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Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296

October 2016 issue

Highlighted illustration

Cover illustration: Acetic anhydride is a widely used acetyl­ation reagent in organic synthesis. The crystal and mol­ecular structure, as determined by single-crystal X-ray analysis at 100 K, is reported for the first time. The mol­ecule adopts an exact C2-symmetric conformation about a crystallographic twofold axis. See Seidel, Goddard, Nöthling & Lehmann [Acta Cryst. (2016), C72, 753-757].

research papers


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A new strontium germanate, SrGe2O5, was crystallized at 6 GPa and 1223 K. The effect of cation size on the crystal structure is discussed in terms of bonding nature.

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In the solvated salt derived from 2,4-di­chloro­phenol, tert-butyl­amine, 2,6-di­chloro­phenol and tetrahydrofuran, five components, namely two tert-butylammonium cations, one 2,4-dichlorophenol molecule, one 2,4-dichlorophenolate anion and one 2,6-dichloro­phenolate anion, are bound by N—H⋯O and O—H⋯O hydrogen bonds to form a hydrogen-bonded ring with the graph-set motif R_{5}^{3}(10), which is further associated with two pendant tetra­hydro­furan solvent mol­ecules by N—H⋯O hydrogen bonds. The hydrogen-bonded ring has inter­nal symmetry, with a twofold axis running through the centre of the 2,6-di­chloro­phenolate anion, and is isostructural with a previous structure.

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Two new transition metal complexes, namely [Co(L)0.5(IPA)(H2O)]n and [Cd(L)0.5(IPA)(H2O)]n (L is 1,4-bis­{[1-(pyridin-3-ylmeth­yl)-1H-benz[d]imidazol-2-yl]meth­oxy}benzene and IPA is isophthalate), have been constructed by a symmetric N-donor ligand and a carboxyl­ate ligand under hydro­thermal conditions. An X-ray crystallographic study reveals that the complexes are isostructural, with both exhibiting a three-dimensional supra­molecular architecture built by hydrogen bonds.

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The organic salt formed by transfer of a proton between tropolone and iso­butyl­amine has been studied by crystallographic, computational, and statistical methods, revealing an extensive hydrogen-bonding network but a surprising absence of the π-mediated inter­actions that characterize many other troponoid-based crystals.

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The crystal structure of the bis­(quinoline) adduct dihydrate of tris­(tryptaminium 3,5-di­nitro­benzoate) shows an extensively hydrogen-bonded and π–π-bonded one-dimensional columnar extension.

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The crystal structure of 7-ethyl-10-hy­droxy­camptothecin monohydrate suggests that the hydrogen-bond network around the water mol­ecule and the lactone ring promotes the hydrolysis reaction in the crystal.

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The 1:1 cocrystal of 1,4-diethynyl­benzene with 1,3-di­acetyl­benzene and the 1:1 cocrystal of 1,4-diethynyl­benzene with benzene-1,4-dicarbaldehyde feature a strong nonconventional ethyn­yl–carbonyl sp-C—H⋯O hydrogen bond between the components.

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Acetic anhydride is a widely used acetyl­ation reagent in organic synthesis. The crystal and mol­ecular structure, as determined by single-crystal X-ray analysis at 100 K, is reported for the first time. The mol­ecule adopts an exact C2-symmetric conformation about a crystallographic twofold axis.

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Crystallization experiments with the dinuclear chelate ring complex di-μ-chlorido-bis­[(η2-2-allyl-4-meth­oxy-5-{[(propan-2-yl­oxy)carbon­yl]meth­oxy}phenyl-κC1)platinum(II)] using five different conditions has resulted in four different complexes.

book reviews


Special and virtual issues

Acta Crystallographica Section C is planning special issues on

NMR Crystallography

Scorpionates: a golden anniversary

Full details are available on the special issues page.

The latest virtual issue features Coordination polymers, with an introduction by Len Barbour.

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

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