issue contents

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296

December 1995 issue

Highlighted illustration

Cover illustration: Tricyclo[22.2.2.211,14]triaconta-11,13,24,26,27,29-hexaene-6,19-dione (left), see Rettig, Scheffer, Trotter & Yang, pp. 2687-2688, and 3,3,18,18-tetramethyl-1,5,16,20-tetraoxadispiro[5.8.5.8]octacosane (right), see Lewis, Rettig, Scheffer & Trotter, pp. 2688-2690. Displacement ellipsoids are plotted at the 30% probability level.

inorganic compounds


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The asymmetric unit of K3Nb3Ti2O11F4 contains two STX6 octahedra where X = O, F or OF (= 1/4 F + 3/4 O) and ST = (3/5 Nb + 2/5 Ti). The K-atom environment is similar to that in ferroelectric phases, but the weak distortion of the octahedra and the occupation of their centres by Nb5+ and Ti4+ cations result in paraelectric behaviour.

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The structure of Fe2Al3Si3 consists of a compact three-dimensional arrangement of FeM10 and FeM9 iron-centred polyhedra (M = Al or Si). Si has 9 to 11 neighbours and Al 11 or 12 neighbours at distances less than 3.1Å.

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Dicerium pentanickel dizinc, Ce2Ni5Zn2, crystallizes as a new ordered substitution variant of the Er2Co7 structure type, and cerium dinickel zinc, CeNi2Zn, crystallizes with the YRh2Si structure type.

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H9Tb7Ce6(SO4)27.72.2H2O is isomorphous with the Nd compound reported previously, but is less stable and features unexpectedly long Tb-O distances.

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The structure of Mg2B2O5 is built from tetrameric Mg4O18 chains of trans-edge-sharing Mg octahedra held together by B atoms which form B2O5 groups.

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Pr3(SiO4)2Cl is isostructural with La3(SiO4)2Cl. The structure comprises layers of Pr(2)(SiO4)4Cl2 octahedra separated in the a direction by Pr(1) cations occupying Pr(1)O7Cl polyhedral sites.

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K(VO2)3(SeO3)2 is a new layered phase based on hexagonal tungsten-oxide-like sheets of vertex-sharing VO6 octahedra. It is isostructural with NH4(VO2)3(SeO3)2.

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The structure of NaGaSi2O6 is similar to that of jadeite (NaAlSi2O6). Comparison of the structure of NaGaSi2O6 with those of eleven other NaM3+Si2O6 pyroxenes suggests that the octahedrally coordinated Ga3+ ions exist in two different electronic states.

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The structure of S4N4Cl2 has been redetermined at 120K. The results are compared with those of an earlier study using photographic data obtained at ambient temperature.

metal-organic compounds



































organic compounds


































































addenda and errata



international union of crystallography


Special and virtual issues

Acta Crystallographica Section C is planning special issues on

The Structural Chemistry of Homogeneous and Heterogeneous Catalysts

NMR Crystallography.

Full details are available on the special issues page.

The latest virtual issue, featuring Coordination polymers and with an introduction by Len Barbour, was published in July 2014.

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