whether Cl is bridging between Hg atoms, with longer distances in general when Cl acts as a bridge .…”
Section: Discussionmentioning
confidence: 99%
“…In compound 1 a, 12 Br atoms form an almost perfect icosahedron with crystallographic m3 (T h ) symmetry and surround a central Br ion reminiscent of the {Hg 5 Cl 13 } arrangement in Hg 11 Ca 2 Cl 26 (H 2 O) 16 . [8] The 20 triangular faces of the Br icosahedron are capped by the 8 lone pairs of the Te atoms forming a cube and 12 lone pairs of the closer of the two Te (Figure 5 a). The refined composition of the cavity is [Ni 3.39 Br 12.14 ] 5.36À , thus implying that only three or four Ni atoms reside in any given cavity and that there is a slight deficit of Br ions (12.1 versus 13).…”
Section: Host-guest Systemsmentioning
confidence: 99%
“…The situation inside the cavities is both more complex and more variable than that in the host network. In compound 1 a , 12 Br atoms form an almost perfect icosahedron with crystallographic m 3 ( T h ) symmetry and surround a central Br ion reminiscent of the {Hg 5 Cl 13 } arrangement in Hg 11 Ca 2 Cl 26 (H 2 O) 16 8. The 20 triangular faces of the Br icosahedron are capped by the 8 lone pairs of the Te atoms forming a cube and 12 lone pairs of the closer of the two Te icosahedra.…”
Section: Elemental Analysis For 1 a 1 B And 2[a]mentioning
confidence: 99%