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March 2002 issue
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Cover illustration: The cation of hexakis(pyrazole-N2)copper(II) bis(hexafluoroarsenate). Displacement ellipsoids are plotted at the 50% probability level and H atoms have been omitted for clarity. See Otieno, Blanton, Hatfield, Asher & Parkin [Acta Cryst. (2002), C58, m182-m185].
inorganic compounds
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Rubidium manganese hexathiodiphosphate, Rb2MnP2S6, crystallizes in a structure typical of compounds of the type A2MP2Q6 (A = K, Rb, Cs; M = Mn, Fe; Q = S, Se). Its structure can be viewed as columns of [MnP2S6]2− polyhedra parallel to the a axis, interconnected by Rb+.
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The structure of the low-temperature form of barium tetraphosphate shows the tetraphosphate to exist in an S conformation.
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The tetragonal polymorph of caesium hydroxide monohydrate, CsOH·H2O (or CsH3O2), a clathrate hydrate, contains an infinite three-dimensional hydrogen-bonded oxygen framework that is locally identical to layers found in the hexagonal modification.
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SrMn(SeO3)2 is built up from sheets of irregular MnO5+1 units and pyramidal SeO3 groups, sharing vertices and edges. Nine-coordinate Sr2+ cations complete the structure.
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The structure of HgWO4 consists of zigzag chains of edge-sharing WO6 octahedra running along the c axis and layers of corner-sharing HgO6 octahedra in the bc plane.
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The crystal structure of Hg3AlF6O2H has been determined at room temperature. It comprises [HgO2F6] polyhedra and [AlF6] octahedra. Assumed hydrogen bonding between two O atoms, with O⋯O = 2.562 (9) Å, provides additional bonds in the framework.
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The structure of a new variant orthorhombic Rb3Ta5O14 phase with Pnma symmetry was identified from a half sphere of synchrotron X-ray data measured at a wavelength of 0.85 Å.
metal-organic compounds
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organic compounds
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