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Journal logoSTRUCTURAL
ISSN: 2053-2296

May 2015 issue

Highlighted illustration

Cover illustration: A centrosymmetric TeII complex supported by ditelluridoimidodiphosphinate ligands has been structurally characterized. This compound is the first all-tellurium member of a series of related square-planar EII(E')4 complexes (E and E' are group 16 elements). See Chivers & Ritch [Acta Cryst. (2015), C71, 407-409].

research papers

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In the title compound, each of the R- and S-isomers are stacked into columns by C—H⋯O=C hydrogen bonds between the benzene rings and the carbonyl groups. The columns of one enantio­mer are connected with the counterpart isomeric columns by C—H⋯F hydrogen bonds between the meth­oxy groups and the F atom of the aroyl groups to yield a stripe structure.

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Three symmetrically independent complex molecules have a similar conformation, with two chelating Me2tn (2,2-dimethylpropane-1,3-diamine) ligands in an anti conformation coordinating a CrIII centre in the equatorial plane, and two Br atoms in the axial positions of a distorted octahedron. The packing is stabilized by hydrogen bonds between the amino groups of the Me2tn ligands as donors and the Br ligands and perchlorate counter-ion O atoms as acceptors.

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4,4′-Bipyridine-1,1′-diium acetylenedicarboxylate, a one-dimensional structure with alternating cations and anions, is a new member of the (H2bipy)[Cu(ox)2] family reported earlier. The supramolecular isostructurality is ascribed to the synergistic effect of multiple interactions in the structures, including strong charge-assisted N—H⋯O hydrogen bonds, C—H⋯O contacts and π–π interactions.

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1-Aryl-5-chloro-3-methyl-1H-pyrazole-4-carbaldehydes react with cyclo­hexyl­amine by nucleophilic substitution when the aryl substituent is pyridin-2-yl to give 5-cyclo­hexyl­amino-3-methyl-1-(pyridin-2-yl)-1H-pyrazole-4-carbaldehyde, and by condensation followed by hydrolysis when the aryl substituent is phenyl to give (Z)-4-[(cyclo­hexyl­amino)­methyl­idene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one.

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A novel two-dimensional cadmium(II) coordination polymer is composed of one-dimensional [Cd3(e,e-trans-1,4-chdc)2(4-PyBIm)2(H2O)2]n chains [4-PyBIm is 2-(pyridin-4-yl)-1H-benz­imidazole and 1,4-chdc2− is cyclo­hexane-1,4-di­carb­oxy­late] joined by e,a-cis-1,4-chdc2− ligands.

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Di­hydrogen phosphate anions show a supra­molecular flexibility depending on the nature of the cations and may be suitable for the design of the host lattice for host–guest supra­molecular systems. In the salt 1-methyl­piperazine-1,4-diium bis­(di­hydrogen phosphate) and the solvated salt 2-(pyridin-2-yl)pyridinium di­hydrogen phosphate–ortho­phosphoric acid (1/1), the formation of O—H⋯O and N—H⋯O hydrogen bonds between the di­hydrogen phosphate anions and the cations constructs a three- and two-dimensional anionic–cationic network, respectively.

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The structure of (2-aminopyrimidine-κN1)aqua(pyridine-2,6-dicarboxylato-κ3O2,N,O6)copper(II) is compared with three similar previously reported compounds. Close Cu⋯Xbridged (X = N or O) contacts are present between potentially ligating atoms from neighbouring molecules and the CuII centre. Bond-order indices have been employed to elucidate the degree of covalency in these interactions and its implications for the effective coordination number of the transition metal atom.

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Crystal structures are reported for a new polymorph of the drug niclosamide, together with acetone and acetonitrile solvates and the monohydrate polymorph HA.

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Mol­ecules of a substituted β-D-uridine are assembled by N—H⋯O and O—H⋯O hydrogen bonds into well-separated two-dimensional layers of about 15 Å thickness. The crescent conformation of the mol­ecules is stabilized by weak intra­molecular C—H⋯O and C—H⋯F hydrogen bonds. The endocyclic uracil bond lengths imply a considerable degree of delocalization of the electron density within the ribo­furan­ose ring.

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A centrosymmetric TeII complex supported by ditelluridoimidodiphosphinate ligands has been structurally characterized. This compound is the first all-tellurium member of a series of related square-planar EII(E′)4 complexes (E and E′ are group 16 elements).

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All known 4-(2,4,6-triiso­propyl­benzo­yl)benzoate salts are photochemically active in the crystalline state. The lack of photochemical reactivity for the sodium salt is explained on the basis of inter­molecular inter­actions and the mol­ecular geometry in the crystals.

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The new potential NLO (nonlinear optical) material L-argininium phosphite was obtained from a 1:1 solution of L-arginine and phospho­rous acid. The composition of the product obtained from the 1:2 solution is proposed on the basis of spectroscopic data.

addenda and errata

Acta Cryst. (2015). C71, 422
doi: 10.1107/S2053229615005598
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Corrigenda for four articles.

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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