Crystal chemistry of mercury(I) and mercury(I, II) minerals |
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Authors: | N. V. Pervukhina G. V. Romanenko S. V. Borisov S. A. Magarill N. A. Palchik |
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Affiliation: | (1) Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Russia;(2) United Institute of Geology, Geophysics, and Mineralogy, Siberian Branch, Russian Academy of Sciences, Russia |
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Abstract: | The crystal structures of 16 mercury(I)- and mercury(I, II)-containing minerals having (Hg-Hg)2+ groups are considered. The Hg-Hg and Hg-X bond lengths and the HgHgX angles (X = Cl, Br, I, O, S) are analyzed. A comparative crystal chemical analysis of the environment of Hg atoms is carried out. The Hg-Hg and Hg-X distances vary within 2.43-2.60 and 1.93-2.43 å, respectively; the angles defining the deviation of the X-Hg-Hg-X groups from linearity are from 146 to 177?. In most cases, the coordination environment of the mercury atoms involves the metal atom of the (Hg-Hg)2+ dumbbell and the X atom, but in several compounds the coordination number of the mercury atoms increases due to the additional atoms lying 2.5–3.5 å away. In terlinguaite and kuznetsovite, the Hg3 triangle is rather unusual; in the latter mineral, the Hg-Hg bonds are lengthened to 2.64-2.70 å. The review covers structural data up to May 1997. |
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