metal-organic compounds
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In the title molecular salt, (C10H16N2)[CoCl4], the piperazine ring of the phenylpiperazine dication adopts a chair conformation and the phenyl ring occupies an equatorial orientation. In the tetrachloridocobaltate(II) dianion, the Co—Cl bond lengths for the chloride ions not accepting hydrogen bonds are significantly shorter than those for the chloride ions accepting such bonds. In the crystal, the components are linked by N—HCl hydrogen bonds, generating [001] chains.
metal-organic compounds
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In the title complex, [Co(C6H15N2)Cl3], the Co2+ ion is coordinated in a distorted tetrahedral fashion by three chloride ions and one N atom of the piperazine ring; the ring adopts a chair conformation with the N—Co and N—CEt bonds in equatorial orientations. In the crystal, molecules are connected by N—HCl hydrogen bonds, generating (10-1) sheets.
research communications
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The crystal structures of the title compounds are compared, showing molecular parameters that reflect the relative steric pressure of their respective phosphine ligands. Their supramolecular properties are distinct but in both cases are organized around short C—HO contacts involving the acetyl ligands.
research communications
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The title compounds exhibit remarkably similar structures although they are not isomorphous. In the crystal of the sulfur analogue, molecules are linked via C—HS hydrogen bonds, forming chains along [001], while in the crystal of the selenium analogue, there are no C—HSe hydrogen bonds present.
organic compounds
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In the title compound, C13H10N2O4, the nitro groups are twisted significantly relative to the benzene rings [dihedral angles = 16.64 (18) and 28.02 (11)°]. The benzene groups are nearly perpendicular to each other [dihedral angle = 87.72 (6)°]. Short intermolecular NO and CO [2.981 (2) and 3.060 (2) Å, respectively] contacts suggest possible weak π-interactions between nitro groups and between benzene and nitro groups. In addition, there are π–π interactions between one benzene group and an inversion-related equivalent [interplanar separation = 3.494 (2) Å].
Keywords: crystal structure.
data reports
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The crystal structure of the title salt, C8H12N+·C4H3O4−, consists of a 2,5-dimethylanilinium cation and an hydrogen maleate anion. In the anion, a strong intramolecular O—HO hydrogen bond is observed, leading to an S(7) graph-set motif. In the crystal, the cations and anions pack in alternating layers parallel to (001). The ammonium group undergoes intermolecular N—HO hydrogen-bonding interactions with the O atoms of three different hydrogen maleate anions. This results in the formation of ribbons extending parallel to [010] with hydrogen-bonding motifs of the types R44(12) and R44(18).