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ISSN: 2414-3146

October 2020 issue

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Cover illustration: Polycyclic cage hydro­carbons act as valuable synthons in pharmaceutical and medicinal chemistry and are also useful candidates in energetic materials. Most of the cage systems display functions in supra­molecular chemistry and asymmetric catalysis. Oxygenated cage compounds show significant biological activity. The crystal structure of the meth­oxy-substituted Cookson's dione derivative, 7-meth­oxy­penta­cyclo­[5.4.0.02,6.03,10.05,9]undecane-8,11-dione, C12H12O3, at 150 K has monoclinic (P21/c) symmetry. The penta­cyclo­undecane cage compound is composed of four five-membered rings, a planar four-membered ring and a six-membered ring in a boat conformation fused into a closed strained-cage framework. All of the five-membered rings adopt an envelope conformation. A slight distortion is observed after substitution with a meth­oxy group compared to Cookson's dione skeleton. See: Kotha, Ansari & Cheekatla [IUCrData (2020). 5, x201380].

inorganic compounds


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Al2.95Cr0.59 was synthesized by high-pressure sinter­ing (HPS). It has a slightly lower Al content than the closely related η-Al11Cr2 phase.

metal-organic compounds


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The crystal structure of [Pb3(C4H7O2)6(H2O)2]n was redetermined, revealing details of the disorder of one of the hydro­carbon chains in one of the six independent 2-methyl­propano­ate anions.

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The coordination of the ZnII central atom in the title complex, [Zn(C15H10ClN3)(NO3)2], exists in a distorted trigonal bipyramidal geometry defined by the nitro­gen atoms of the 4-chloro­terpyridine ligand and two monodentate nitrate groups.

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In the structure of the title compound, [CdCl2(C3H5NS2)3]n, the CdII atom is coordinated by three S and three Cl atoms in a mer arrangement.

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The title CuII complex shows the typical Jahn–Teller distortion of the octa­hedral coordination sphere, defined by the N atoms of a 4,4′-dimeth­oxy-2,2′-bi­pyridine and two aceto­nitrile ligands in the equatorial plane and two O atoms of tri­fluoro­methane­sulfonate anions in the elongated axial positions.

organic compounds


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The title mol­ecule is essentially flat; in the crystal the mol­ecules are linked by a system of hydrogen bonds formed by the hydrazido group and consisting of chains of fused rings.

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The mol­ecular structure of pyridine-4-carboxamidoxime N-oxide is presented, which gives a two-dimensional supra­molecular crystal structure.

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The crystal structure of a meth­oxy-substituted Cookson's dione derivative is presented.

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In the crystal of the title compound, mol­ecules are linked by C—H⋯O hydrogen bonds and a C—H⋯π inter­action, forming a supra­molecular framework.

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The title compound is nearly planar with a dihedral angle between the aromatic rings of 1.41 (8)°. The phenolic O atom is deprotonated and the N atom of the azomethine unit carries the proton, thereby forming an intra­molecular N—H⋯O hydrogen bond. In the crystal, the mol­ecules form inversion dimers via pairwise O—H⋯O hydrogen bonds.

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The title compound features a twisted, tetra-substituted pyrrolidine ring, and has an N-bound ethyl­carboxyl­ate substituent with the N atom flanked by a methyl­ene group on one side and a C-bound 4-meth­oxy­phenyl group on the other. These carbon atoms are linked by two methine carbon atoms, each of which bears an acet­yloxy substituent.
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