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Journal logoIUCrDATA
ISSN: 2414-3146

August 2020 issue

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Cover illustration: 1,2,3-Selena­diazo­les are synthesized from SeO2-oxidation of semicarbazones and are important inter­mediates for the synthesis of medium-sized, heterocyclic and strained cyclo­alkynes. The centrosymmetric crystal structure of rac-12-selena-13,14-di­aza­tri­cyclo­[9.3.0.02,4]tetra­deca-11,13-diene is built up from alternating strands of (R,R)- and (S,S)-enanti­omers. These strands, which propagate along the c-axis direction, are composed of homochiral mol­ecules related to each other by twofold screw axes. The shape of the mol­ecule is an almost planar unit around the selena­diazole ring with a hexa­methyl­ene chain as an arched handle.See: Detert & Schollmeyer [IUCrData (2020). 5, x201081].

metal-organic compounds


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The crystal structure of racemic di­chloro­[2,2′-bis­(di­phenyl­phosphino)-1,1′-binaphth­yl]platinum(II) has been determined at 150 K. The asymmetric unit consists of a single mol­ecule of the title compound co-crystallized with three aceto­nitrile solvent mol­ecules.

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In the title coordination compound, the metal ion is bonded to two monodentate carboxyl­ate groups and four water mol­ecules.

organic compounds


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The title compound crystallizes with two mol­ecules in the asymmetric unit. In the crystal, asymmetric, bifurcated N—H⋯(N,O) hydrogen bonds link the mol­ecules into [100] chains. The packing is consolidated by weak C—H⋯O inter­actions.

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The centrosymmetric crystal structure of the title compound, is built up from alternating strands of (R,R)- and (S,S)-enanti­omers. These strands, which propagate along the c-axis direction, are composed of homochiral mol­ecules related to each other by twofold screw axes. The shape of the mol­ecule is an almost planar unit around the selena­diazole ring with a hexa­methyl­ene chain as an arched handle.

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The title compound was isolated from fruits of Zanthoxylum leprieurii. The atoms of the three rings of the mol­ecule are coplanar. In the crystal, C—H⋯·O hydrogen-bonding inter­actions link the mol­ecules into a three-dimensional network.

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In the title compound, the nitro groups are rotated significantly out of the plane of the benzene ring and the amine group forms a bifurcated N—H⋯(O,O) hydrogen bond with intra­molecular and inter­molecular components.
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