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ISSN: 2414-3146

February 2022 issue

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Cover illustration: Bis[1,2-bis­(4-chloro­phen­yl)­ethyl­ene-1,2-dithiol­ato(1−)]nickel(II) crystallizes as pairs of mol­ecules related by an inversion center at the bc face of the cell with close inter­molecular C—H⋯S (2.884 Å) and C—H⋯Ni contacts (3.032 Å) that are less than the sum of the van der Waals radii and which appear to induce slight bowing of the mol­ecular planes toward one another. The angles at which the four p-ClC6H4- rings join the NiS2C2 chelate rings [39.37 (9)– 53.41 (6)°] are similarly influenced by these inter­molecular contacts. In the larger packing arrangement, sheets of mol­ecules extend in the direction of the ac face diagonal. See: Koehne, Mirmelli, Mague & Donahue [IUCrData (2022). 7, x220148].

metal-organic compounds


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The reaction of AgNO3 with the ligand 2,2′,2′′,2′′′-{[pyrazine-2,3,5,6-tetra­yltetra­kis­(methyl­ene)]tetra­kis­(sulfanedi­yl)}tetra­acetic acid, in the presence of a potassium acetate buffer, lead to the formation of a silver(I)–potassium–organic framework.

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The title compound exhibits typical PtIV—S bond lengths. The packing of the complexes enable inter­molecular inter­actions between the qdt ligands (qdt = quinoxaline-2,3-di­thiol­ate) and an amine hydrogen atom (hydrogen bonding) or other qdt ligands (π–π stacking).

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Bis[1,2-bis­(4-chloro­phen­yl)­ethyl­ene-1,2-dithiol­ato(1−)]nickel(II) crystallizes as pairs of mol­ecules related by an inversion center with close inter­molecular C—H⋯S and C—H⋯Ni contacts.

organic compounds


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In the crystal, the mol­ecules are linked by O—H⋯O and N—H⋯O hydrogen bonds into a three-dimensional network.

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The asymmetric unit of the title compound contains two almost identical mol­ecules, which have approximate D2 symmetry. They show a largely twisted double bond, the mol­ecular halves enclosing dihedral angles of 62.86 (4) and 61.22 (3)°.

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The components of the title mol­ecular salt are linked by N—H⋯O and O—H⋯O hydrogen bonds.

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The packing of the title compound is consolidated by C—H⋯O inter­actions.

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This new triazole-functionalized phospho­nic acid, PTEPHCl, was synthesized by the `click' reaction of the alkyl azide diethyl-(2-azido­eth­yl)phospho­nate with phenyl­acetyl­ene to give the dieth­yl[2-(4-phenyl-1H-1,2,3-triazol-1-yl)eth­yl]phospho­nate ester, which was then hydrolyzed under acidic conditions (HCl) to give the `free' phospho­nic acid. The use of HCl for the hydrolysis caused protonation of the triazole ring, rendering the compound cationic, charged-balanced by a Cl anion.

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The title compound is more planar than its 3-nitro isomer in the solid state and differs in its hydrogen-bonding pattern.
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