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May 1997 issue

Cover illustration: -1H-1,2,3,4-Tetrazole, see Goddard, Heinemann and Krüger, pages 590-592.
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K2[Ni0.93Fe0.07(H2O)6](SO4)2 has a typical Tutton's Salt structure [see e.g. Acta Cryst. (1964), 17, 1295–1299; 1478–1479]. It is isomorphous with the pure nickel complex, K2[Ni(H2O)6]- (SO4)2, described previously from neutron studies [Cryst. Struct. Commun. (1975), 4, 713–716] with 7(2)% of the Ni atoms replaced by Fe atoms.
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The structures of [Co(NO2)(NH3)5]X2 (X = Cl, Br) at 290K and 150K were determined using the same crystal in each case as part of a study of the anisotropy of structural distortion in cobalt(III) nitroammine complexes induced by changes in temperature or pressure, substitution of anions or linkage isomerization in the cation.
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The structure of [Co(NO2)(NH3)5]Cl(NO3) was determined at 290K and 150K using the same crystal as part of a study of the anisotropy of structural distortion in cobalt(III) nitroammine complexes induced by changes in temperature or pressure, substitution of anions or linkage isomerization in the cation.
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Li2V6O13 is found to be the first phase formed (at 2.65V versus Li+/Li) on electrochemical lithiation of V6O13. Lithiation causes a 7.6% expansion of the c axis, but the space group of Li2V6O13, C2/m, is the same as that of V6O13.
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β-BaTbF6 is isostructural with β-BaZrF6. The structure is built from [TbF8]4− dodecahedra sharing edges to form infinite chains running along [100]. The chains are linked together by the Ba2+ ions.
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The trimetaphosphimate anion in Na3(PO2NH)3.H2O exhibits a chair conformation. The anions are linked to form pairs by N—H⋯O hydrogen bonds. The pairs of anions are further linked by O-H⋯O hydrogen bonds involving the water molecules to form columns.
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SrSiO3 is composed of alternate layers of ternary rings of SiO4 groups and layers containing two different types of SrO8 polyhedra stacked along [001].
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addenda and errata
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Erratum to Acta Cryst. (1996), C52, 3213–3215.