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February 2002 issue
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Cover illustration: 1'-Acetylferrocene-1-carboxylic acid: an instance of hydrogen bonding in the rare dimeric acid-to-ketone mode. Displacement ellipsoids are plotted at the 20% probability level. See Newman, Papadakis, Thompson & Lalancette [Acta Cryst. (2002), C58, m89-m91].
inorganic compounds
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The structure of Pb2HgCrO6 consists of isolated [CrO4]2− tetrahedra, [HgO2]2− dumb-bells and stereochemically active Pb2+ ions with coordination 3+5.
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In Bi2B8O15, the Bi atom is coordinated to five or six O atoms. The B atoms exhibit two kinds of hybridization, sp2 and sp3, seen in the BO3 triangles and BO4 tetrahedra, respectively. Three BO3 triangles are connected to form a B3O6 planar ring. All atoms in the structure are connected together to form an infinite three-dimensional network.
metal-organic compounds
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The structure of the polyoxomolybdate [Na
(H2O)16(NH2CH2COO)
]4+·{Na+[H9Mo
Mo
O56(NH2CH2COO)
]5−}4−·20H2O is reported. The 18 Mo atoms connected by O atoms form a centrosymmetric girdle-like structure, in which MoV–MoV units are found. An Na+ cation occupies the central hole of the girdle, while four Na+ cations are bonded to O atoms on the girdle edge. The girdles are linked into a one-dimensional chain by the remaining Na+ cations.
![_{6}^{+}](/c/issues/2002/02/00/ta1340/teximages/ta1340fi1.gif)
![_{2}^{-}](/c/issues/2002/02/00/ta1340/teximages/ta1340fi2.gif)
![_{10}^{\rm VI}](/c/issues/2002/02/00/ta1340/teximages/ta1340fi3.gif)
![_{8}^{\rm V}](/c/issues/2002/02/00/ta1340/teximages/ta1340fi4.gif)
![_{2}^{-}](/c/issues/2002/02/00/ta1340/teximages/ta1340fi2.gif)
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organic compounds
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