issue contents

Journal logoSTRUCTURAL
ISSN: 2053-2296

November 2004 issue

Highlighted illustration

Cover illustration: The structure of praseodymium hexa­cyano­ferrate(III) tetrahydrate, viewed along the a axis. See Langer, Smrcok & Masuda [Acta Cryst. (2004), C60, i104-i106].

inorganic compounds

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Ca[Ag2(SCN)4]·2H2O contains eight-membered Ag4S4 rings bonded together through shared atoms to form layers parallel to (100). The thio­cyanate groups link the layers to Ca–O chains running parallel to the c axis.

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The title compound crystallizes with the cyano groups forming a regular octahedral arrangement around the Fe atom. The Pr atom is eight-coordinated by six N atoms and two symmetry-related water mol­ecules. The second (uncoordinated, symmetry independent) water mol­ecule forms a hydrogen-bonded network with N atoms.

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The ambient-temperature form of Tl2SO4, β-Tl2SO4, is isostructural with β-K2SO4 and consists of isolated SO4 tetrahedra linked by two non-equivalent Tl atoms, which present a low stereochemical activity of their 6s2 pairs.

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The crystal structures of two new quaternary compounds, viz. dicerium orthosilicate selenide and dicerium orthosilicate telluride, Ce2(SiO4)Q (Q = Se or Te), have been determined from single-crystal X-ray diffraction data. Each structure comprises infinite chains of SiO4 tetrahedra separated by Ce and Q atoms. The site symmetries are Ce m and 2, Si 2 and Q m. The O atoms are in general positions.

metal-organic compounds

organic compounds

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.

What are the 'most read' articles from the recent special issues?

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