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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—H...Cl hydrogen bonds, generating [001] chains.

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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—H...Cl hydrogen bonds, generating (10-1) sheets.

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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—H...O contacts involving the acetyl ligands.

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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—H...S hydrogen bonds, forming chains along [001], while in the crystal of the selenium analogue, there are no C—H...Se hydrogen bonds present.

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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 N...O and C...O [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].

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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—H...O 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—H...O 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).
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